Binaural time discrimination

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Abstract
The least discriminable change in the position of a sound image was measured for pure tone with and without initial interaural delay, as well as for complex tones. The signals were either perfectly regular or jittered. The introduction of jitter allowed the subjects to lateralize equal‐amplitude tones beyond 1500 Hz, which has been assumed to represent the limit for binaural phase discrimination. No frequency limit for jittered tones either in a fixed relationship or as binaural beats could be found. The smallest deviation from regularity employed was 0.2 μsec, and under certain conditions it was effective in producing lateralization. With no jitter in one ear, jitter in the other ear was ineffective. For a given high‐frequency jittered tone,discrimination improves up to a limit with level and jitter magnitude. Complex tones, jittered and unjittered, show smaller just‐noticeable differences for low and medium frequencies. Some other implications of these findings are discussed. A striking similarity between the curves for binaural time discrimination and those for pitchdiscrimination was found. Subject Classification: [43]65.68, [43]65.62, [43]65.60.

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