Abstract
The just noticeable difference in phase (ΔΘ) was measured for binaural stimulation and for stimulation of the ring and index fingertips of the same hand. At stimulus frequencies of 40, 60, 120, and 240 Hz, differences in phase up to 120° had no effect on cutaneous localization, while the values of binaural ΔΘ were only 3.6° and 3.3° for 120- and 240-Hz tones, respectively. When the vibration frequency was lowered to 20 Hz, a cutaneous ΔΘ of 47° was obtained. At this frequency, the locus of cutaneous stimulation was found to greatly influence ΔΘ. When the index fingertips of the two hands were stimulated, ΔΘ was 90°, and was 45° when the ring and index fingertips of the same hand were stimulated. A relatively low ΔΘ of 12° was obtained when both vibrator contactors were placed on the same fingertip. The results of this study fail to support von Békésy's hypothesis that the same time delays in stimulation are equally effective as cues in auditory localization and its cutaneous analog.
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