| Autor: | I. N. Baranov-Krylov, D. N. Berlov, V. T. Shuvaev |
|---|---|
| Rok vydání: | 2003 |
| Předmět: |
Communication
Visual perception Visual N1 Physiology business.industry Photic Stimulation media_common.quotation_subject Subliminal stimuli Contingent negative variation medicine.anatomical_structure Cerebral cortex Physiology (medical) Perception P3b medicine business Psychology Neuroscience media_common |
| Zdroj: | Human Physiology. 29:415-422 |
| ISSN: | 0362-1197 |
| Popis: | Monopolar evoked potentials (EPs) in the parietal and temporal leads were recorded in 23 young, healthy subjects in the process of selection of visual stimuli by shape and localization. Two different central stimuli (selection by shape) and two similar right and left stimuli (selection by localization) were presented in the first series. Two simple right and left stimuli were presented in the second series, and a subject had to respond either to their shape or their localization. During spatial attention and shape recognition in both tasks, characteristics of the prestimulus negativity (contingent negative variation (CNV)) and negative–positive N1–P3 complex pointed to the predominant activation of the parietal areas. The greatest differences were observed in the late P3b component, associated with the “late” selection, rather than in the early EP components. The dominance of parietal activation as compared to temporal activation was associated with attention demands; i.e., the dominance was highest in the case of target stimuli and was least pronounced during passive perception of stimuli. It is suggested that the parietooccipital visual system leads in tasks demanding spatial and nonspatial attention to stimuli in a simple visual environment (without surrounding elements). |
| Databáze: | OpenAIRE |
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