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Abstract

Both repeated practice and sleep improve long-term retention of information. The assumed common mechanism underlying these effects is memory reactivation, either on-line and effortful or off-line and effortless. In the study reported here, we investigated whether sleep-dependent memory consolidation could help to save practice time during relearning. During two sessions occurring 12 hr apart, 40 participants practiced foreign vocabulary until they reached a perfect level of performance. Half of them learned in the morning and relearned in the evening of a single day. The other half learned in the evening of one day, slept, and then relearned in the morning of the next day. Their retention was assessed 1 week later and 6 months later. We found that interleaving sleep between learning sessions not only reduced the amount of practice needed by half but also ensured much better long-term retention. Sleeping after learning is definitely a good strategy, but sleeping between two learning sessions is a better strategy.

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... A remarkable 38% of U.S. adolescents believe they must cheat to succeed (Gentina et al., 2017), and a significant association emerges between access to such technologies (Hamlen, 2012;Trushell et al., 2013) and academic iCheating. Alhola and Polo-Kantola (2007) revealed that sleep deprivation affects cognitive performance, long-term memory, and decision-making (Mazza et al., 2016). To combat their stress and test anxiety, Gen Z students with a high level of nomophobia, who suffer sleep disturbances, naturally turn to their smartphones for relief, which leads to iCheating. ...
... Teachers and parents should tap viral marketing strategies, through Facebook, Instagram, Twitter, and Snapchat, to encourage ethical behaviors and create positive contagion. Educational institutions, parents, and public policy makers must understand the dark sides of nomophobia, so that they can establish expectations for proper usage that help adolescents avoid overdependence, take back control of their lives, enhance learning and memory, ensure long-term retention of materials (Mazza et al., 2016), and prevent iCheating. Experts should help parents and their adolescents use smartphones properly; positive influences and susceptible members among peers also should be identified (Aral & Walker, 2012), so that adolescents' emotional intelligence can be channeled into creative, pro-social, ethical behaviors rather than iCheating. ...
... The effect is often attributed to sleep-associated memory consolidation, assuming that memory contents are reactivated during certain sleep stages, which strengthens and stabilizes them (for reviews, see Rasch & Born, 2013;Stickgold, 2013). Although research on prolonged retention intervals is scarce, some studies reported sleep benefits also after longer delay than just 12 hours (e.g., Gais, Lucas, & Born, 2006;Griessenberger et al., 2012;Mazza et al., 2016;Stickgold, James, Hobson, 2000;Wagner, Hallschmid, Rasch, & Born, 2006; but see Schönauer, Grätsch, & Gais, 2015), suggesting that sleep-associated memory consolidation can have a long-lasting influence on remembering. ...
... This holds while there is not an abundance of studies examining how long-lasting such sleep benefits really are. A few studies investigated the issue and reported sleep benefits across delays that go beyond 12-h intervals (Gais et al., 2006;Griessenberger et al., 2012;Mazza et al., 2016;Talamini et al., 2008;Stickgold et al., 2000;Wagner et al., 2006), which is why initially we expected long-lasting sleep effects in our experiments, too (see above). The results of Experiments 2a and 2b of the present study show a different picture, however. ...
Article
Retrieval practice relative to restudy of learned material typically attenuates time-dependent forgetting. A recent study examining this testing effect across 12-h delays filled with nocturnal sleep versus daytime wakefulness, however, showed that sleep directly following encoding benefited recall of restudied but not of retrieval practiced items, which reduced, and even eliminated, the testing effect after sleep (Bäuml, Holterman, & Abel, 2014). The present study investigated in 4 experiments, whether this modulating role of sleep for the testing effect is influenced by two factors that have previously been shown to increase the testing effect: corrective feedback and prolonged retention intervals. Experiments 1a and 1b applied 12-h delays and showed benefits of sleep for recall after both restudy and retrieval practice with feedback, but not after retrieval practice without feedback. Experiments 2a and 2b applied 24-h or 7-day delays and failed to observe any long-lasting benefits of sleep directly after encoding, on both restudied and retrieval practiced items. These results indicate that both corrective feedback and prolonged retention intervals reduce the modulating role of sleep for the testing effect as it can be observed after 12-h delays and in the absence of corrective feedback, which suggests a fairly limited influence of sleep on the effect.
