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Abstract

Notwithstanding its well‐established role on high‐demanding spatial navigation tasks during adulthood, the effect of field dependence–independence during the acquisition of spatial navigation skills is almost unknown. This study assessed for the first time the effect of field dependence–independence on topographical learning (TL) across the life span: 195 individuals, including 54 healthy young‐adults (age‐range = 20–30), 46 teenagers (age‐range = 11–14), and 95 children (age‐range = 6–9) participated in this study. Field dependence–independence interacted with age in predicting TL. Also during childhood higher field independence was associated with better performances but not later in the life, that is, during adolescence and adulthood. This result suggests that field dependence–independence may have a role in fostering the acquisition of TL.

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... Instead of replicating the sequence by tapping blocks as in the CBT, the sequence is demonstrated and replicated using a pattern of squares placed on the floor and walking between them. Previous research has suggested that the WalCT has also been able to detect deficits in navigational memory, even when no deficits in other aspects of VSM are present [9,11,17,18]. When used together, the CBT and WalCT allow visuo-spatial memory to be assessed and compared within both a peri-personal and vista space setting [9,11,14,15,[18][19][20][21][22]. ...
... Previous research has suggested that the WalCT has also been able to detect deficits in navigational memory, even when no deficits in other aspects of VSM are present [9,11,17,18]. When used together, the CBT and WalCT allow visuo-spatial memory to be assessed and compared within both a peri-personal and vista space setting [9,11,14,15,[18][19][20][21][22]. This provides a more comprehensive understanding of visual spatial memory function to be determined compared to that using the CBT in isolation. ...
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Dual-task activities are essential within everyday life, requiring visual-spatial memory (VSM) and mobility skills. Navigational memory is an important component of VSM needed to carry out everyday activities, but this is often not included in traditional tests such as the Corsi block tapping test (CBT). The Walking Corsi Test (WalCT) allows both VSM and navigational memory to be tested together, as well as allowing measures of gait to be collected, thus providing a more complete understanding of dual-task function. The aim of this study was to investigate the effect of an increasingly complex cognitive task on gait in a healthy adult population, using the WalCT and body-worn inertial measurement unit (IMU) sensors. Participants completed both the CBT and WalCT, where they were asked to replicate increasingly complex sequences until they were no longer able to carry this out correctly. IMU sensors were worn on the shins throughout the WalCT to assess changes in gait as task complexity increased. Results showed that there were significant differences in several gait parameters between completing a relatively simple cognitive task and completing a complex task. The type of memory used also appeared to have an impact on some gait variables. This indicates that even within a healthy population, gait is affected by cognitive task complexity, which may limit function in everyday dual-task activities.
... Among external factors, there are environment configuration, landmarks visual accessibility, circulation systems, and sign age [5][6]. Differently, between internal factors, there are: the individual's inclination to capture some environmental information rather than others (field dependence/independence: [7][8][9][10][11]), gender ( [12][13][14][15][16][17][18][19]), age ( [20][21][22][23][24][25]`, familiarity with the environment and job-related expertise ( [4,[26][27][28][29][30][31][32][33]). Internal factors can also include the navigational strategies that the individual prefers to use to navigate. ...
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Background: Military pilots show high visuo-spatial skills. Previous studies demonstrate that they are better in mental rotating a target, in taking different perspectives, in estimating distances, in travel planning and in topographic memory. Here, we compared navigational cognitive styles between military pilots and people without flight experience. Pilots were expected to be more survey users than non-pilots, showing higher navigational strategies. Method: 106 jet military pilots of Italian Air Force and 92 non-pilots were enrolled in order to investigate group differences in navigational styles. Participants were asked to perform a reduced version of the Spatial Cognitive Style Test – SCST, consisting of six tasks that allow to distinguish individuals in landmark (people orient themselves by using a figurative memory for environmental objects), route (people use an egocentric representation of the space) and survey (people have a map-like representation of the space) users. Results: In line with our hypothesis, military pilots mainly adopt a survey style, whereas non-pilots mainly adopt the route style. In addition, pilots outperformed non pilots in both the 3D-Rotation task and Map Description Task. Conclusion: Military flight expertise influences some aspects of the spatial ability, leading to enhance human navigation. Although, it must be considered that they are a population whose navigational skills were already high at the time of selection at the academy before formal training began.
