Perception of Frequency Contours via Temporal and Spatial Tactile Transforms

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Abstract
Two tactile coding schemes of voice fundamental frequency were compared in terms of the detection of terminal frequency changes in simple syllable-like frequency contours. The coding schemes were: (1) temporal, single-channel.sbd.in which input frequency is represented as rate of vibration; and, (2) spatial, multichannel.sbd.in which input frequency is represented as location of vibration. An adaptive, three-interval, forced choice oddity procedure was used. The temporal, single-channel coding scheme provided a frequency resolution between 0.2 and 0.3 octaves at the fingertip. The spatial, multichannel scheme provided a spatial resolution, on the forearm, of 1-channel, which, for this 16-channel display, translates into a frequency resolultion of 0.14 octaves. More learning was required with the temporal, single-channel coding scheme, than with the spatial, multichannel scheme.

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