The same sound reaches right and left ear at different times {interaural time difference, hearing} (ITD), because distances from source location to ear differ, and ears have distance between them. Hearing can detect several microseconds of time difference. Slight head movements are enough to eliminate direction ambiguity. Interaural time difference uses frequencies lower than 1500 Hz, because they have no body damping.
Medial superior olive detects time differences between left-right ears and right-left ears, to make opponent systems. To find distances, two receptor outputs go to two different neurons, which both send to difference-finding neuron. Interaural time difference and interaural level difference work together.
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Date Modified: 2022.0224