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2017 ; 148
(ä): 31-41
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Sounds facilitate visual motion discrimination via the enhancement of late
occipital visual representations
#MMPMID28082107
Kayser SJ
; Philiastides MG
; Kayser C
Neuroimage
2017[Mar]; 148
(ä): 31-41
PMID28082107
show ga
Sensory discriminations, such as judgements about visual motion, often benefit
from multisensory evidence. Despite many reports of enhanced brain activity
during multisensory conditions, it remains unclear which dynamic processes
implement the multisensory benefit for an upcoming decision in the human brain.
Specifically, it remains difficult to attribute perceptual benefits to specific
processes, such as early sensory encoding, the transformation of sensory
representations into a motor response, or to more unspecific processes such as
attention. We combined an audio-visual motion discrimination task with the
single-trial mapping of dynamic sensory representations in EEG activity to
localize when and where multisensory congruency facilitates perceptual accuracy.
Our results show that a congruent sound facilitates the encoding of motion
direction in occipital sensory - as opposed to parieto-frontal - cortices, and
facilitates later - as opposed to early (i.e. below 100ms) - sensory activations.
This multisensory enhancement was visible as an earlier rise of motion-sensitive
activity in middle-occipital regions about 350ms from stimulus onset, which
reflected the better discriminability of motion direction from brain activity and
correlated with the perceptual benefit provided by congruent multisensory
information. This supports a hierarchical model of multisensory integration in
which the enhancement of relevant sensory cortical representations is transformed
into a more accurate choice.