NeuroTalk:Neural computations of audio-visual coherence
Online Symposium
Evidence for neural computations of task-irrelevant temporally coherent visual stimuli on the auditory selective attention
Presenter: Dr. Fei Peng
Auditory selective attention can be enhanced or impaired depending on whether task-irrelevant visual stimuli are temporally coherent with acoustic targets or with competing distractors. Audio-visual (AV) temporal coherence might facilitate the binding of the features of auditory and visual stimuli to enable the AV object formation. However, it is unclear how AV temporal coherence and auditory selective attention interact at the neurophysiological level. Here, we measured neural activity using electroencephalography (EEG) while participants performed an auditory selective attention task. In the task, the envelope of two competing auditory streams changed independently, while the radius of a visual disc was manipulated to control the AV temporal relationships. Participants detected auditory transient deviants presented in the continuous target speech and ignored the deviants presented in the masker speech. We examined how AV temporal coherence affects the neural signatures of sound processing. Using the forward and backward model to quantify the neural response to speech envelope, we found that temporal coherence enhanced the AV integration for both attended and unattended speech. For the deviants presented in the unattended speech stream, the event-related response (ERP) amplitude was also modulated by the visual coherence, suggesting the task-irrelevant temporal coherence alone facilities the binding of the AV features pre-attentively. The result from the unattended stream provides evidence of neural signatures of bottom-up effects in the AV object formation. However, attention also modulated the neural response to the speech envelope. While, in most EEG channels, attention enhanced the ERP to deviant sounds independent of AV coherence, we also identified a spatiotemporal component of the ERP, likely originating from the superior temporal gyrus and the frontoparietal network, in which both attention and coherence synergistically modulated ERP amplitude. These results provide evidence of the neural signatures of bottom-up (coherence) and top-down (attention) effects in the AV object formation.
Bio
Dr. Fei Peng obtained her Ph.D. in Biomedical Engineering at Chongqing University, Chongqing, in 2019. She is currently a postdoctoral fellow in the City University of Hong Kong. Her research interests include neural correlates of auditory scene analysis and neural coding mechanisms of natural sounds, such as voice pitch contours of Mandarin tones and statistical features in the sound textures.
Moderator: Mr. Owen, Yuwen HE
(Ph.D. student, FHS/ICI-CCBS, University of Macau)
Time: 7:00 PM, Sep 3rd
Zoom ID: 959 6270 3011
Passcode: ccbs
Acknowledgements
NeuroTalk x Brain Technology
阅读原文 关键词
in the
from the
最新评论
推荐文章
作者最新文章
你可能感兴趣的文章
Copyright Disclaimer: The copyright of contents (including texts, images, videos and audios) posted above belong to the User who shared or the third-party website which the User shared from. If you found your copyright have been infringed, please send a DMCA takedown notice to [email protected]. For more detail of the source, please click on the button "Read Original Post" below. For other communications, please send to [email protected].
版权声明:以上内容为用户推荐收藏至CareerEngine平台,其内容(含文字、图片、视频、音频等)及知识版权均属用户或用户转发自的第三方网站,如涉嫌侵权,请通知[email protected]进行信息删除。如需查看信息来源,请点击“查看原文”。如需洽谈其它事宜,请联系[email protected]。
版权声明:以上内容为用户推荐收藏至CareerEngine平台,其内容(含文字、图片、视频、音频等)及知识版权均属用户或用户转发自的第三方网站,如涉嫌侵权,请通知[email protected]进行信息删除。如需查看信息来源,请点击“查看原文”。如需洽谈其它事宜,请联系[email protected]。