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Neural Correlates of Temporal Complexity and Synchrony during Audiovisual Correspondence Detection

Baumann, O; Vromen, JMG; Cheung, A; McFadyen, J; Ren, Y; Guo, CC; (2018) Neural Correlates of Temporal Complexity and Synchrony during Audiovisual Correspondence Detection. eNeuro , 5 (1) 10.1523/ENEURO.0294-17.2018. Green open access

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Abstract

We often perceive real-life objects as multisensory cues through space and time. A key challenge for audiovisual integration is to match neural signals that not only originate from different sensory modalities but also that typically reach the observer at slightly different times. In humans, complex, unpredictable audiovisual streams lead to higher levels of perceptual coherence than predictable, rhythmic streams. In addition, perceptual coherence for complex signals seems less affected by increased asynchrony between visual and auditory modalities than for simple signals. Here, we used functional magnetic resonance imaging to determine the human neural correlates of audiovisual signals with different levels of temporal complexity and synchrony. Our study demonstrated that greater perceptual asynchrony and lower signal complexity impaired performance in an audiovisual coherence-matching task. Differences in asynchrony and complexity were also underpinned by a partially different set of brain regions. In particular, our results suggest that, while regions in the dorsolateral prefrontal cortex (DLPFC) were modulated by differences in memory load due to stimulus asynchrony, areas traditionally thought to be involved in speech production and recognition, such as the inferior frontal and superior temporal cortex, were modulated by the temporal complexity of the audiovisual signals. Our results, therefore, indicate specific processing roles for different subregions of the fronto-temporal cortex during audiovisual coherence detection.

Type: Article
Title: Neural Correlates of Temporal Complexity and Synchrony during Audiovisual Correspondence Detection
Location: United States
Open access status: An open access version is available from UCL Discovery
DOI: 10.1523/ENEURO.0294-17.2018
Publisher version: https://doi.org/10.1523/ENEURO.0294-17.2018
Language: English
Additional information: © 2018 Baumann et al. This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 International license, which permits unrestricted use, distribution and reproduction in any medium provided that the original work is properly attributed. http://creativecommons.org/licenses/by/4.0/
Keywords: audiovisual, fMRI, human, multisensory, Adolescent, Adult, Auditory Perception, Brain, Brain Mapping, Female, Humans, Magnetic Resonance Imaging, Male, Psychophysics, Time Perception, Visual Perception, Young Adult
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > UCL Queen Square Institute of Neurology
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > UCL Queen Square Institute of Neurology > Imaging Neuroscience
URI: https://discovery.ucl.ac.uk/id/eprint/10071069
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