... Among the external factors are environmental configuration, landmark visual accessibility, circulation systems and signage [5,6]. In contrast, internal factors include the individual's inclination to capture some environmental information instead of other (field dependence/independence [7][8][9][10][11]), gender [12][13][14][15][16][17][18][19], age [20][21][22][23][24][25], familiarity with the environment and job-related expertise [4,[26][27][28][29][30][31][32][33]. Internal factors can also include the navigational strategies that the individual prefers to use to navigate. ...
Article
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Background: Military pilots show advanced visuospatial skills. Previous studies demonstrate that they are better at mentally rotating a target, taking different perspectives, estimating distances and planning travel and have a topographic memory. Here, we compared navigational cognitive styles between military pilots and people without flight experience. Pilots were expected to be more survey-style users than nonpilots, showing more advanced navigational strategies. Method: A total of 106 military jet pilots from the Italian Air Force and 92 nonpilots from the general population matched for education with the pilots were enrolled to investigate group differences in navigational styles. The participants were asked to perform a reduced version of the Spatial Cognitive Style Test (SCST), consisting of six tasks that allow us to distinguish individuals in terms of landmark (people orient themselves by using a figurative memory for environmental objects), route (people use an egocentric representation of the space) and survey (people have a map-like representation of the space) user styles. Results: In line with our hypothesis, military pilots mainly adopt the survey style, whereas nonpilots mainly adopt the route style. In addition, pilots outperformed nonpilots in both the 3D Rotation Task and Map Description Task. Conclusions: Military flight expertise influences some aspects of spatial ability, leading to enhanced human navigation. However, it must be considered that they are a population whose navigational skills were already high at the time of selection at the academy before formal training began.
... Specifically, we hypothesized that FI cognitive style (Witkin 1950) would reduce the encoding alignment effect as assessed by the VR-WalCT (Nori et al. 2015a;Nori et al. 2015b): FI individuals are usually more accurate and faster in perspective-taking tasks (Boccia et al. 2016;Boccia et al. 2019), due to the well-documented ability to rely on an internal frame of reference to cope with cognitive restructuring (i.e., disembedding and perspectivism). In other words, we hypothesized that FI cognitive style predicts better performance in the VR-WalCT task, especially when spatial updating is required, namely, when the spatial positions must be retrieved from a different perspective of a remote encoding path. ...
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Field independence (FI) is the extent to which a person perceives part of a field as discrete from the surrounding field rather than embedded in the field. Several studies proposed that it represents a cognitive style that is a relatively stable individuals' predisposition towards information processing. This study investigated the effects of Field Independence/Field Dependence (FI/FD) cognitive style on topographic memory in a virtual environment. Seventy-nine college students completed the Embedded Figure Test as a measure of FI/FD cognitive style and learned two paths in the VR-Walking Corsi Test apparatus. After the learning phase, participants had to reproduce the paths from a familiar perspective or unfamiliar perspectives. Data showed that FI cognitive style predicted the ability to reproduce a path from unfamiliar perspectives, suggesting a different impact of the angle degree. Results are discussed considering the facilitation of body axes references and the increasing difficulty due to maintaining online perspectives with higher angle degrees that increase the visuo-spatial working memory cognitive load. These results support the idea that FI predicts human navigation.
