华中师范大学学报（自然科学版）2011，Vol.45Issue(1)：95-99,5.
小鼠下丘神经元对不同调制范围的调频声的扫频方向选择性
Effect of frequency-modulated sound with different modulation ranges on sweep-directional selectivity of inferior collicular neurons in mouse
摘要
Abstract
Under free field sound stimulation condition, frequency-modulated (FM) sound of fixed amplitude and duration with 5 modulation ranges (MR), 2,4,8,16, and 32 kHz, were used in this experiment. The sweep-directional selectivity of the neurons to FM sounds and effect of MR on the sweep-directional selectivity were examined. 45 (44. 1％) neurons had sweep-directional selectivity to FM sound and remaining 57 (55.9 ％) neurons did not have sweep-directional selectivity among 102 neurons obtained in this experiment. The number of neurons with sweep-directional selectivity increased with MR increasing from 2 to 16 kHz, but number of neurons with sweep-directional selectivity decreased at MR of 32 kHz, and their half-band widths at 10 dB above minimum threshold (MT) appeared an asymmetry between high and low frequency sides.Half-band widths of these neurons at MR of 32 kHz were more asymmetrical and their sweep-directional selectivity was more remarkable. The result demonstrated that asymmetry of half-band width could affect sweep-directional selectivity of the neurons to FM sound and perhaps explain why neurons still had sweep-directional selectivity when they were stimulated by MR of FM sound within band width at 10 dB above MT.关键词
调频声/调制范围/扫频方向选择性/下丘神经元/小鼠Key words
frequency-modulated sound/ modulation range/ sweep-directional selectivity/ inferior collicular neurons/ mouse分类
生物科学引用本文复制引用
闫荣玲,廖阳,李安安,吴飞健,陈其才..小鼠下丘神经元对不同调制范围的调频声的扫频方向选择性[J].华中师范大学学报（自然科学版）,2011,45(1):95-99,5.基金项目
国家自然科学基金项目(31070971,31000959). （31070971,31000959）