... Ainsi, il semblerait que plus l'espacement entre deux sessions de révision est important et plus ces éléments contextuels seront divers et nombreux pour participer favorablement au processus de récupération des connaissances lors d'un examen differential storage en anglais ; Bjork & Allen, 1970;Emilie Gerbier, 2011). Enfin, dans le cas d'espacement de l'ordre d'un jour, le bénéfice du sommeil a été avancé dans le processus de consolidation des connaissances, mais cette piste reste peu étudiée à ce jour pour en tirer des conclusions claires (Frankland & Bontempi, 2005;Mazza et al., 2016). Tout comme l'usage de l'apprentissage par récupération en mémoire, la promotion de cette méthode de planification des révisions ne cesse d'être faite auprès des enseignants et des étudiants par le biais de plusieurs canaux ; Vidéos de vulgarisation par la chaîne Osmose 20 ). ...
Thesis
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L’apprentissage scolaire implique généralement une phase d’étude des cours suivie d'une phase d’évaluation pour mesurer l'efficacité de la première. Dans cette conception, la phase de test sert à quantifier la réussite de l’apprentissage mais n’est pas envisagée comme outil d’apprentissage. Pourtant, de nombreuses études ont montré l’importance des tests comme processus actif pour consolider des connaissances à long terme. Une autre pratique peu utilisée est la distribution d’un même apprentissage dans le temps. Alors que le bachotage favorise la mémorisation à court terme, l’espacement des révisions favorise la consolidation sur le long terme. A l’heure actuelle, ces méthodes sont méconnues des enseignants et des élèves alors que les bénéfices de l’entrainement par récupération en mémoire et de l’espacement ont été répliqués de manière robuste avec des populations et contenus variés. La start-up Didask a créé la plate-forme d’enseignement numérique du même nom en incorporant les résultats de ces recherches menées sur l’apprentissage. En collaboration avec Didask, ma thèse s’est articulée autour de la problématique suivante : quel est l’agencement optimal des phases de récupération en mémoire par rapport à la présentation des contenus d’un cours ? Le premier chapitre est une introduction générale pour contextualiser cette recherche. Le second chapitre compile les résultats de trois méta-analyses portant sur l’effet de l’apprentissage avec tests répétés et espacés dans le temps. La première méta-analyse a montré un bénéfice significatif de l’apprentissage avec tests espacés dans le temps sur la rétention en mémoire par rapport à l’apprentissage avec tests massés dans le temps (g = 0.74). La seconde méta-analyse suggère en revanche un bénéfice non significatif de l’apprentissage avec tests espacés par rapport à l’apprentissage avec relectures espacées dans le temps (g=0.46). La dernière méta-analyse n’a pas démontré de différence entre un planning expansif d’apprentissage avec tests espacés (accroissement progressif de l’intervalle de temps entre les sessions d’apprentissage) et un planning uniforme (maintien du même intervalle entre les sessions, g = 0.032). L’ensemble de ces résultats confirme le net avantage de l’apprentissage avec tests espacés dans le temps, mais le planning d’espacement optimal n’est pas nécessairement expansif. Les chapitres 3, 4, et 5 présentent trois expérimentations menées sur Didask. L’objectif était de mesurer les bénéfices de différents emplacements et planning de tests d’apprentissage sur la rétention en mémoire une semaine à un mois après la session d’apprentissage. Les résultats de l’Expérience 1 ont démontré qu’il est préférable de faire des tests d’apprentissage après la lecture du cours pour une meilleure mémorisation plutôt qu’avant. De plus, l’avantage de faire des tests après la lecture du cours était observé sur les informations non testées lors de l’apprentissage. Les résultats de l’Expérience 2 indiquent que le degré de granularité des contenus importe lors de l’apprentissage par relectures successives : un découpage fin permet une meilleure mémorisation qu’un découpage plus grossier. Par contre, l’importance de la granularité disparait dans la condition avec des tests d’apprentissage. Enfin, l’Expérience 3 a répliqué l’effet de récupération en mémoire mais pas l’effet d’espacement. Contrairement aux hypothèses de départ, l’effet de la combinaison des deux stratégies d’apprentissage n’était pas significatif. Néanmoins, l’apprentissage avec tests espacés permettait en moyenne une meilleure mémorisation que l’apprentissage avec tests massés, avec relectures espacées, et avec relectures massées dans le temps. Les résultats de cette thèse apportent une meilleure compréhension sur la manière d’utiliser l’apprentissage par les tests. Ils suggèrent également de nouvelles pistes de recherche sur l’optimisation des apprentissages pour promouvoir la consolidation de nouvelles connaissances.
