Automatic attention lateral asymmetry in visual discrimination tasks |
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Authors: | L L Righi L E Ribeiro-do-Valle |
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Institution: | 1.Department of Physiology and Biophysics, Institute of Biomedical Sciences,University of S?o Paulo,S?o Paulo,Brazil |
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Abstract: | There is evidence that automatic visual attention favors the right side. This study investigated whether this lateral asymmetry
interacts with the right hemisphere dominance for visual location processing and left hemisphere dominance for visual shape
processing. Volunteers were tested in a location discrimination task and a shape discrimination task. The target stimuli (S2)
could occur in the left or right hemifield. They were preceded by an ipsilateral, contralateral or bilateral prime stimulus
(S1). The attentional effect produced by the right S1 was larger than that produced by the left S1. This lateral asymmetry
was similar between the two tasks suggesting that the hemispheric asymmetries of visual mechanisms do not contribute to it.
The finding that it was basically due to a longer reaction time to the left S2 than to the right S2 for the contralateral
S1 condition suggests that the inhibitory component of attention is laterally asymmetric. |
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Keywords: | |
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