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首页> 外文期刊>The European Journal of Neuroscience >Automatic detection of motion direction changes in the human brain.
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Automatic detection of motion direction changes in the human brain.

机译：自动检测人脑中的运动方向变化。

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Abstract The possibility that the visual system is able to register unattended changes is still debated in the literature. However, it is difficult to understand how a sensory system becomes aware of unexpected salient changes in the environment if attention is required for detecting them. The ability to automatically detect unusual changes in the sensory environment is an adaptive function which has been confirmed in other sensory modalities (i.e. audition). This deviance detector mechanism has proven to be based on a preattentive nonrefractory memory-comparison process. To investigate whether such automatic change detection mechanism exists in the human visual system, we recorded event-related potentials to sudden changes in a biologically important feature, motion direction. Unattended sinusoidal gratings varying in motion direction in the peripheral field were presented while subjects performed a central task with two levels of difficulty. We found a larger negative displacement in the electrophysiological response elicited by less frequent stimuli (deviant) at posterior scalp locations. Within the latency range of the visual evoked component N2, this differential response was elicited independently of the direction of motion and processing load. Moreover, the results showed that the negativity elicited by deviants was not related to a differential refractory state between the electrophysiological responses to frequent and infrequent directions of motion, and that it was restricted to scalp locations related to motion processing areas. The present results suggest that a change-detection mechanism sensitive to unattended changes in motion direction may exist in the human visual system.
机译：摘要视觉系统能够记录无人看管的变化的可能性在文献中仍存在争议。但是，如果需要注意检测感觉系统，则很难理解感觉系统如何意识到环境中的显着变化。自动检测感官环境中异常变化的能力是一种自适应功能，已在其他感官模式（即试听）中得到证实。这种偏差检测器机制已被证明是基于一种细心的非耐火存储器比较过程。为了调查这种自动变化检测机制是否存在于人类视觉系统中，我们记录了与事件有关的电位，这些电位是生物学上重要的特征，运动方向突然变化的原因。提出了无人看管的正弦光栅，其在周边领域中在运动方向上变化，而受试者则执行具有两个难度的中心任务。我们发现在后头皮位置较不频繁的刺激（异常）引起的电生理反应中较大的负位移。在视觉诱发组件N2的等待时间范围内，该差异响应是独立于运动方向和处理负载而引发的。此外，结果表明，异常引起的消极状态与对频繁和不频繁运动方向的电生理反应之间的差异性难治状态无关，并且它局限于与运动处理区域相关的头皮位置。目前的结果表明，在人类视觉系统中可能存在对运动方向的无人注意变化敏感的变化检测机制。

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