... This suggests that the newly learned lexical items were temporarily stored in the hippocampus and became re-represented in cortical areas after sleep, which is in line with predictions from McClelland's complementary learning systems account. In addition to offline gains in the absence of further practice, sleep between two periods of practice in word learning can benefit long-term retention of novel words (Mazza et al., 2016), and even daytime naps or short periods of sleep can improve or stabilize learning of tasks, including word learning (Lahl et al., 2008;Heim et al., 2017). The extant literature shows clear benefits of sleep for word learning; however, of interest to the current chapter is whether similar findings are also observed in speech learning. ...
Book
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Please check, the book is open access and you can download all papers. https://www.peterlang.com/view/title/64900
... After the initial acquisition and consolidation of a task, memories can be modified and strengthened through further experiences [27]. In fact, it is well known that extensive repetitive practice of a task is important for the retention of knowledge [28]. However, it is not known if these changes in the memory strength depend on the same cellular and molecular mechanisms. ...
Article
The endocannabinoid system is capable of modulating multiple physiological brain functions including learning and memory. Moreover, there is evidence that the processes of acquisition and consolidation have distinct biological basis. We used the cannabinoid agonist WIN 55,212-2 (WIN-2) to investigate whether chronic CB1 activation affects acquisition and consolidation differently by evaluating gene expression in the hippocampus (HIP) and prefrontal cortex (PFC). Swiss mice were treated with WIN-2 (2mg/kg) and submitted to the Morris water maze to evaluate different aspects of memory. We observed short-term memory impairment in acquisition of the spatial task while consolidation remained unchanged. In the PFC, animals that received WIN-2 prior to the task exhibited increased expression of the 2-AG synthesis enzyme diacylglycerol lipase and decreased levels of the degradation enzyme monoacylglycerol lipase, while mice that were treated after the task for the evaluation of consolidation exhibited the opposite profile. With respect to genes related to AEA metabolism, no correlation between the molecular and behavioral data could be established. In this sense, the cognitive impairment in the acquisition promoted by WIN-2 treatment may be related to a possible increase in the concentration of 2-AG in the PFC. Overall, this study confirms the relevance of the endocannabinoid system in the modulation of cognitive processes. A better understanding of the mechanisms underlying endocannabinoids roles in cognition could provide guidance for the development of treatments to reduce the cognitive deficits caused by drug abuse.
... Intriguingly, this formation of long-term memory that is facilitated by sleep has very persistent effects. Effects of immediate sleep versus initial wakefulness after learning on subsequent recognition performance have been demonstrated to last for several months in case of neutral visual stimuli (Takashima et al., 2006) or word pairs (Mazza et al., 2016) and even for 4 years in case of emotional text (Wagner et al., 2006). These long-lasting consequences of may be highly relevant for insomnia disorder with its key characteristic of sleep fragmentation by arousals, especially during REM sleep (Merica et al., 1998;Perlis et al., 2001;Feige et al., 2008;Riemann et al., 2012). ...
Article
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Studies suggest that sleep supports persistent changes in the neuronal representation of emotional experiences such that they are remembered better and less distressful when recalled than when they were first experienced. It is conceivable that sleep fragmentation by arousals, a key characteristic of insomnia disorder, could hamper the downregulation of distress. In this study, we sought further support for the idea that insomnia disorder may involve a lasting deficiency to downregulate emotional distress. We used functional MRI in insomnia disorder (n = 27) and normal sleepers (n = 30) to identify how brain activation differs between novel and relived self-conscious emotions. We evaluated whether brain activity elicited by reliving emotional memories from the distant past resembles the activity elicited by novel emotional experiences more in insomnia disorder than in normal sleepers. Limbic areas were activated during novel shameful experiences as compared to neutral experiences in both normal sleepers and insomnia disorder. In normal sleepers, reliving of shameful experiences from the past did not elicit a limbic response. In contrast, participants with insomnia disorder recruited overlapping parts of the limbic circuit, in particular the dorsal anterior cingulate cortex, during both new and relived shameful experiences. The differential activity patterns with new and old emotions in normal sleepers suggest that reactivation of the long-term memory trace does not recruit the limbic circuit. The overlap of activations in insomnia disorder is in line with the hypothesis that the disorder involves a deficiency to dissociate the limbic circuit from the emotional memory trace. Moreover, the findings provide further support for a role of the anterior cingulate cortex in insomnia.
