Journal
BRAIN AND COGNITION
Volume 51, Issue 1, Pages 115-142Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/S0278-2626(02)00528-6
Keywords
global and local processing; levels of processing; hemispheric asymmetries; hemispheric specialization; task demands; exposure duration; selective attention
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The experiments assess the relationship between stimulus exposure duration and hemispheric asymmetries for global and local processing. Six durations (27, 40, 53, 67, 80, and 147 ms) were tested in a selective attention task in which hierarchical letterforms were presented unilaterally to the left or right visual field. The results indicated that left hemisphere-local asymmetries were demonstrated more often than right hemisphere-global asymmetries and that asymmetries were most commonly found in the middle range of durations tested. The pattern of results emphasizes the importance of further study into those conditions under which the predicted asymmetries can be reliably demonstrated in healthy individuals. (C) 2003 Elsevier Science (USA). All rights reserved.
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