... Environment learning is known to relate to visuospatial abilities (Hegarty et al., 2006) already at 5-6 years old (e.g., Purser et al., 2012Purser et al., , 2015Merrill et al., 2016;Thomas et al., 2016). For example, 6-year-olds' performance in the Walking Corsi Test (WalCT) was found related to individual visuospatial skills, such as fieldindependent cognitive style (Boccia et al., 2019); and, when the squares were identified using images of landmarks, performance related to verbal abilities, such as grammar comprehension (Piccardi et al., 2015). The few studies on individuals with DS (Davis et al., 2014;Farran et al., 2015;Purser et al., 2015) found that their environment learning (especially in reproducing a path) was related to their visuospatial reasoning [measured with Raven's colored progressive matrixes [CPM; Raven et al., 1998]] and other cognitive abilities (executive control, attention and memory). ...
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Analyzing navigational abilities and related aspects in individuals with Down syndrome (DS) is of considerable interest because of its relevance to everyday life. This study investigates path learning, the conditions favoring it, and the cognitive abilities involved. A group of 30 adults with DS and 32 typically-developing (TD) children matched on receptive vocabulary were shown a 4 × 4 Floor Matrix and asked to repeat increasingly long sequences of steps by walking on the grid. The sequences were presented under two learning conditions, one called Oral instructions (participants received verbal instructions such as “turn right” or “turn left”), the other Observation (participants watched the experimenter's moves). Participants were also assessed on verbal and visuospatial cognitive measures. The results showed a similarly better performance in both groups when the Floor Matrix task was administered in the Observation as opposed to the Oral instructions condition. As for the relation with cognitive abilities, in the Floor Matrix task in the Oral instructions condition, individuals with DS showed an effect of both verbal and visuospatial abilities, which was only positive for verbal ability. The effect of verbal and visuospatial abilities was negligible in the TD group. In the Observation condition, performance was predicted by sequential working memory in both groups. Overall, these results shed light on path learning in individuals with DS, showing that they benefited from the Observation condition, and that the involvement of their cognitive abilities depended on the learning condition.
... The WalCT is thus presented in a vista space setting (i.e., the space can be visually experienced from a single location, Montello, 1993) and, unlike classical VSWM tasks, it requires whole-body movements within this controlled space (see Piccardi et al., 2008; 2019; see also Barhorst-Cates, 2019;Klencklen et al., 2017;Mitolo et al., 2015 for a similar setting). This task has been designed to be usedcombined with the classical CBTto examine individual differences in visuo-spatial memory with different scales of space in experimental conditions (e.g., Boccia et al., 2019b;Palmiero et al., 2015;Palmiero & Piccardi, 2017;Piccardi et al., 2008;2019;Verde et al., 2015). It is also used in clinical practice (see Piccardi et al., 2013) to detect navigational memory impairments in clinical populations with no other visuo-spatial memory deficits, e.g., in brain damaged patients (see Piccardi et al., 2010;, or individuals with developmental topographical disorientation (see Bianchini et al., 2010). ...
Article
This study newly assessed visuo-spatial working memory (VSWM) in young and older adults with an extended version of the backward Corsi Blocks Task (CBT): the backward Walking Corsi Test (WalCT). It involves recalling sequences of spatial locations while moving in an indoor space (2.5 × 3m) in which the CBT layout is recreated on the floor. The specific contribution of the backward WalCT (beyond that of the backward CBT) to explaining age-related effects on spatial rotation abilities was explored. Seventy young adults and 56 older adults performed the backward WalCT, classic VSWM tasks, self-assessments on pleasure in exploring and spatial anxiety, and mental rotation and perspective-taking tasks. Mediation models for the mental rotation and perspective-taking measures showed a direct age-related effect on both the backward WalCT and backward CBT, and an indirect one on the two spatial rotation abilities, mediated by the backward WalCT and – partly – the backward CBT. In particular, age-related effects on mental rotation were explained by the backward WalCT, while those on perspective-taking were explained by both the backward WalCT and backward CBT. The backward WalCT can be considered a measure suitable for assessing VSWM in older adults, which also explains age-related effects on mental rotation and perspective-taking performance.
... Other studies found additional cognitive abilities involved in path learning (again after exploring VE), including attention, perception, memory and executive functions (Purser et al., 2012;Nys et al., 2015). There is also evidence of 6 year old performance in the WalCT being related to individual visuo-spatial factors, such as field-independent cognitive style (Boccia et al., 2019), and even verbal abilities (such as grammar comprehension, when the squares used in the WalCT are identified with images reproducing landmarks; Piccardi et al., 2015). ...