... While the nap benefited memory, our protocol was not intended to determine whether consolidation, encoding, or some combination of these processes was responsible. Learning materials from pre-nap blocks may have been preferentially strengthened, stabilized [1][2][3][4]6 , and reorganized in order to promote subsequent relearning 18 . Encoding of information in post-nap learning blocks may have also benefited from the nap, since naps can restore encoding capacity 8,9 . ...
Article
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Study objectives Daytime naps benefit long-term memory relative to taking a break and remaining awake. However, the use of naps as a practical way to improve learning has not been examined, in particular, how memory following a nap compares with spending the equivalent amount of time cramming. Methods Young adults learned detailed factual knowledge in sessions that flanked one-hour spent napping (n=27), taking a break (n=27), or cramming that information (n=30). Recall was examined 30-mins and one week after learning. Results When tested 30-mins after learning, cramming and napping led to significantly better memory than taking a break. After a week, napping maintained this significant advantage, but cramming did not. Conclusions These findings demonstrate the longer-term benefits of napping for retention of memoranda akin to what students encounter daily, and encourage more widespread adoption of napping in education.
... In contrast, contingencies that increase conscious processing (e.g., pressure) among performers at cognitive and associative stages of acquisition may enhance performance (e.g., Beilock, Carr, MacMahon, & Starkes, 2002;Gray, 2004;Malhotra, Poolton, Wilson, Omuro, & Masters, 2015). In addition to extending the acquisition phase, future studies could also introduce a period of sleep consolidation, which has been argued to further automatize skills (e.g., Mazza et al., 2016;Walker & Stickgold, 2006), prior to delayed retention and pressure tests. Delayed retention tests in particular would allow assessment of the extent to which participants truly learned the sequence, rather than their proficiency at acquiring and memorizing it in a single day, as we tested here. ...
Preprint
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This study was designed to test the theorized link between reinvestment, motor chunks, and conscious processing, to provide a thorough examination of reinvestment theory. The authors measured electroencephalographic power and connectivity alongside self-reported conscious processing and behavioral indices of chunking in a 2 (group) × 5 (block) mixed-model design. A total of 55 individuals acquired a motor sequence (blocks A1, A2, A3, and A4) by relatively explicit (errorful) or implicit (errorless) paradigms. Then they performed in a pressure condition (block T). Results confirmed that chunking characterizes both modes of acquisition. However, explicit acquisition resulted in quicker chunking, reduced conscious processing, and increased cortical efficiency (left-temporal high-alpha power). In support of reinvestment theory, self-reported conscious processing tended to increase under pressure among explicit trainees only. In contrast to reinvestment theory, this had no adverse effect on performance. The results endorse explicit acquisition as an effective mode of training and provide a new neurophysiological explanation of this phenomenon.
... Sleeping after learning is definitely a good strategy. However, we recently showed that relearn after sleep significantly enhances memory performances [98]. We recently showed that interleaving sleep between learning and relearning sessions reduced significantly the amount of practice needed to relearn while ensuring increased long-term retention. ...
Article
Numerous studies have explored the effect of sleep on memory. It is well known that a period of sleep, compared to a similar period of wakefulness, protects memories from interference, improves performance, and might also reorganize memory traces in a way that encourages creativity and rule extraction. It is assumed that these benefits come from the reactivation of brain networks, mainly involving the hippocampal structure, as well as from their synchronization with neocortical networks during sleep, thereby underpinning sleep-dependent memory consolidation and reorganization. However, this memory reorganization is difficult to explain within classical memory models. The present paper aims to describe whether the influence of sleep on memory could be explained using a multiple trace memory model that is consistent with the concept of embodied cognition: the Act-In (activation-integration) memory model. We propose an original approach to the results observed in sleep research on the basis of two simple mechanisms, namely activation and integration.
