Auditory cortex conveys non-topographic sound localization signals to visual cortex

Camille Mazo (), Margarida Baeta and Leopoldo Petreanu ()
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Camille Mazo: Champalimaud Foundation
Margarida Baeta: Champalimaud Foundation
Leopoldo Petreanu: Champalimaud Foundation

Nature Communications, 2024, vol. 15, issue 1, 1-16

Abstract: Abstract Spatiotemporally congruent sensory stimuli are fused into a unified percept. The auditory cortex (AC) sends projections to the primary visual cortex (V1), which could provide signals for binding spatially corresponding audio-visual stimuli. However, whether AC inputs in V1 encode sound location remains unknown. Using two-photon axonal calcium imaging and a speaker array, we measured the auditory spatial information transmitted from AC to layer 1 of V1. AC conveys information about the location of ipsilateral and contralateral sound sources to V1. Sound location could be accurately decoded by sampling AC axons in V1, providing a substrate for making location-specific audiovisual associations. However, AC inputs were not retinotopically arranged in V1, and audio-visual modulations of V1 neurons did not depend on the spatial congruency of the sound and light stimuli. The non-topographic sound localization signals provided by AC might allow the association of specific audiovisual spatial patterns in V1 neurons.

Date: 2024
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DOI: 10.1038/s41467-024-47546-4

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