Semple M N, Aitkin L M, Calford M B, Pettigrew J D, Phillips D P
Hear Res. 1983 May;10(2):203-15. doi: 10.1016/0378-5955(83)90054-0.
Auditory spatial receptive fields of 122 single units in the inferior colliculus of 8 anesthetised cats were studied with free-field acoustic stimuli presented in the frontal hemisphere. The best frequency and best frequency threshold were determined for each unit with the speaker located in a position where the unit responded strongly. The intensity was then raised to 10 dB above threshold at the best frequency and the boundaries of the spatial receptive field were determined. For sounds of low intensity, receptive field size appeared to be a continuum with respect to best frequency. Units of high best frequency had small circumscribed fields located in the contralateral frontal hemifield. The boundaries of receptive fields for units of progressively lower best frequency expanded in all directions. Thus for intermediate frequencies, fields typically filled the contralateral hemifield whereas for low frequencies, units could be activated by stimulation from any position tested. At higher intensities, the boundaries of the receptive fields of units expanded. Circumscribed receptive field centres lay on a line corresponding to the acoustical axis of the contralateral pinna. For these units with small receptive fields, the free-field response to low intensity sounds appeared to be attributable more to the directional properties of the contralateral pinna than to significant binaural interaction.
在8只麻醉猫的下丘中，对122个单神经元的听觉空间感受野进行了研究，采用在额叶半球呈现的自由场声刺激。当扬声器位于神经元强烈反应的位置时，确定每个神经元的最佳频率和最佳频率阈值。然后将强度提高到最佳频率阈值以上10分贝，并确定空间感受野的边界。对于低强度声音，感受野大小相对于最佳频率似乎是连续变化的。最佳频率高的神经元具有位于对侧额叶半视野的小的限定区域的感受野。最佳频率逐渐降低的神经元的感受野边界向各个方向扩展。因此，对于中频，感受野通常占据对侧半视野，而对于低频，任何测试位置的刺激都可激活神经元。在较高强度时，神经元感受野的边界扩展。限定的感受野中心位于与对侧耳廓声轴相对应的一条线上。对于这些具有小感受野的神经元，对低强度声音的自由场反应似乎更多地归因于对侧耳廓的方向特性，而非显著的双耳相互作用。