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Thesis
La pédagogie Montessori est une méthode d’éducation qui a été mise au point au début du siècle dernier par Maria Montessori pour des enfants d’un quartier défavorisé de Rome en Italie. Depuis sa création, elle s’est développée à la marge de l’éducation nationale et se retrouve principalement dans des écoles privées. La pédagogie Montessori devient cependant de plus en plus populaire auprès des enseignants de l’école maternelle publique. Ce récent engouement apparaît fondé à la vue de plusieurs principes de cette méthode. En effet, elle promeut l’autonomie, l’auto-régulation, la coopération entre pairs d’âges variés et l’apprentissage à partir de matériels sensoriels et auto-correctifs. Ces caractéristiques sont plutôt en accord avec les connaissances scientifiques sur l’apprentissage et le développement de l’enfant. Cependant, à ce jour, les preuves expérimentales rigoureuses de son efficacité sont limitées. Dans cette thèse, nous avons mesuré les compétences langagières, mathématiques, exécutives et sociales d’enfants d’une école maternelle, repartis aléatoirement entre des classes appliquant la pédagogie Montessori ou une pédagogie conventionnelle. Nous avons suivi leurs progrès au cours des trois années de l’école maternelle (étude longitudinale) et avons comparé les performances des enfants en fin de Grande Section (étude transversale). Nous avons également élaboré une mesure pour évaluer objectivement la qualité d’implémentation de la pédagogie Montessori dans cette école, situé dans un quartier défavorisé. Nos résultats ne montrent pas de différences entre les groupes dans les domaines des mathématiques, des compétences exécutives et des compétences sociales. Cependant, les enfants issus des classes Montessori avaient de meilleures performances en lecture que les enfants issus des classes conventionnelles en fin de Grande Section. La pédagogie Montessori apparaît donc comme adaptée à l’apprentissage de la lecture chez le jeune enfant
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Chapter
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Converging evidence and new research methodologies from across the neurosciences permit the neuroscientific study of the role of sleep in off-line memory reprocessing, as well as the nature and function of dreaming. Evidence supports a role for sleep in the consolidation of an array of learning and memory tasks. In addition, new methodologies allow the experimental manipulation of dream content at sleep onset, permitting an objective and scientific study of this dream formation and a renewed search for the possible functions of dreaming and the biological processes subserving it.
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Traditional theories of forgetting are wedded to the notion that cue-overload interference procedures (often involving the A-B, A-C list-learning paradigm) capture the most important elements of forgetting in everyday life. However, findings from a century of work in psychology, psychopharmacology, and neuroscience converge on the notion that such procedures may pertain mainly to forgetting in the laboratory and that everyday forgetting is attributable to an altogether different form of interference. According to this idea, recently formed memories that have not yet had a chance to consolidate are vulnerable to the interfering force of mental activity and memory formation (even if the interfering activity is not similar to the previously learned material). This account helps to explain why sleep, alcohol, and benzodiazepines all improve memory for a recently learned list, and it is consistent with recent work on the variables that affect the induction and maintenance of long-term potentiation in the hippocampus.
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The authors performed a meta-analysis of the distributed practice effect to illuminate the effects of temporal variables that have been neglected in previous reviews. This review found 839 assessments of distributed practice in 317 experiments located in 184 articles. Effects of spacing (consecutive massed presentations vs. spaced learning episodes) and lag (less spaced vs. more spaced learning episodes) were examined, as were expanding interstudy interval (ISI) effects. Analyses suggest that ISI and retention interval operate jointly to affect final-test retention; specifically, the ISI producing maximal retention increased as retention interval increased. Areas needing future research and theoretical implications are discussed.
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Learning is often considered complete when a student can produce the correct answer to a question. In our research, students in one condition learned foreign language vocabulary words in the standard paradigm of repeated study-test trials. In three other conditions, once a student had correctly produced the vocabulary item, it was repeatedly studied but dropped from further testing, repeatedly tested but dropped from further study, or dropped from both study and test. Repeated studying after learning had no effect on delayed recall, but repeated testing produced a large positive effect. In addition, students' predictions of their performance were uncorrelated with actual performance. The results demonstrate the critical role of retrieval practice in consolidating learning and show that even university students seem unaware of this fact.
