首页> 美国卫生研究院文献>The Journal of Neuroscience >Audiovisual Synchrony Improves Motion Discrimination via Enhanced Connectivity between Early Visual and Auditory Areas
【2h】

Audiovisual Synchrony Improves Motion Discrimination via Enhanced Connectivity between Early Visual and Auditory Areas

机译:视听同步通过增强早期视觉和听觉区域之间的连接性来改善动作辨别力

代理获取
本网站仅为用户提供外文OA文献查询和代理获取服务,本网站没有原文。下单后我们将采用程序或人工为您竭诚获取高质量的原文,但由于OA文献来源多样且变更频繁,仍可能出现获取不到、文献不完整或与标题不符等情况,如果获取不到我们将提供退款服务。请知悉。

摘要

Audiovisual synchrony enables integration of dynamic visual and auditory signals into a more robust and reliable multisensory percept. In this fMRI study, we investigated the neural mechanisms by which audiovisual synchrony facilitates shape and motion discrimination under degraded visual conditions. Subjects were presented with visual patterns that were rotated by discrete increments at irregular and unpredictable intervals while partially obscured by a dynamic noise mask. On synchronous trials, each rotation coincided with an auditory click. On asynchronous trials, clicks were noncoincident with the rotational movements (but with identical temporal statistics). Subjects discriminated shape or rotational motion profile of the partially hidden visual stimuli. Regardless of task context, synchronous signals increased activations bilaterally in (1) calcarine sulcus (CaS) extending into ventral occipitotemporal cortex and (2) Heschl's gyrus extending into planum temporale (HG/PT) compared with asynchronous signals. Adjacent to these automatic synchrony effects, synchrony-induced activations in lateral occipital (LO) regions were amplified bilaterally during shape discrimination and in the right posterior superior temporal sulcus (pSTS) during motion discrimination. Subjects' synchrony-induced benefits in motion discrimination significantly predicted blood oxygenation level-dependent synchrony effects in V5/hMT+. According to dynamic causal modeling, audiovisual synchrony increased connectivity between CaS and HG/PT bidirectionally, whereas shape and motion tasks increased forwards connectivity from CaS to LO or to pSTS, respectively. To increase the salience of partially obscured moving objects, audiovisual synchrony may amplify visual activations by increasing the connectivity between low level visual and auditory areas. These automatic synchrony-induced response amplifications may then be gated to higher order areas according to behavioral relevance and task context.
机译:视听同步功能可将动态视觉和听觉信号集成到更强大和可靠的多感官感知中。在这项功能磁共振成像研究中,我们研究了视听同步在退化的视觉条件下促进形状和运动辨别的神经机制。向受试者呈现视觉图案,该图案以不规则且不可预测的间隔以离散增量旋转,同时被动态噪声蒙版部分遮盖。在同步试验中,每次旋转都伴随着听觉咔嗒声。在异步试验中,咔嗒声与旋转运动不重合(但具有相同的时间统计量)。受试者区分了部分隐藏的视觉刺激的形状或旋转运动轮廓。无论任务的背景如何,与异步信号相比,同步信号在(1)钙肌沟(CaS)延伸到腹枕颞皮层和(2)Heschl突回向两侧都增加了激活。邻近这些自动同步效应,在形状辨别期间在双侧枕骨(LO)区域中同步诱导的激活被放大,在运动辨别期间在右后颞上沟(pSTS)中被同步诱导的激活被放大。受试者在运动辨别中的同步诱发优势显着预测了V5 / hMT +中血液氧合水平依赖性的同步效应。根据动态因果模型,视听同步双向增加了CaS与HG / PT之间的连通性,而形状和运动任务分别增加了从CaS到LO或pSTS的向前连通性。为了增加部分被遮挡的运动物体的显着性,视听同步可以通过增加低级视觉和听觉区域之间的连通性来放大视觉激活。然后,可以根据行为相关性和任务上下文将这些自动同步诱发的响应放大控制到更高阶的区域。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
代理获取

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号