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Articles 1 - 5 of 5
Full-Text Articles in Entire DC Network
The Effects Of Category Overlap On Information-Integration And Rule-Based Category Learning, Shawn W. Ell, Gregory F. Ashby
The Effects Of Category Overlap On Information-Integration And Rule-Based Category Learning, Shawn W. Ell, Gregory F. Ashby
Psychology Faculty Scholarship
Three experiments investigate whether the amount of category overlap constrains the decision strategies used in category learning, and whether such constraints depend on the type of category structures used. Experiments 1 and 2 used a category learning task requiring perceptual integration of information from multiple dimensions (information-integration task) and Experiment 3 used a task requiring the application of an explicit strategy (rule-based task). In the information-integration task, participants used perceptual-integration strategies at moderate levels of category overlap, but explicit strategies at extreme levels of overlap – even when such strategies were sub-optimal. In contrast, in the rule-based task, participants used …
Girl Formation Vol2 No2 (Spring-Summer 2006), Girl Formation Staff
Girl Formation Vol2 No2 (Spring-Summer 2006), Girl Formation Staff
Maine Women's Publications - All
No abstract provided.
Girl Formation Vol2 No2 (Spring-Summer 2006), Girl Formation Staff
Girl Formation Vol2 No2 (Spring-Summer 2006), Girl Formation Staff
Maine Women's Publications - All
No abstract provided.
Focal Putamen Lesions Impair Learning In Rule-Based, But Not Information-Integration Categorization Tasks, Shawn W. Ell, Natalie L. Marchant, Richard B. Ivry
Focal Putamen Lesions Impair Learning In Rule-Based, But Not Information-Integration Categorization Tasks, Shawn W. Ell, Natalie L. Marchant, Richard B. Ivry
Psychology Faculty Scholarship
Previous research on the role of the basal ganglia in category learning has focused on patients with Parkinson’s and Huntington’s Disease, neurodegenerative diseases frequently accompanied by additional cortical pathology. The goal of the present study was to extend this work to patients with basal ganglia lesions due to stroke, asking if similar changes in performance would be observed in patients with more focal pathology. Patients with basal ganglia lesions centered in the putamen (6 left side, 1 right side) were tested on rule-based and information-integration visual categorization tasks. In rule-based tasks, it is assumed that participants can learn the category …
Homocysteine, Folate, And Vitamins B6 And B12 Blood Levels In Relation To Cognitive Performance: The Maine-Syracuse Study, Merrill F. Elias, Michael A. Robbins, Marc M. Budge, Penelope K. Elias, Suzanne L. Brennan, Carole Johnston, Zsuzsanna Nagy, Christopher J. Bates
Homocysteine, Folate, And Vitamins B6 And B12 Blood Levels In Relation To Cognitive Performance: The Maine-Syracuse Study, Merrill F. Elias, Michael A. Robbins, Marc M. Budge, Penelope K. Elias, Suzanne L. Brennan, Carole Johnston, Zsuzsanna Nagy, Christopher J. Bates
Maine-Syracuse Longitudinal Papers
Objective: Our objective was to examine associations among plasma homocysteine concentrations (tHcy), the tHcy-cofactors (folate, vitamins B6 and B12), and multiple domains of cognitive performance, with statistical adjustment for possible confounds, including cardiovascular disease risk factors (CVD-RF) and cardiovascular disease (CVD). Methods: Subjects were 812 partici- pants (58% women) of the Maine-Syracuse study who were free of dementia and stroke. Employing a cross-sectional design and multiple regression analyses, fasting concentrations of tHcy and its vitamin cofactors (folate, B6, and B12) were related to multiple domains of cognitive performance. Results: With adjustment for age, education, gender, ethnicity, and the …