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91.
Contributions of the medial temporal lobe to declarative memory retrieval: manipulating the amount of contextual retrieval 下载免费PDF全文
Tendolkar I Arnold J Petersson KM Weis S Brockhaus-Dumke A van Eijndhoven P Buitelaar J Fernández G 《Learning & memory (Cold Spring Harbor, N.Y.)》2008,15(9):611-617
We investigated how the hippocampus and its adjacent mediotemporal structures contribute to contextual and noncontextual declarative memory retrieval by manipulating the amount of contextual information across two levels of the same contextual dimension in a source memory task. A first analysis identified medial temporal lobe (MTL) substructures mediating either contextual or noncontextual retrieval. A linearly weighted analysis elucidated which MTL substructures show a gradually increasing neural activity, depending on the amount of contextual information retrieved. A hippocampal engagement was found during both levels of source memory but not during item memory retrieval. The anterior MTL including the perirhinal cortex was only engaged during item memory retrieval by an activity decrease. Only the posterior parahippocampal cortex showed an activation increasing with the amount of contextual information retrieved. If one assumes a roughly linear relationship between the blood-oxygenation level-dependent (BOLD) signal and the associated cognitive process, our results suggest that the posterior parahippocampal cortex is involved in contextual retrieval on the basis of memory strength while the hippocampus processes representations of item-context binding. The anterior MTL including perirhinal cortex seems to be particularly engaged in familiarity-based item recognition. If one assumes departure from linearity, however, our results can also be explained by one-dimensional modulation of memory strength. 相似文献
92.
Helena Falkenberg Katharina Näswall Magnus Sverke Anders Sjöberg 《Journal of Occupational & Organizational Psychology》2009,82(1):45-65
Despite the amount of privatizations around the world in recent decades, only limited research attention has been paid to how privatization affects the employees. The effects are likely to vary depending on the individual's position in the organization. The aim of this study was to investigate how employees' work‐related attitudes and strain changed after privatization of a Swedish acute care hospital, and to analyze whether the effects of privatization differed between employees at various hierarchic levels. Questionnaire data collected at a hospital 1 year before and 2 years after privatization, as well as at a hospital which remained a public administration unit, suggest only limited effects of privatization on a general level, but that employees at various hierarchic levels may be affected differently. While employees at a high level (physicians) and low level (assistant nurses) reported only marginal differences over time in work attitudes and strain, also in comparison with their colleagues at the comparison hospital, work attitudes of employees at the intermediate level (registered nurses) decreased after privatization. These results emphasize the importance of taking hierarchic level into account when a privatization is implemented and analyzed. 相似文献
93.
David W. Dickins M. Aurelia Magnus S. Magnusson Carl M. Neads Lucas P. J. J. Noldus Viçenc Quera 《Behavior research methods》2000,32(2):263-268
OBSERVE is a preliminary release of a multimedia course for teaching undergraduate and graduate students how and why to study
behavior by direct observation. The instructional text and commentary and the self-test and examination materials are built
around a series of exercises in which the student observes and categorizes film clips of the behavior of several different
species in several different ways. Incorporation of elements from The Observer software for computer recording and video analysis
implements fully computerized continuous recording. At present, the text, together with check sheets that the program generates,
enables a comparison between one-zero, instantaneous, and continuous sampling of the same behavioral excerpts. Matrices are
printed out for an exercise in calculating interobserver reliability. Another section supports carrying out and writing up
a small observational project on human behavior in the field. Plans for the future development of OBSERVE are briefly described. 相似文献
94.
