Moriyama T, Horikawa J, Hosokawa Y, Taniguchi I
Department of Neurophysiology, Medical Research Institute, Tokyo Medical and Dental University, Japan.
Acta Otolaryngol Suppl. 1997;532:138-40. doi: 10.3109/00016489709126164.
The frequency dependency of directional sensitivity of the auditory cortex of barbiturate-anesthetized guinea pigs in response to tone bursts was studied by an optical equipment and a voltage sensitive dye (RH795). Tone bursts at 4, 8 and 14 kHz were presented from loudspeakers placed at the azimuths from contralateral 90 degrees to ipsilateral 90 degrees in 30 degrees steps on a front-horizontal semi-circular board (100 cm in radius). The maximum responses were observed at around contralateral 30 degrees (best azimuth). The onset and peak latencies were the shortest at the best azimuth. The best azimuth was the same for all these frequencies, but the azimuth selectivity became broader for the lower frequencies. These results indicate that the azimuth selectivity observed in the guinea pig auditory cortex is mainly associated with pinna characteristics.
用光学设备和电压敏感染料（RH795）研究了巴比妥麻醉的豚鼠听觉皮层对短纯音反应的方向敏感性的频率依赖性。在半径为100厘米的前水平半圆形板上，从位于对侧90度到同侧90度方位的扬声器以30度步长呈现4、8和14千赫的短纯音。在对侧约30度（最佳方位）处观察到最大反应。起始和峰值潜伏期在最佳方位处最短。所有这些频率的最佳方位相同，但低频的方位选择性变得更宽。这些结果表明，在豚鼠听觉皮层中观察到的方位选择性主要与耳廓特征有关。