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Environment learning is essential in everyday life. In individuals with Down syndrome (DS), this skill has begun to be examined using virtual exploration. Previous studies showed that individuals with DS can learn and remember paths in terms of sequences of turns and straight stretches, albeit with some difficulty, and this learning is supported by their cognitive abilities. This study further investigates environment learning in the DS population, newly examining their ability to learn a path from actual movements, and to learn increasingly long paths, and how their performance relates to their visuo-spatial abilities and everyday spatial activities. A group of 30 individuals with DS and 30 typically-developing (TD) children matched for receptive vocabulary performed a 4 × 4 Floor Matrix task in a grid comprising 16 squares (total area 2.3 × 2.3 meters). The task involved repeating increasingly long sequences of steps by actually moving in the grid. The sequences were presented in two learning conditions, called Observation (when participants watched the experimenter’s moves), or Map (when they were shown a map reproducing the path). Several visuo-spatial measures were also administered. The results showed a clear difference between the two groups’ performance in the individual visuo-spatial measures. In the Floor Matrix task, after controlling for visuo-spatial reasoning ability, both groups benefited to the same degree from the Observation condition vis-à-vis the Map condition, and no group differences emerged. In the group with DS, visuo-spatial abilities were more predictive of performance in the Floor Matrix task in the Observation condition than in the Map condition. The same was true of the TD group, but this difference was much less clear-cut. The visuo-spatial working memory and visualization tasks were the strongest predictors of Floor Matrix task performance. Finally, the group with DS showed a significant relation between Floor Matrix task performance in the Observation condition and everyday spatial activity. These results enlarge on what we know about path learning in individuals with DS and its relation to their visuo-spatial abilities. These findings are discussed within the frame of spatial cognition and the atypical development domain.
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Objective: Several authors have proposed that the cerebellum has an important role in functions of higher order as a general mode of sequence detection, independently from the nature of the information. The aim of this study was to verify whether the cerebellum mediates the processing of navigational sequential information and to determine whether it is influenced by the modality of the stimuli presentation. Method: We tested 12 cerebellar patients and 12 healthy age-matched participants in 2 comparable navigational tasks (Walking Corsi Test and the Magic Carpet) requiring to memorizing a sequence of spatial locations. The 2 tasks differ each other for the modality of stimuli presentation: in the Walking Corsi Test the sequence is shown by an examiner that walks on the carpet, whereas in the Magic Carpet it is shown by a computer that lights up the tiles in the sequence. We hypothesize that different mental processes are implicated between the Walking Corsi Test and the Magic Carpet. Indeed, whereas watching the examiner, who performs the sequence on the carpet, allows the patient to simulate the action mentally in the Walking Corsi Test, such simulation cannot be triggered in the Magic Carpet. Results: Our results showed that cerebellar patients obtained scores significantly lower than control participants only in the Magic Carpet. Conclusions: We interpreted the patients' performance as a specific deficit in detecting and ordering single independent stimuli as a sequence, when the maintenance of stimulus-response associations is more demanding. (PsycINFO Database Record
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This study explored the relationship between cognitive styles and achievement in English as a foreign language (EFL). To this end, the Goodenough-Harris Drawing Test, consisting of draw a woman test (DAWT) and draw a man test (DAMT), was administered to 658 grade two, three and four students who had registered in Imam Reza primary schools in Mashhad, Iran. The DAWT and DAMT were marked by two raters and averaged to have a more comprehensive measure of the students’ conceptualization of human figure called draw a person test (DAPT). The mean score on the DAPT was utilized to assign the participants to field-dependent and field-independent groups. The participants’ scores on the oral and written examinations held in the middle and end of school year were also obtained from their schools and averaged to get a total test score as an indicator of EFL achievement. The correlational analysis of the data established a significant relationship between cognitive styles and oral and total EFL achievement. Neither the field-dependent nor field-independent genus of cognitive styles related to the achievement. The independent samples ttest, however, showed that the field-independent primary school students’ EFL achievement was significantly higher than their FD counterparts. The results are discussed and suggestions are made for future research.
