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INTERHEMISPHERIC COLLABORATION
DURING DUAL-TASK STIMULUS MATCHING
by
Urvi Jitendra Patel
A Dissertation Presented to the
FACULTY OF THE GRADUATE SCHOOL
UNIVERSITY OF SOUTHERN CALIFORNIA
In Partial Fulfillment of the
Requirements for the Degree
DOCTOR OF PHILOSOPHY
(PSYCHOLOGY)
December 2008
Copyright 2008 Urvi Jitendra Patel
Object Description
| Title | Interhemispheric callaboration during dual-task stimulus matching |
| Author | Patel, Urvi Jitendra |
| Author email | upatel@usc.edu; urvijp@hotmail.com |
| Degree | Doctor of Philosophy |
| Document type | Dissertation |
| Degree program | Psychology |
| School | College of Letters, Arts and Sciences |
| Date defended/completed | 2008-07-24 |
| Date submitted | 2008 |
| Restricted until | Restricted until 21 Sep. 2009. |
| Date published | 2009-09-21 |
| Advisor (committee chair) | Hellige, Joseph B. |
| Advisor (committee member) |
McClure, William Walsh, David Wilcox, Rand |
| Abstract | It is generally advantageous to spread information processing across both cerebral hemispheres as tasks become more complex. The present series of five experiments were designed to investigate whether introduction of a secondary task within a novel dual-task paradigm influences the pattern of interhemispheric collaboration without increasing the complexity of a primary comparison task. Recent research suggests that the advantage of spreading processing across both hemispheres is predicted to the extent that stimuli to be compared are likely to be processed in similar cortical pathways. To test how degree of cortical access route overlap may modulate hemispheric communication (CAR model), careful selection of primary and secondary stimulus formats was conducted.; For each of the five experiments of the present investigation, observers engaged in the following three types of conditions: (1) three-item comparison task (single primary task), (2) two-item comparison task (single secondary task), (3) three and two-item comparison task (dual-task). The critical comparison involved dual-task primary trials on which the two matching stimuli projected to the same visual field (within-hemisphere trials) versus trials on which the two matching stimuli projected to opposite visual fields (across-hemisphere trials). The results of Experiments 1 (all letters) and 2 (letters and pictures) showed support of the CAR model because an absent across-hemisphere advantage was established during the single primary task and neural overlap explained the across-hemisphere advantage found for the dual-task primary trials of the former but not the latter experiment. Experiments 3 to 5 involved a new application of the dimensions of numerical magnitude, physical size, and luminance to a dual-task paradigm. As an unexpected across-hemisphere advantage was found during the single primary task of experiments, interpretation of performance during the dual-task condition is limited. The results of Experiments 1 and 2 support the CAR model while the surprising findings of Experiments 3 to 5 do not provide an opportunity to test the model. |
| Keyword | corpus callosum; divided visual field; interhemispheric cooperation; interhemispheric interaction; interhemispheric transfer; matching task |
| Language | English |
| Part of collection | University of Southern California dissertations and theses |
| Publisher (of the original version) | University of Southern California |
| Place of publication (of the original version) | Los Angeles, California |
| Publisher (of the digital version) | University of Southern California. Libraries |
| Provenance | Electronically uploaded by the author |
| Type | texts |
| Legacy record ID | usctheses-m1612 |
| Rights | Patel, Urvi Jitendra |
| Repository name | Libraries, University of Southern California |
| Repository address | Los Angeles, California |
| Repository email | http://www.usc.edu/isd/libraries/services/ask_a_librarian/email/ |
| Filename | etd-Patel-2361 |
| Archival file | uscthesesreloadpub_Volume23/etd-Patel-2361.pdf |
Description
| Title | Page 1 |
| Full text | INTERHEMISPHERIC COLLABORATION DURING DUAL-TASK STIMULUS MATCHING by Urvi Jitendra Patel A Dissertation Presented to the FACULTY OF THE GRADUATE SCHOOL UNIVERSITY OF SOUTHERN CALIFORNIA In Partial Fulfillment of the Requirements for the Degree DOCTOR OF PHILOSOPHY (PSYCHOLOGY) December 2008 Copyright 2008 Urvi Jitendra Patel |
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