Chapter
Publisher Summary This chapter reviews the research on the effects of repetition conducted in the laboratory. Repetition is one of the most powerful variables affecting memory. The chapter discusses experiments called the “method of memory judgments.” In this technique, a list of items is presented, and the subject is then presented with each test item and asked to judge from memory some aspect of its presentation in the list. Judgments of recency, frequency, exposure duration, list membership, input modality, spacing, and serial position have all been used, singly and in combination. Judgments reveal much more about the richness of information encoded in memory than can be inferred from more traditional recall and recognition measures. Memory judgments have been particularly revealing where effects of repetition on memory are concerned. The chapter examines how frequency or number of occurrences is represented in memory. It reviews research on effects on memory of the spacing of repetitions and presents evidence on the role of repetitions as retrieval cues.
Article
To download the paper : http://www.sciencedirect.com/science/article/pii/S2211949315000022 Education ideally should induce learning that lasts for years and more. A wealth of research indicates that, to achieve long-lasting retention, information must be practiced and/or tested repeatedly, with repeated practice well distributed over time. In this paper we discuss the behavioral, neuroimaging and neurophysiological findings related to the effect of distributed practice and testing as well as the resulting theoretical accounts. Distributed practice and testing appear to be powerful learning tools. We consider implications of these learning principles for educational practice.
Article
The focus here is on Ebbinghaus’s sole measure of retention: savings during relearning. The article is divided into four sections: (a) the historical perspective surrounding Ebbinghaus’s use of savings and relearning (including a fundamental difference between Ebbinghaus’s conception of memory and that of his contemporaries such as William James), (b) potential problems with savings as a measure of retention, (c) recent findings based on savings and relearning, and (d) applications of savings and relearning.
Article
Over more than a century of research has established the fact that sleep benefits the retention of memory. In this review we aim to comprehensively cover the field of "sleep and memory" research by providing a historical perspective on concepts and a discussion of more recent key findings. Whereas initial theories posed a passive role for sleep enhancing memories by protecting them from interfering stimuli, current theories highlight an active role for sleep in which memories undergo a process of system consolidation during sleep. Whereas older research concentrated on the role of rapid-eye-movement (REM) sleep, recent work has revealed the importance of slow-wave sleep (SWS) for memory consolidation and also enlightened some of the underlying electrophysiological, neurochemical, and genetic mechanisms, as well as developmental aspects in these processes. Specifically, newer findings characterize sleep as a brain state optimizing memory consolidation, in opposition to the waking brain being optimized for encoding of memories. Consolidation originates from reactivation of recently encoded neuronal memory representations, which occur during SWS and transform respective representations for integration into long-term memory. Ensuing REM sleep may stabilize transformed memories. While elaborated with respect to hippocampus-dependent memories, the concept of an active redistribution of memory representations from networks serving as temporary store into long-term stores might hold also for non-hippocampus-dependent memory, and even for nonneuronal, i.e., immunological memories, giving rise to the idea that the offline consolidation of memory during sleep represents a principle of long-term memory formation established in quite different physiological systems.
Article
Many studies have shown that memory is enhanced when study sessions are spaced apart rather than massed. This spacing effect has been shown to have a lasting benefit to long-term memory when the study phase session follows the encoding session by 24 hours. Using a spacing paradigm we examined the impact of sleep and spacing gaps on long-term declarative memory for Swahili-English word pairs by including four spacing delay gaps (massed, 12 hours same-day, 12 hours overnight, and 24 hours). Results showed that a 12-hour spacing gap that includes sleep promotes long-term memory retention similar to the 24-hour gap. The findings support the importance of sleep to the long-term benefit of the spacing effect.
Article
The brain does not retain all the information it encodes in a day. Much is forgotten, and of those memories retained, their subsequent evolution can follow any of a number of pathways. Emerging data makes clear that sleep is a compelling candidate for performing many of these operations. But how does the sleeping brain know which information to preserve and which to forget? What should sleep do with that information it chooses to keep? For information that is retained, sleep can integrate it into existing memory networks, look for common patterns and distill overarching rules, or simply stabilize and strengthen the memory exactly as it was learned. We suggest such 'memory triage' lies at the heart of a sleep-dependent memory processing system that selects new information, in a discriminatory manner, and assimilates it into the brain's vast armamentarium of evolving knowledge, helping guide each organism through its own, unique life.