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Field independence (FI) has been defined as the extent to which the individual perceives part of a field as discrete from the surrounding field, rather than embedded in the field. It has been proposed to represent a relatively stable pattern in individuals’ predisposition towards information processing. In the present study, we assessed the effect of FI on skills underpinning human navigation. Fifty Healthy individuals took part in this study. FI has been assessed by using the group embedded figures test (GEFT). Participants were also asked to perform several visuo-spatial orientation tasks, including the perspective taking/spatial orientation test (PTSOT), the mental rotation task (MRT) and the vividness task, as well as the Santa Barbara Sense of Direction Scale, a self-reported questionnaire, which has been found to predict environmental spatial orientation ability. We found that performances on the GEFT significantly predicted performances on the PTSOT and the MRT. This result supports the idea that FI predicts human navigation.
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In the present study we investigated the role of spatial locative comprehension in learning and retrieving pathways when landmarks were available and when they were absent in a sample of typically developing 6- to 11-year-old children. Our results show that the more proficient children are in understanding spatial locatives the more they are able to learn pathways, retrieve them after a delay and represent them on a map when landmarks are present in the environment. These findings suggest that spatial language is crucial when individuals rely on sequences of landmarks to drive their navigation towards a given goal but that it is not involved when navigational representations based on the geometrical shape of the environment or the coding of body movements are sufficient for memorizing and recalling short pathways.
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Spatial navigation is a fascinating behavior that is essential for our everyday lives. It involves nearly all sensory systems, it requires numerous parallel computations, and it engages multiple memory systems. One of the key problems in this field pertains to the question of reference frames: spatial information such as direction or distance can be coded egocentrically—relative to an observer—or allocentrically—in a reference frame independent of the observer. While many studies have associated striatal and parietal circuits with egocentric coding and entorhinal/hippocampal circuits with allocentric coding, this strict dissociation is not in line with a growing body of experimental data. In this review, we discuss some of the problems that can arise when studying the neural mechanisms that are presumed to support different spatial reference frames. We argue that the scale of space in which a navigation task takes place plays a crucial role in determining the processes that are being recruited. This has important implications, particularly for the inferences that can be made from animal studies in small scale space about the neural mechanisms supporting human spatial navigation in large (environmental) spaces. Furthermore, we argue that many of the commonly used tasks to study spatial navigation and the underlying neuronal mechanisms involve different types of reference frames, which can complicate the interpretation of neurophysiological data.
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The aim of this study was to determine whether an egocentric topographical working memory (WM) deficit is present in the early stages of Alzheimer's disease (AD) with respect to other forms of visuospatial WM. Further, we would investigate whether this deficit could be present in patients having AD without topographical disorientation (TD) signs in everyday life assessed through an informal interview to caregivers. Seven patients with AD and 20 healthy participants performed the Walking Corsi Test and the Corsi Block-Tapping Test. The former test requires memorizing a sequence of places by following a path and the latter is a well-known visuospatial memory task. Patients with AD also performed a verbal WM test to exclude the presence of general WM impairments. Preliminary results suggest that egocentric topographical WM is selectively impaired, with respect to visuospatial and verbal WM, even without TD suggesting an important role of this memory in the early stages of AD.
