Daytime naps improve procedural motor memory
ABSTRACT To investigate the impact of a short daytime nap on procedural and declarative memory consolidation.
Following a normal night's sleep, 34 young healthy subjects were randomly assigned to a nap or wake condition of about 45min in the early afternoon after learning procedural and declarative memory tasks. Subjects were controlled for alertness and cortisol secretion.
The afternoon naps were dominated by sleep stage 2 but contained some slow wave sleep (SWS) and rapid eye movement (REM) sleep as well. Naps significantly improved procedural, but not declarative, memory. Females showed more improvement than males in the declarative memory tasks irrespective of nap or wake. There was no difference between groups with respect to cortisol secretion or alertness.
A short nap is favorable for consolidation of procedural memory. The possibly confounding effect of gender should always be considered in research on sleep and memory.
- SourceAvailable from: Mohd Amzari Tumiran
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- "In adolescence especially, midday napping is helpful in reinforcing declarative memory (Tucker et al. 2006). However, the study by Backhaus and Junghanns (2006) found that procedural memory, but not declarative memory, of 34 young healthy subjects aged 18-25 years old can be reinforced significantly through napping (Backhaus and Junghanns 2006). Napping also seemed to be more beneficial throughout early life in consolidating procedural memory (Schabus et al. 2004; Rasch et al. 2007; Wilhelm et al. 2008; Backhaus et al. 2008; Prehn-Kristensen et al. 2009). "
ABSTRACT: Napping/siesta during the day is a phenomenon, which is widely practised in the world. However, the timing, frequency, and duration may vary. The basis of napping is also diverse, but it is mainly done for improvement in alertness and general well-being. Neuroscience reveals that midday napping improves memory, enhances alertness, boosts wakefulness and performance, and recovers certain qualities of lost night sleep. Interestingly, Islam, the religion of the Muslims, advocates midday napping primarily because it was a practice preferred by Prophet Muhammad (pbuh). The objectives of this review were to investigate and compare identical key points on focused topic from both neuroscientific and Islamic perspectives and make recommendations for future researches.Journal of Religion and Health 08/2015; DOI:10.1007/s10943-015-0093-7 · 1.02 Impact Factor
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- "In line with this reasoning, other procedural tasks previously studied in children and having found time-more than sleep-dependent effects actually mostly benefit from REM and/or light non-REM (stage 2) sleep in adults. For instance, post-training sleep spindle density was associated with the consolidation of motor and visuomotor learning (Fogel et al., 2007; Peters et al., 2008; Smith and MacNeill, 1994) whereas REM nocturnal sleep (Fogel et al., 2007) and diurnal stage 2 sleep were related to the development of mirror tracing abilities (Backhaus and Junghanns, 2006). Also, it should be considered that adaptive visuo-motor consolidation processes might be qualitatively different between children and adults. "
ABSTRACT: Cognitive impairments are often associated with abnormal sleep activity in developmental disorders and pathologies of childhood. Beside, accumulated evidence indicates that post-training sleep benefits to the consolidation of recently learned information in healthy adults and children. Although sleep-dependent consolidation effects in children are clearly established for declarative memories, they remain more debated in the procedural memory domain. Nowadays, recent experimental data suggest close interactions between the development of sleep-dependent plasticity markers, cortical maturation and cognition in children. In the present review, we propose that studying sleep and memory consolidation processes in developmental disorders and acquired childhood pathologies can provide novel, enlightening clues to understand the pathophysiological mechanisms subtending the disruption of long-term cerebral plasticity processes eventually leading to cognitive and learning deficits in children.International journal of psychophysiology: official journal of the International Organization of Psychophysiology 06/2013; 89(2). DOI:10.1016/j.ijpsycho.2013.06.022 · 2.65 Impact Factor
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- "Some studies suggest that spindles (Gais, Mölle, Helms, & Born, 2002; Genzel, Dresler, Wehrle, Grözinger , & Steiger, 2009; Meier-Koll, Bussmann, Schmidt, & Neuschwander, 1999; Schabus et al., 2004; van der Helm, Gujar, Nishida, & Walker, 2011) and delta waves (Wamsley, Tucker, Payne, & Stickgold, 2010) during S2 might be relevant to the consolidation of declarative memories. However, most investigations on the memory functions of S2 point to a role of S2 in the consolidation of procedural motor memories – i.e., nondeclarative memories (Backhaus & Junghanns, 2006; Genzel et al., 2009; Smith & Macneill, 1994). Performing new procedural motor tasks before going to sleep increases not only the amount of time spent in S2 (Fogel & Smith, 2006; Fogel, Smith, & Cote, 2007) but also the spindle density in S2 (Fogel & Smith, 2006; Fogel et al., 2007; Peters, Ray, Smith, & Smith, 2008). "
ABSTRACT: Various studies suggest that non-rapid eye movement (NREM) sleep, especially slow-wave sleep (SWS), is vital to the consolidation of declarative memories. However, sleep stage 2 (S2), which is the other NREM sleep stage besides SWS, has gained only little attention. The current study investigated whether S2 during an afternoon nap contributes to the consolidation of declarative memories. Participants learned associations between faces and cities prior to a brief nap. A cued recall test was administered before and following the nap. Spindle, delta and slow oscillation activity was recorded during S2 in the nap following learning and in a control nap. Increases in spindle activity, delta activity, and slow oscillation activity in S2 in the nap following learning compared to the control nap were associated with enhanced retention of face-city associations. Furthermore, spindles tended to occur more frequently during up-states than down-states within slow oscillations during S2 following learning versus S2 of the control nap. These findings suggest that spindles, delta waves, and slow oscillations might promote memory consolidation not only during SWS, as shown earlier, but also during S2.Neuropsychologia 06/2012; 50(10):2389-96. DOI:10.1016/j.neuropsychologia.2012.06.008 · 3.45 Impact Factor