Article
The literature on spacing effects is vast, but no prior research has examined the effects of initial spacing when students learn to criterion and then subsequently relearn items. In addition, minimal research has evaluated the costs associated with spaced practice as well as the benefits. Accordingly, in the current research, we examined the benefits and costs of initial spacing using Bahrick's (1979) method of successive relearning. Across 3 experiments, 567 students practiced key term definitions via test-restudy practice until items were correctly recalled 1 or 3 times during initial learning. Practice trials during initial learning were either massed or spaced (including relatively longer lags in all experiments as well as intermediate lags in Experiment 1). All students then relearned items in 2-3 subsequent relearning sessions (across experiments, almost 40,000 short-answer recall responses were collected and hand scored). The benefits of initial spacing were measured by interim cued recall tests and a final test administered days or weeks after relearning, and costs were measured by total practice time across sessions. A consistent qualitative pattern emerged: The benefits of initial spacing were substantial prior to relearning but were significantly attenuated after relearning. Moreover, the costs associated with achieving criterion via spaced practice during initial learning were also substantially attenuated by faster relearning in subsequent sessions. (PsycINFO Database Record (c) 2012 APA, all rights reserved).
Article
Performed 2 experiments in an attempt to relate sleep stages with overnight memory of consonant trigrams and paired-associates. In Exp I a 20-min learning task before sleep did not alter sleep patterns of 14 high school and university students. Further, neither delta sleep nor REM sleep nor their interaction reliabily correlated with recall in the morning. In Exp II the effect of pharmacological alteration of the sleep pattern with imipramine hydrochloride was assessed in 8 medical students. Despite a large suppression of REM sleep and concomitant elevation of Stage 2, recall and relearning in the morning were not different from non-drug values. Results indicate that no sleep stage is uniquely favorable or unfavorable to verbal memory. (23 ref) (PsycINFO Database Record (c) 2012 APA, all rights reserved)
Article
Used 2 methods—successive relearning and cross-sectional adjustment—to examine processes involved in the maintenance of knowledge. Successive relearning is illustrated in a laboratory study with 90 undergraduates; English–Spanish word pairs were periodically relearned, and the intersession interval was varied from a few seconds to 30 days. It was found that indefinite access to the acquired information remained highly probable if the retraining interval did not exceed the access interval. Cross-sectional adjustment is a nonlaboratory method designed to investigate the acquisition and maintenance of complex knowledge systems under ecologically realistic conditions. The method is illustrated in a study with 275 university students and 576 alumni in which maintenance of knowledge of a city was found to be related to the frequency, recency, duration, and distribution of visits during a 46-yr retention interval. Statistical and interpretive procedures for each method are detailed. (9 ref) (PsycINFO Database Record (c) 2012 APA, all rights reserved)
Article
The retrieval of a memory places it into a plastic state, the result of which is that the memory can be disrupted or even enhanced by experimental treatment. This phenomenon has been conceptualised within a framework of memories being reactivated and then reconsolidated in repeated rounds of cellular processing. The reconsolidation phase has been seized upon as crucial for the understanding of memory stability and, more recently, as a potential therapeutic target in the treatment of disorders such as post-traumatic stress and drug addiction. However, little is known about the reactivation process, or what might be the adaptive function of retrieval-induced plasticity. Reconsolidation has long been proposed to mediate memory updating, but only recently has this hypothesis been supported experimentally. Here, the adaptive function of memory reconsolidation is explored in more detail, with a strong emphasis on its role in updating memories to maintain their relevance.
Article
Memories are dynamic, rather than static, in nature. The reactivation of a memory through re-exposure to salient training stimuli results in its destabilization, necessitating a restabilization process known as reconsolidation, a disruption of which leads to amnesia. I found that one normal function of hippocampal memory reconsolidation in rats is to modify the strength of a contextual-fear memory as a result of further learning.
