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Neural mechanisms for the effect of prior knowledge on audiovisual integration
Qiang Liu1, Ye Zhang, Jennifer L Campos
1Key Laboratory of Cognition and Personality, Ministry of Education, Southwest University, Chongqing 400715, China.
Abstract:
Converging evidence indicates that prior knowledge plays an important role in multisensory integration. However, the neural mechanisms underlying the processes with which prior knowledge is integrated with current sensory information remains unknown. In this study, we measured event-related potentials (ERPs) while manipulating prior knowledge using a novel visual letter recognition task in which auditory information was always presented simultaneously. The color of the letters was assigned to a particular probability of being associated with audiovisual congruency (e.g., green=high probability (HP) and blue=low probability (LP)). Results demonstrate that this prior began affecting reaction times to the congruent audiovisual stimuli at about the 900th trial. Consequently, the ERP data was analyzed in two phases: the "early phase" (
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