Electrophysiological study of the effects of nodal distance on a stimulus equivalence task

PASQUALETTI, GUILLERMO; IGNACIO, POLTI; SANCHEZ, FEDERICO; MASSARO, MATÍAS; MENÉNDEZ, JOAQUÍN; YORIO, ALBERTO

La Habana

Workshop; Havana Winter School 2015: Statistical physics approaches to systems biology.; 2015

Universidad de La Habana

In this study participants performed a stimulus equivalence task with arbitrary visual stimuli. First, they were trained in baseline conditional relations among stimuli that were interlinked by several interposed elements (nodes). Then they were tested on the equivalence criteria. Electroencephalographic recordings were taken.    The goals of this study were: 1) to compare ERP recordings between symmetry, equivalence one-node and equivalence three-node test trials; 2) to investigate the synchronization?s degree between brain regions across these test conditions.    Our predictions were that the EEG regional-synchronization and late components of the ERP waves would exhibit differences among test conditions. The results showed differences among conditions on both parameters. We conclude that these differences are indicative of differential cortical processes between conditions.