NDLI: Functional brain organization of global and local visual perception: Analysis of event-related potentials

Content Provider	Springer Nature Link
Author	Machinskaya, R. I. Krupskaya, E. V. Kurgansky, A. V.
Copyright Year	2010
Abstract	Event-related potentials (ERP) of the brain and psychometric indices (reaction time and percentage of correct responses) were studied in adult subjects during recognizing hierarchical visual stimuli (letters), while the subject’s attention was drawn to either the global or the local level of the stimulus. The psychophysical indices demonstrated the global precedence effect, i.e., an increased recognition time of a small letter, which was a part of an incongruent stimulus. The ERP component analysis demonstrated that differences in the regulatory mechanisms of attention and timing and topography of brain organization during processing of visual information depended on the level of recognizing the hierarchical stimulus (global vs. local). Visual recognition at the local level was accompanied by a stronger activation of visual associative areas (P z and T 6) at the stage of sensory feature analysis (P1 ERP component), as well as by the predominant involvement of the temporal inferior cortex of the right hemisphere (T 6) at the stage of sensory categorization (the P2 ERP component) and of the frontal cortex of the right hemisphere at the stage of selection for the relevant target features (the N2 ERP component). Visual recognition at the global level was accompanied by significant involvement of the early sensory selection (the N1 ERP component) and predominant activation of the parietal cortex of the right hemisphere (P 4) at the stage of sensory categorization (the P2 ERP component), as well as at the stage of identification of the target stimulus (the P3 ERP component). Perception of a stimulus at the global level is assumed to depend mostly on the analysis of its spatial features in the dorsal visual system, whereas perception at the local level involves analysis of the object-related features in the ventral visual system.
Starting Page	518
Ending Page	534
Page Count	17
File Format	PDF
ISSN	03621197
Journal	Human Physiology
Volume Number	36
Issue Number	5
e-ISSN	16083164
Language	English
Publisher	SP MAIK Nauka/Interperiodica
Publisher Date	2010-10-03
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	visual perception hierarchical global/local recognition of the visual stimuli dorsal and ventral visual systems event-related potentials (ERP) Biomedicine general Life Sciences Human Physiology
Content Type	Text
Resource Type	Article
Subject	Physiology Physiology (medical)

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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