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Steady state visual evoked potentials reveal a signature of the pitch-size crossmodal association in visual cortex
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Steady state visual evoked potentials reveal a signature of the pitch-size crossmodal association in visual cortex
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Journal Article
Steady state visual evoked potentials reveal a signature of the pitch-size crossmodal association in visual cortex
2023
Overview
•Specific visual and acoustic features are often associated during perception.•One example is the pitch of a tone and the size of a visual object.•We used EEG to study the cerebral origin of such associations.•Steady-state visual evoked potentials suggest an origin near primary visual cortex.•Our results support a low-level account for crossmodal associations.
Crossmodal correspondences describe our tendency to associate sensory features from different modalities with each other, such as the pitch of a sound with the size of a visual object. While such crossmodal correspondences (or associations) are described in many behavioural studies their neurophysiological correlates remain unclear. Under the current working model of multisensory perception both a low- and a high-level account seem plausible. That is, the neurophysiological processes shaping these associations could commence in low-level sensory regions, or may predominantly emerge in high-level association regions of semantic and object identification networks. We exploited steady-state visual evoked potentials (SSVEP) to directly probe this question, focusing on the associations between pitch and the visual features of size, hue or chromatic saturation. We found that SSVEPs over occipital regions are sensitive to the congruency between pitch and size, and a source analysis pointed to an origin around primary visual cortices. We speculate that this signature of the pitch-size association in low-level visual cortices reflects the successful pairing of congruent visual and acoustic object properties and may contribute to establishing causal relations between multisensory objects. Besides this, our study also provides a paradigm can be exploited to study other crossmodal associations involving visual stimuli in the future.
Publisher
Elsevier Inc,Elsevier Limited,Elsevier
Subject
