Auditory motion induces directionally dependent receptive field shifts in inferior colliculus neurons.
Auditory motion induces directionally dependent receptive field shifts in inferior colliculus neurons.
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听觉运动引起下丘神经元的方向依赖性感受野变化。
DOI：
10.1152/jn.1998.79.4.2040
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发表时间：
1998
期刊：
影响因子：
--
通讯作者：
O'Neill,WE
中科院分区：
文献类型：
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作者：
Wilson,WW;O'Neill,WE
[2]刘晓明.听觉运动诱导下丘神经元方向依赖性感受野移位.神经生理学，1998.本研究主要研究未麻醉的八字胡蝙蝠下丘神经元对表观听觉运动的反应。我们通过在前半场沿水平、垂直或倾斜的轨迹顺序地从一组扬声器中广播纯音突发来产生明显的运动刺激。运动方向对65%的样本单位的反应有影响。在这些细胞中，相反方向的运动导致感受场位置的移动，反应幅度的差异，或者两种效应的结合。感受场通常与运动方向相反(即，单位对进入接受场的移动声音的反应比离开时更大)，并获得向水平、垂直和倾斜运动方向的移动。反应潜伏期也随着运动方向的变化而移动，刺激部位诱发更多的尖峰计数也显示出最短的神经潜伏期。跨越接受场边界的运动似乎既是产生接受场移位的必要条件也是充分条件。减少表观运动序列中连续刺激之间的静默间隔增加了获得定向效应的可能性和感受场移位的幅度。我们认为，所观察到的定向效应可能可以通过“空间掩蔽”来解释，即听觉神经元在从空间中特别有效的位置受到刺激后的反应会减弱。听觉感受场的变化预计会改变运动声音的感知位置，并可能解释在心理物理学研究中观察到的运动来源定位的变化。听觉运动引起的感知目标位置的变化可能会被听觉捕食者利用，如Pteronotus在一种预测性跟踪策略中，以捕获移动的昆虫猎物。
Wilson, Willard W. and William E. O'Neill.Auditory motion induces directionally dependent receptive field shifts in inferior colliculus neurons.J. Neurophysiol.79: 2040–2062, 1998. This research focused on the response of neurons in the inferior colliculus of the unanesthetized mustached bat,Pteronotus parnelli,to apparent auditory motion. We produced the apparent motion stimulus by broadcasting pure-tone bursts sequentially from an array of loudspeakers along horizontal, vertical, or oblique trajectories in the frontal hemifield. Motion direction had an effect on the response of 65% of the units sampled. In these cells, motion in opposite directions produced shifts in receptive field locations, differences in response magnitude, or a combination of the two effects. Receptive fields typically were shifted opposite the direction of motion (i.e., units showed a greater response to moving sounds entering the receptive field than exiting) and shifts were obtained to horizontal, vertical, and oblique motion orientations. Response latency also shifted as a function of motion direction, and stimulus locations eliciting greater spike counts also exhibited the shortest neural latency. Motion crossing the receptive field boundaries appeared to be both necessary and sufficient to produce receptive field shifts. Decreasing the silent interval between successive stimuli in the apparent motion sequence increased both the probability of obtaining a directional effect and the magnitude of receptive field shifts. We suggest that the observed directional effects might be explained by “spatial masking,” where the response of auditory neurons after stimulation from particularly effective locations in space would be diminished. The shift in auditory receptive fields would be expected to shift the perceived location of a moving sound and may explain shifts in localization of moving sources observed in psychophysical studies. Shifts in perceived target location caused by auditory motion might be exploited by auditory predators such asPteronotusin a predictive tracking strategy to capture moving insect prey.