彭不给力，只说圆锥面上最容易混淆，也没说清楚是侧面还是底面，偏巧北师的实战有一题答案是底面，上网查证了下，感觉洋人的说法貌似是在说侧面
Similarly the person experiences a cone of confusion for sounds coming from one side of the median plane. The person can tell from which side the sound comes, but he cannot discriminate among the sounds originating at the many points on the surface of the cone. This confusion results because all points on the cone are the same distance farther from one ear than from the other; and a sound originating at any point on the cone will provide the same difference in stimuli at the two ears
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