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Talk by Prof. Christoph Kayser

Universität Bielefeld

begin
05 May 2021 11:00
end
05 May 2021
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online

We hereby announce the next talk in the
'Computational and Systems Neuroscience Virtual Seminar' in short: 'CSN Virtual Seminar'
on

How multisensory perception is shaped by causal inference and serial effects

by

Prof. Christoph Kayser
Universität Bielefeld

on Wed, 5th of May 2021, 11am

Abstract:

Being able to adaptively navigate our complex environment requires that our brain flexibly selects and combine cues that arise from a common origin whilst avoiding distraction from irrelevant inputs. We asked how the brain implements such inference process by studying the combination of audio-visual information in ventriloquist-like tasks, both within a trial and between trials. We find that within-trial integration is mediated by a systematic spatio-temporal cascade of the relevant computations, starting with early segregated unisensory representations, continuing with sensory fusion in parietal-temporal regions and culminating as causal inference in the frontal lobe. In particular, inferior frontal regions guide flexible integration based on the context-dependent causal inference within a trial. The adaptive between trial recalibration of perception based on multisensory evidence was mediated by medial parietal regions, which integration information within and between trials and provide a history-dependent influence on perceptual decisions. Interestingly, when looking at an aging population, these history dependent influences seem to shift away from a sensory-driven to a response-driven pattern, suggesting that these some of these mechanisms driving adaptive behaviour change with age.

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