Magnetoencephalography recordings reveal the neural mechanisms of auditory contributions to improved visual detection.

ABSTRACT: Sounds enhance the detection of visual stimuli while concurrently biasing an observer's decisions. To investigate the neural mechanisms that underlie such multisensory interactions, we decoded time-resolved Signal Detection Theory sensitivity and criterion parameters from magneto-encephalographic recordings of participants that performed a visual detection task. We found that sounds improved visual detection sensitivity by enhancing the accumulation and maintenance of perceptual evidence over time. Meanwhile, criterion decoding analyses revealed that sounds induced brain activity patterns that resembled the patterns evoked by an actual visual stimulus. These two complementary mechanisms of audiovisual interplay differed in terms of their automaticity: Whereas the sound-induced enhancement

SUBMITTER: Perez-Bellido A 

PROVIDER: S-EPMC9816120 | biostudies-literature | 2023 Jan

REPOSITORIES: biostudies-literature