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How we acquire and represent spatial information is one of the most important unsolved issues in spatial cognition. Siegel and White (1975) affirmed that different forms of environmental knowledge are acquired and represented depending on the type of information selected: landmark, characterized by environmental patterns that are perceptually salient or important for the person; route, based on the pathes generally used to connect landmarks; and survey, an overall configuration of the environment, similar to a map. According to these authors, anyone can reach survey representation with extensive experience of the environment. Recently, Pazzaglia and co-workers (2000) demonstrated. that these three types of representations correspond to three different spatial cognitive styles. Conversely, according to Montello (1998) a pure landmark or route representation does not exist; indeed, during their first exposure to the environment, people acquire and represent an overall survey configuration of it. Our aim was to determine whether environmental familiarity and/or spatial cognitive style predict the way we acquire and represent spatial information. Forty participants who had different degrees of familiarity with the Italian city of Bologna took part in the experiment. Familiarity with Bologna was evaluated using a questionnaire. This city was selected because it has a small and well-defined centre that can be easily explored on foot. Participants were further subdivided by spatial cognitive style to assess its weight in environmental representation. They performed six spatial tasks concerning Bologna that measured different spatial abilities, based on Siegel and White’s frameworks (1975). We found that neither familiarity with the environment nor spatial cognitive style predict the correct solution of landmark tasks, whereas both familiarity with the environment and spatial cognitive style predict the correct solution of route and survey tasks. Thus, we can affirm that both familiarity with the environment and spatial cognitive style are important for acquiring and representing spatial information, but their involvement depends on task demands. To our knowledge, this is the first study in which knowledge of a real town has been measured. This ecological setting allowed us to propose a new model to explain individual differences in moving successfully through the environment.
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We report normative data on topographical working memory collected through the Walking Corsi Test (WalCT; Piccardi et al., 2008) for developing a standard administration procedure to be used in clinical and educational practice. A total of 268 typically developing Italian children aged 4–11 years performed both WalCT and Corsi Block-Tapping Test (CBT; Corsi, 1972) a well-known visuo-spatial memory test. WalCT has already been validated in adults, demonstrat- ing sensitivity in detecting topographical memory deficits even in individuals who have no other memory impairments. Our results showed that age, but not sex, affected performances. Both girls and boys had a larger span on the CBT than the WalCT. The youngest group did not differ in performing WalCT and CBT, but from 5.6 years of age children performed better on CBT than WalCT, suggesting that memory in reaching space develops before topographical memory. Only after 5 years of age do children learn to process specifically topographical stimuli, suggesting that this happens when their environmental knowledge becomes operational and they increase environmental independence. We also discuss the importance to introduce WalCT in the clinical assessment.
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Introduction: Mental rotation ability has an important role in human navigation and, together with other cognitive abilities such as processing speed, working memory, and attention, is crucial for aircraft navigation. In the human performance literature, mental rotation tasks have consistently yielded reports of gender differences favoring men. The aim of this study was to compare the gender difference measured in a specialized population of aviators vs. a matched population of nonpilots. Methods: : Studied were 41 pilots (20 men and 21 women) and 38 nonpilots (20 men and 18 women) matched for age and education. Pilots were stratified for flying hours. Participants performed a mental rotation task (MRT) in which accuracy and response time were recorded, and also completed sense-of-direction (SOD) and spatial cognitive styles self-evaluation scales. Results: Men had significantly smaller response time in the MRT (men 279.6 +/- 147.0 s, women 401.6 +/- 361.3) and greater SOD (men's score 49.1 +/- 8.6, women's score 46.6 +/- 7.8), but these differences were absent among pilots. A positive relationship was also identified between pilots' response times and their flight hours. Conclusion: These data suggest that the effect of gender on the speed of cognitive spatial processing is absent in a population with aviation experience. Gender effects may be associated with a low spatial cognitive style, whereas in groups such as aviators, who are expected to have high spatial cognitive style, other factors such as experience may come into play.
