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首页> 外文期刊>Journal of Neurophysiology >Electrical neuroimaging during auditory motion aftereffects reveals that auditory motion processing is motion sensitive but not direction selective
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Electrical neuroimaging during auditory motion aftereffects reveals that auditory motion processing is motion sensitive but not direction selective

机译：听觉运动后效应期间的电神经影像学检查表明听觉运动处理对运动敏感，但对方向没有选择性

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Following prolonged exposure to adaptor sounds moving in a single direction, participants may perceive stationary-probe sounds as moving in the opposite direction [direction-selective auditory motion aftereffect (aMAE)] and be less sensitive to motion of any probe sounds that are actually moving (motion-sensitive aMAE). The neural mechanisms of aMAEs, and notably whether they are due to adaptation of direction-selective motion detectors, as found in vision, is presently unknown and would provide critical insight into auditory motion processing. We measured human behavioral responses and auditory evoked potentials to probe sounds following four types of moving-adaptor sounds: leftward and rightward unidirectional, bidirectional, and stationary. Behavioral data replicated both direction-selective and motion-sensitive aMAEs. Electrical neuroimaging analyses of auditory evoked potentials to stationary probes revealed no significant difference in either global field power (GFP) or scalp topography between leftward and rightward conditions, suggesting that aMAEs are not based on adaptation of direction-selective motion detectors. By contrast, the bidirectional and stationary conditions differed significantly in the stationary-probe GFP at 200 ms poststimulus onset without concomitant topographic modulation, indicative of a difference in the response strength between statistically indistinguishable intracranial generators. The magnitude of this GFP difference was positively correlated with the magnitude of the motion-sensitive aMAE, supporting the functional relevance of the neurophysiological measures. Electrical source estimations revealed that the GFP difference followed from a modulation of activity in predominantly right hemisphere frontal-temporal-parietal brain regions previously implicated in auditory motion processing. Our collective results suggest that auditory motion processing relies on motion-sensitive, but, in contrast to vision, non-direction-selective mechanisms.
机译：长时间暴露于沿单个方向移动的适配器声音后，参与者可能会感觉到固定探头的声音沿相反方向移动[方向选择性听觉运动后效应（aMAE）]，并且对实际移动的任何探针声音的运动不太敏感（对运动敏感的aMAE）。 aMAEs的神经机制，尤其是它们是否是由于视觉中发现的方向选择性运动检测器的适配所致，目前尚不清楚，并且将为听觉运动处理提供重要的见识。我们测量了人类的行为反应和听觉诱发电位，以探查以下四种类型的移动适配器声音：向左和向右单向，双向和固定。行为数据复制了方向选择性和运动敏感的aMAE。对固定探针的听觉诱发电位的电神经成像分析显示，在左向和向右条件之间，全局场功率（GFP）或头皮地形均无显着差异，这表明aMAE并非基于方向选择性运动探测器的适应性。相比之下，在没有刺激的地形调制的情况下，在200 ms刺激后发作时，固定探针GFP的双向和静态条件有显着差异，表明统计上无法区分的颅内发生器之间的响应强度存在差异。 GFP差异的大小与运动敏感的aMAE的大小呈正相关，支持了神经生理措施的功能相关性。电源估计表明，GFP差异是由先前参与听觉运动处理的主要是右半球额颞叶顶脑区域的活动调节引起的。我们的集体结果表明，听觉运动处理依赖于运动敏感，但与视觉相反，非方向选择性机制。

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