Temporal processing of active and passive head movement
Temporal processing of active and passive head movement
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DOI：
10.1007/s00221-011-2802-0
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发表时间：
2011-09-01
影响因子：
2
通讯作者：
Harris, Laurence R.
中科院分区：
文献类型：
--
作者：
Barnett-Cowan, Michael;Harris, Laurence R.
大脑甚至可以通过传出复制信号在执行之前就知道一个活跃的头部运动。事实上，活跃运动的感觉关联似乎被抑制了。然而，只有通过感觉反馈才能检测到头部的被动干扰。由于传出复制(预期假说)或感觉抑制(抑制假说)，主动头部运动的感知时间相对于被动运动的感知是否会加快(预期假设)？我们以其他感觉事件为时间参照点，比较了主动和被动头部运动的感知时序。受试者进行非加速的时间顺序和同步性判断，将感知到的主动和被动头部运动的开始与触觉、听觉和视觉刺激的开始进行比较。比较刺激必须延迟约45ms才能看起来与被动的头部运动一致，或者延迟约80ms才能看起来与主动的头部运动一致。对前庭激活的缓慢知觉反应与我们早期使用电流刺激的研究是一致的(Barnett-Cowan和Harris，2009)。在处理主动头部移动的定时时的意外额外延迟与抑制假说是兼容的，并且与在自产生的头部移动期间抑制前庭信号有关。
The brain can know about an active head movement even in advance of its execution by means of an efference copy signal. In fact, sensory correlates of active movements appear to be suppressed. Passive disturbances of the head, however, can be detected only by sensory feedback. Might the perceived timing of an active head movement be speeded relative to the perception of a passive movement due to the efferent copy (anticipation hypothesis) or delayed because of sensory suppression (suppression hypothesis)? We compared the perceived timing of active and passive head movement using other sensory events as temporal reference points. Participants made unspeeded temporal order and synchronicity judgments comparing the perceived onset of active and passive head movement with the onset of tactile, auditory and visual stimuli. The comparison stimuli had to be delayed by about 45 ms to appear coincident with passive head movement or by about 80 ms to appear aligned with an active head movement. The slow perceptual reaction to vestibular activation is compatible with our earlier study using galvanic stimulation (Barnett-Cowan and Harris 2009). The unexpected additional delay in processing the timing of an active head movement is compatible with the suppression hypothesis and is discussed in relation to suppression of vestibular signals during self-generated head movement.