Article
Retention of nonsense syllables was tested in two groups of Ss: those having initial learning in the morning and those having initial learning at night immediately before sleep. These groups were subdivided so that recall was tested either 8 or 24 hrs after initial learning. As Jenkins and Dallenbach first demonstrated, retention was superior after 8 hrs for Ss when learned at night compared to those who learned in the morning. Retention with night learning was equal after 24 hrs to that observed after 8 hrs. Surprisingly, retention scores after morning learning were superior after 24 hrs to those observed after 8 hrs. Some possible interpretations of this result are advanced.
Article
Eight subjects were kept awake and active overnight in a sleep lab isolated from environmental time cues. Ambulatory EEG and EOG were continuously recorded and sleepiness ratings carried out every two hours as was a short EEG test session with eyes open for 5 min and closed for 2 min. The EEG was subjected to spectral analysis and the EOG was visually scored for slow rolling eye movements (SEM). Intrusions of SEM and of alpha and theta power density during waking, open-eyed activity strongly differentiated between high and low subjective sleepiness (the differentiation was poorer for closed eyes) and the mean intraindividual correlations between subjective and objective sleepiness were very high. Still, the covariation was curvilinear; physiological indices of sleepiness did not occur reliably until subjective perceptions fell between "sleepy" and "extremely sleepy-fighting sleep"; i.e. physiological changes due to sleepiness are not likely to occur until extreme sleepiness is encountered. The results support the notion that ambulatory EEG/EOG changes may be used to quantify sleepiness.
Article
Despite the prevalence of sleep complaints among psychiatric patients, few questionnaires have been specifically designed to measure sleep quality in clinical populations. The Pittsburgh Sleep Quality Index (PSQI) is a self-rated questionnaire which assesses sleep quality and disturbances over a 1-month time interval. Nineteen individual items generate seven "component" scores: subjective sleep quality, sleep latency, sleep duration, habitual sleep efficiency, sleep disturbances, use of sleeping medication, and daytime dysfunction. The sum of scores for these seven components yields one global score. Clinical and clinimetric properties of the PSQI were assessed over an 18-month period with "good" sleepers (healthy subjects, n = 52) and "poor" sleepers (depressed patients, n = 54; sleep-disorder patients, n = 62). Acceptable measures of internal homogeneity, consistency (test-retest reliability), and validity were obtained. A global PSQI score greater than 5 yielded a diagnostic sensitivity of 89.6% and specificity of 86.5% (kappa = 0.75, p less than 0.001) in distinguishing good and poor sleepers. The clinimetric and clinical properties of the PSQI suggest its utility both in psychiatric clinical practice and research activities.
Article
The focus here is on Ebbinghaus's sole measure of retention: savings during relearning. The article is divided into four sections: (a) the historical perspective surrounding Ebbinghaus's use of savings and relearning (including a fundamental difference between Ebbinghaus's conception of memory and that of his contemporaries such as William James), (b) potential problems with savings as a measure of retention, (c) recent findings based on savings and relearning, and (d) applications of savings and relearning.
Article
Consolidation is the progressive postacquisition stabilization of long-term memory. The term is commonly used to refer to two types of processes: synaptic consolidation, which is accomplished within the first minutes to hours after learning and occurs in all memory systems studied so far; and system consolidation, which takes much longer, and in which memories that are initially dependent upon the hippocampus undergo reorganization and may become hippocampal-independent. The textbook account of consolidation is that for any item in memory, consolidation starts and ends just once. Recently, a heated debate has been revitalized on whether this is indeed the case, or, alternatively, whether memories become labile and must undergo some form of renewed consolidation every time they are activated. This debate focuses attention on fundamental issues concerning the nature of the memory trace, its maturation, persistence, retrievability, and modifiability.
Article
In rats, the firing sequences observed in hippocampal ensembles during spatial learning are replayed during subsequent sleep, suggesting a role for posttraining sleep periods in the offline processing of spatial memories. Here, using regional cerebral blood flow measurements, we show that, in humans, hippocampal areas that are activated during route learning in a virtual town are likewise activated during subsequent slow wave sleep. Most importantly, we found that the amount of hippocampal activity expressed during slow wave sleep positively correlates with the improvement of performance in route retrieval on the next day. These findings suggest that learning-dependent modulation in hippocampal activity during human sleep reflects the offline processing of recent episodic and spatial memory traces, which eventually leads to the plastic changes underlying the subsequent improvement in performance.