The neural mechanisms of audiotactile binding depend on asynchrony.

Autor: Zumer JM; School of Psychology, University of Birmingham, Birmingham, UK.; Centre for Computational Neuroscience and Cognitive Robotics, University of Birmingham, Birmingham, UK.; Centre for Human Brain Health, University of Birmingham, Birmingham, UK.; School of Life and Health Sciences, Aston University, Birmingham, UK., White TP; School of Psychology, University of Birmingham, Birmingham, UK.; Centre for Computational Neuroscience and Cognitive Robotics, University of Birmingham, Birmingham, UK., Noppeney U; School of Psychology, University of Birmingham, Birmingham, UK.; Centre for Computational Neuroscience and Cognitive Robotics, University of Birmingham, Birmingham, UK.; Centre for Human Brain Health, University of Birmingham, Birmingham, UK.; Donders Institute for Brain, Cognition, and Behaviour, Nijmegen, The Netherlands.
Jazyk: angličtina
Zdroj: The European journal of neuroscience [Eur J Neurosci] 2020 Dec; Vol. 52 (12), pp. 4709-4731. Date of Electronic Publication: 2020 Sep 01.
DOI: 10.1111/ejn.14928
Abstrakt: Asynchrony is a critical cue informing the brain whether sensory signals are caused by a common source and should be integrated or segregated. This psychophysics-electroencephalography (EEG) study investigated the influence of asynchrony on how the brain binds audiotactile (AT) signals to enable faster responses in a redundant target paradigm. Human participants actively responded (psychophysics) or passively attended (EEG) to noise bursts, "taps-to-the-face" and their AT combinations at seven AT asynchronies: 0, ±20, ±70 and ±500 ms. Behaviourally, observers were faster at detecting AT than unisensory stimuli within a temporal integration window: the redundant target effect was maximal for synchronous stimuli and declined within a ≤70 ms AT asynchrony. EEG revealed a cascade of AT interactions that relied on different neural mechanisms depending on AT asynchrony. At small (≤20 ms) asynchronies, AT interactions arose for evoked response potentials (ERPs) at 110 ms and ~400 ms post-stimulus. Selectively at ±70 ms asynchronies, AT interactions were observed for the P200 ERP, theta-band inter-trial coherence (ITC) and power at ~200 ms post-stimulus. In conclusion, AT binding was mediated by distinct neural mechanisms depending on the asynchrony of the AT signals. Early AT interactions in ERPs and theta-band ITC and power were critical for the behavioural response facilitation within a ≤±70 ms temporal integration window.
(© 2020 The Authors. European Journal of Neuroscience published by Federation of European Neuroscience Societies and John & Sons Ltd.)
Databáze: MEDLINE
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