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The literature on sources of individual differences in field dependence-independence is reviewed, and findings on ontogenetic development and cross-cultural differences are incorporated into the theory of psychological differentiation. During the growth years, individuals develop toward greater field independence. Hormonal and X-linked genetic factors may influence development of specific cognitive components of the field-dependence-independence dimension. It is clear from a wide variety of data that the development of field independence is enhanced by appropriate training programs, child-rearing practices which encourage separation from parental authority, and "loose" social structures which permit individual autonomy. Among subsistence-level societies, members of nomadic hunting groups tend to be more field independent than members of sedentary farming groups. Viewed from an ecocultural perspective, this finding suggests a progression from relative field independence toward relative field dependence as cultural forms changed from early hunting to later agricultural economies. That developmental changes may proceed in opposite directions in the course of ontogeny and during cultural history is compatible with the bipolar conception of cognitive styles; the cognitive restructuring skills of field-independent individuals and the social-interpersonal competencies of field-dependent individuals have adaptive value in different life circumstances. (Author/MV)
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We present the case of F.G., a healthy, normally developed 22-year-old male subject affected by a pervasive disorder in environmental orientation and navigation who presents no history of neurological or psychiatric disease. A neuro-radiological examination showed no evidence of anatomical or structural alterations to the brain. We submitted the subject for a comprehensive neuropsychological assessment of the different cognitive processes involved in topographical orientation to evaluate his ability to navigate the spatial environment. The results confirmed a severe developmental topographical disorder and deficits in a number of specific cognitive processes directly or indirectly involved in navigation. The results are discussed with reference to the sole previously described case of developmental topographical disorientation (Pt1; Iaria et al., 2009). F.G. differs from the former case due to the following: the greater severity of his disorder, his complete lack of navigational skills, the failure to develop compensatory strategies, and the presence of a specific deficit in processing the spatial relationships between the parts of a whole. The present case not only confirms the existence of developmental topographical-skill disorders, but also sheds light on the architecture of topographical processes and their development in human beings.
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In an effort to further investigation into critical development facets of Geographic Information Systems (GIS), this book explores the reasoning processes that apply to geographic space and time. As a result of an iniative sponsored by the National Center for Geographic Information and Analysis (NCGIA), it treats the computational, cognitive and social science applications aspects of spatial and temporal reasoning in GIS. Essays were contributed by scholars from a broad spectrum of disciplines including: geography, cartography, surveying and engineering, computer science, mathematics and environmental and cognitive psychology.
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Short title on half-title page: Memory and the medial temporal region of the brain. Thesis (Ph. D.)--McGill University, 1972. Includes bibliographical references (leaves 69-78). Microfilm of typescript.
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The purposes of this report are to describe a design for the study of X linkage, to illustrate its application using cognitive test scores, and to offer a linkage hypothesis suggested by these data. Sixty-seven three-son families were examined for two X chromosome marker variables--red-green color vision and Xg(a) blood groups--and given a battery of cognitive tests of field dependence and spatial visualization abilities. Evidence was found to suggest that brothers who are identical in Xg(a) phenotype are more similar to each other in extent of field dependence than brothers who are different in Xg(a) phenotype. This result is tentative because of the small number of informative cases and the many linkage associations examined. If cross-validated, such a finding would be consistent with the proposition that an X chromosome gene contributes to the field dependence cognitive style.
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Sex differences are often reported in spatial abilities. However, some studies show conflicting results, which can be ascribed to the complexity of the variables involved in the visuo-spatial domain. Until a few years ago, it was widely accepted that men outperformed women on almost all spatial tasks. However, recently some studies [A. Postma, G. Jager, R.P.C. Kessels, H.P.F. Koppeschaar, J. van Honk, Sex differences for selective forms of spatial memory, Brain Cogn. 54 (2004) 24-34; D.H. McBurney, S.J.C. Gaulin, T. Devineni, C. Adams, Superior spatial memory of women: stronger evidence for the gathering hypothesis, Evol. Hum. Behav. 18 (1997) 165-174; Q. Rahman, G.D. Wilson, S. Abrahams, Sexual orientation related differences in spatial memory, J. Int. Neuropsychol. Soc. 9 (2003) 376-383] found sex differences for selective forms of spatial memory and described a female advantage in specific spatial abilities. In this paper, we studied sex differences by testing object locations and route memories with the Corsi Block-Tapping test (CBT), one of the non-verbal tasks most used in clinical settings, and its modified, large-scale version. Our results showed a performance advantage for males in both tests and a more homogeneous pattern of memory in females.
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