Characterization of the Functional Interhemispheric Connectivity using EEG and a Bistable Visual Illusion of Movement
cortex visual, corpus callosum, visual-evoked potential, apparent motion, Gestalt, graph theory
Visual illusions can be defined as a dissociation of the physical properties of a visual stimulus that generates an altered or bistable perception. In the field of illusions, the Motion Quartet (MQT) is a well-studied paradigm characterized by generating illusory motion in cardinal directions: vertical and horizontal. However, there is still no evidence regarding the display of this stimulus in different regions of the visual field or after the substitution of its constituent elements by Gabor patches during electroencephalography (EEG) recording. Thus, this project aims to characterize the inter- and intra-hemispheric connectivity of the visual cortex in healthy individuals. At the moment, 32 healthy volunteers have participated in the study. All volunteers went through the following stages: pre-evaluation, screening, and EEG experiment during the performance of the MQT task. After recording, inter-hemispheric connectivity was evaluated using computational metrics and their relationships with each volunteer's behavioral response. The results of this project will help understand the electrophysiological mechanisms involved in the display of MQT (or the visualization of a visual illusion) in different spatial regions or the modification of its constituent elements and may establish a baseline for this phenomenon in a sample of healthy volunteers.