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首页> 外文期刊>The European Journal of Neuroscience >Human sound-localization behaviour after multiple changes in eye position.
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Human sound-localization behaviour after multiple changes in eye position.

机译：眼睛位置多次改变后的人类声音定位行为。

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Orienting the eyes towards a peripheral sound source calls for a transformation of the head-centred sound coordinates into an oculocentric motor command, which requires an estimate of current eye position. Current models of saccadic control explain spatial accuracy by oculocentric transformations that rely on efference copies of relative eye-displacement signals, rather than on absolute eye position in the orbit. In principle, the gaze-control system could keep track of instantaneous eye position by vector addition of intervening eye-displacement commands. However, given that each motor update is endowed with some noise, the neural estimate of eye orientation is then expected to become noisier with increasing number of intervening saccades. As a consequence, the localization response will also be noisier. According to the alternative, in which target updates rely on feedback of the current eye position, such an increase in errors would be absent. In an attempt to dissociate these hypotheses, we studied the influence of the accumulation of oculomotor commands prior to a sound-localization response. Head-restrained subjects generated voluntary eye movements in darkness in random directions for a period between 0.2 and 15 s, after which they rapidly reoriented the eyes towards a brief sound burst. The results demonstrate that the audiomotor system programmes the orienting response on the basis of actual eye position, rather than on an accumulated estimate from intervening eye displacements.
机译：将眼睛朝向外围声源定向需要将以头为中心的声音坐标转换为以眼动马达命令，这需要估计当前的眼睛位置。当前的声调控制模型通过眼动转换来解释空间精度，眼动转换依赖于相对眼位移信号的有效副本，而不是眼眶中的绝对眼位置。原则上，凝视控制系统可以通过矢量添加中间的眼睛位移命令来跟踪瞬时眼睛位置。但是，由于每次运动更新都带有一定的噪声，因此，随着中间扫视次数的增加，对眼睛方向的神经估计会变得更加嘈杂。结果，本地化响应也将更加嘈杂。根据备选方案，其中目标更新依赖于当前眼位的反馈，将不存在这种误差增加。为了消除这些假设，我们研究了在声音定位响应之前动眼指令积累的影响。头部受约束的受试者在黑暗中随机方向随机产生了0.2至15 s的眼睛运动，此后他们迅速将眼睛重新定向为短暂的声音爆发。结果表明，音频电机系统根据实际的眼睛位置而不是根据中间的眼睛位移的累积估算值来编程定向响应。

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