Prediction of auditory spatial acuity from neural images on the owl's auditory space map
Prediction of auditory spatial acuity from neural images on the owl's auditory space map
复制标题
DOI：
10.1038/nature01835
复制
发表时间：
2003-08-14
期刊：
影响因子：
64.8
通讯作者：
Takahashi, TT
中科院分区：
文献类型：
--
作者：
Bala, ADS;Spitzer, MW;Takahashi, TT
猫头鹰可以分辨声源位置的变化，小到30度，并且可以将头对准声源的20度范围内（1，2）。中脑空间图中的非典型神经元具有跨越40度的空间感受野-这是行为阈值的许多倍。在这里，我们定量研究了仓鸮中脑听觉空间图中神经元活动和感知敏锐度之间的关系。通过分析刺激方位角的微小变化引起的放电率的变化，我们表明，大多数神经元可以可靠地信号源位置的变化小于行为阈值。每个源在空间图中由神经元群体中的活动焦点表示。来源的迁移导致这一群体的活动模式发生变化。我们表明，这种变化预测了猫头鹰检测源位置变化的能力。
The owl can discriminate changes in the location of sound sources as small as 3degrees and can aim its head to within 2degrees of a source(1,2). Atypical neuron in its midbrain space map has a spatial receptive field that spans 40degrees- a width that is many times the behavioural threshold(3). Here we have quantitatively examined the relationship between neuronal activity and perceptual acuity in the auditory space map in the barn owl midbrain. By analysing changes in firing rate resulting from small changes of stimulus azimuth, we show that most neurons can reliably signal changes in source location that are smaller than the behavioural threshold. Each source is represented in the space map by a focus of activity in a population of neurons. Displacement of the source causes the pattern of activity in this population to change. We show that this change predicts the owl's ability to detect a change in source location.