Magnus S. Magnusson 《Behavior research methods》2000,32(1):93-110
This article deals with the definition and detection of particular kinds of temporal patterns in behavior, which are sometimes obvious or well known, but other times difficult to detect, either directly or with standard statistical methods. Characteristics of well-known behavior patterns were abstracted and combined in order to define a scale-independent, hierarchical time pattern type, called aT-pattern. A corresponding detection algorithm was developed and implemented in a computer program, called Theme. The proposed pattern typology and detection algorithm are based on the definition and detection of a particular relationship between pairs of events in a time series, called acritical interval relation. The proposed bottom-up, level-by-level (or breadth-first) search algorithm is based on a binary tree of such relations. The algorithm first detects simpler patterns. Then, more complex and complete patterns evolve through the connection of simpler ones, pattern completeness competition, and pattern selection. Interindividual T-patterns in a quarter-hour interaction between two children are presented, showing that complex hidden T-patterns may be found by Theme in such behavioral streams. Finally, implications for studies of complexity, self-organization, and dynamic patterns are discussed. 相似文献
95.
Magnus L. Elfström Margareta Kreuter 《Journal of clinical psychology in medical settings》2006,13(1):89-100
Relations between locus of control, coping strategies and emotional well-being in persons with traumatically acquired spinal cord lesion (SCL) were examined. The sample included 132 community-residing adults. Structural equation modelling, including confirmatory factor analysis, was used. A model was hypothesized based on the transactional theory of stress and coping where coping strategies mediated the relation between locus of control and emotional well-being. The model showed acceptable fit to the data and was compared with five alternative models. The alternative models fitted the data less well or were difficult to interpret. In the preferred model, persons indicating internal control reported more coping strategies (Acceptance, Fighting spirit) related to increased well-being, whereas persons indicating external control reported a coping strategy (Social reliance) related to poorer well-being. The findings support the stress and coping framework in medical rehabilitation and illustrate why some persons need coping effectiveness training to enhance emotional adjustment. 相似文献
96.
97.
In order to clarify whether the influence of color knowledge information in object recognition depends on the presence of the appropriate surface color, we designed a name-object verification task. The relationship between color and shape information provided by the name and by the object photo was manipulated in order to assess color interference independently of shape interference. We tested three different versions for each object: typically colored, black and white, and nontypically colored. The response times on the nonmatching trials were used to measure the interference between the name and the photo. We predicted that the more similar the name and the photo are, the longer it would take to respond. Overall, the color similarity effect disappeared in the black-and-white and nontypical color conditions, suggesting that the influence of color knowledge on object recognition depends on the presence of the appropriate surface color information. 相似文献
98.
Araújo S Pacheco A Faísca L Petersson KM Reis A 《International journal of psychology》2010,45(6):443-452
One implication of the double-deficit hypothesis for dyslexia is that there should be subtypes of dyslexic readers that exhibit rapid naming deficits with or without concomitant phonological processing problems. In the current study, we investigated the validity of this hypothesis for Portuguese orthography, which is more consistent than English orthography, by exploring different cognitive profiles in a sample of dyslexic children. In particular, we were interested in identifying readers characterized by a pure rapid automatized naming deficit. We also examined whether rapid naming and phonological awareness independently account for individual differences in reading performance. We characterized the performance of dyslexic readers and a control group of normal readers matched for age on reading, visual rapid naming and phonological processing tasks. Our results suggest that there is a subgroup of dyslexic readers with intact phonological processing capacity (in terms of both accuracy and speed measures) but poor rapid naming skills. We also provide evidence for an independent association between rapid naming and reading competence in the dyslexic sample, when the effect of phonological skills was controlled. Altogether, the results are more consistent with the view that rapid naming problems in dyslexia represent a second core deficit rather than an exclusive phonological explanation for the rapid naming deficits. Furthermore, additional non-phonological processes, which subserve rapid naming performance, contribute independently to reading development. 相似文献
99.
Stenling Andreas Henning Georg Bjälkebring Pär Tafvelin Susanne Kivi Marie Johansson Boo Lindwall Magnus 《Motivation and emotion》2021,45(1):75-90
Motivation and Emotion - Drawing on self-determination theory, the present study examined how satisfaction of the basic psychological needs (autonomy, competence, and relatedness) changes across... 相似文献
100.