Gestalt perception is associated with reduced parietal beta oscillations

NeuroImage
Natalia Zaretskaya, Andreas Bartels

Abstract

The ability to perceive composite objects as a whole is fundamental for visual perception in a complex and cluttered natural environment. This ability may be mediated by increased communication between neural representations of distinct object elements, and has been linked to increased synchronization of oscillatory brain activity in the gamma band. Previous studies of perceptual grouping either guided attention between local and global aspects of a given stimulus or manipulated its physical properties to achieve grouped and ungrouped perceptual conditions. In contrast to those studies, we fully matched the physical properties underlying global and local percepts using a bistable stimulus that causes the viewer to perceive either local motion of multiple elements or global motion of two illusory shapes without any external change. To test the synchronization hypothesis we recorded brain activity with EEG, while human participants viewed the stimulus and reported changes in their perception. In contrast to previous findings we show that power of the beta-band was lower during perception of global Gestalt than during that of local elements. Source localization places these differences in the posterior parietal cortex, overlapping...Continue Reading

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Citations

Mar 16, 2016·NeuroImage·Pablo R GrassiAndreas Bartels
Apr 19, 2016·Cortex; a Journal Devoted to the Study of the Nervous System and Behavior·Luca RonconiRosilari Bellacosa Marotti
Apr 24, 2016·Neuroscience Letters·Paulo BarrazaEugenio Rodríguez
Sep 19, 2018·Scientific Reports·Thiago Leiros CostaPaulo Sérgio Boggio

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