Probing the Spatial Acuity of the Thigh for Enhanced Sensory

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University of Guelph


Amputation impairs sensory feedback and limb movement. Embedding tactile displays in transfemoral prosthetic sockets to convey movement cues through varied vibration patterns is seen as a promising avenue. To optimize the functionality of such displays, it is essential to determine the minimum distance required to discriminate between two distinct sources of vibration. This thesis aims to address this crucial requirement and explore any variations in the ability to perceive distinct vibration points due to vibration frequency. The distances needed for discerning separate vibration points at the thigh were determined to be between 25mm and 30 mm. Results highlight that frequency did not enhance spatial acuity. The findings also revealed a higher accuracy in discriminating vertically oriented vibration points compared to horizontally oriented ones. This thesis' outcomes offer important insights for designing a tactile display that enables users to precisely perceive and respond to various vibration patterns.



sensory substitution, two-point discrimination, psychophysics, prostheses