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(简答题)双耳线索在空间知觉中起什么作用? 

问答题
2022-04-02 23:12
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正确答案
答:时间差。从一侧来的声音,两耳感受声音刺激有时间上差异(即一只耳朵早于另一只耳朵)。这种时间差是声源方向定位的主要线索,声源被定位于先接受到刺激的耳朵一侧。 强度差。声音的强度随传播远近而改变,愈远愈弱。与声源同侧的耳朵获得声音较强,对侧耳朵由于声波受头颅阻挡得到的声音较弱。这样,声源就被定位于较强的一侧。 位相差。低频声音因波长较长,头颅的阻挡作用小,两耳听到的强度差也较小。这时,判定方位主要靠两耳感受声音的位相差,即同一频率声波的波形的不同部位作用于两耳,因而内耳鼓膜所受声波的压力也就有了差别。虽然这种差别很小,但它是低频声源定位的主要线索。

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