2026-09-19T17:12:55Zhttps://dspace.mit.edu/server/oai/requestoai:dspace.mit.edu:1721.1/356752022-01-13T07:54:36Zcom_1721.1_7582com_1721.1_7581col_1721.1_131023
Mandayam A. Srinivasan.
Ahn, Minseung
Massachusetts Institute of Technology. Dept. of Mechanical Engineering.
Massachusetts Institute of Technology. Department of Mechanical Engineering
2007-01-10T17:00:43Z
2007-01-10T17:00:43Z
2005
2005
http://hdl.handle.net/1721.1/35675
76837631
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2005.
Includes bibliographical references (p. 86-87).
Using a pin-array type tactile display as a stimulator of the finger pad, a psychophysical study was conducted on the vibrotactile perception. The passive touch with vibratory stimuli in the low frequency could be an alternative of the active touch for the presented stimuli: polygons, round shapes and gratings. As for the effect of frequency on the texture discrimination, the high correct answer proportions corresponded to the most sensitive frequency ranges of each mechanoreceptor. The spatial acuity decreased as the frequency of the stimuli increased when the stimuli presented by the equal number of contactors. As an analogy between color vision and tactile perception, a spatial configuration of the multiple contactors was proposed to deliver the intermediate pitch using the compound waveform defined as a sinusoidal stimulus which was presented by four contactors vibrating with 30Hz and 240Hz. The subjects felt qualitatively different the compound waveform and the pure-tone.
(cont.) When the high frequency component had 3 times the intensity of the other component, the perceived frequency of the compound waveform was about 120Hz which was much lower than the component frequency 240Hz. The experimental results were explained by the hypothesis of a ratio code, neural mechanism signaling the frequency of vibratory stimuli based on the ratio of the one-to-one activated population of mechanoreceptors. In addition, the intensity of the components also affected the overall perceived frequency.
by Minseung Ahn.
S.M.
87 p.
4373843 bytes
4377421 bytes
application/pdf
application/pdf
eng
Massachusetts Institute of Technology
M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission.
http://dspace.mit.edu/handle/1721.1/7582
Mechanical Engineering.
Tactile perception of spatially distributed vibratory stimuli on the fingerpad
Thesis
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<Abstract>Using a pin-array type tactile display as a stimulator of the finger pad, a psychophysical study was conducted on the vibrotactile perception. The passive touch with vibratory stimuli in the low frequency could be an alternative of the active touch for the presented stimuli: polygons, round shapes and gratings. As for the effect of frequency on the texture discrimination, the high correct answer proportions corresponded to the most sensitive frequency ranges of each mechanoreceptor. The spatial acuity decreased as the frequency of the stimuli increased when the stimuli presented by the equal number of contactors. As an analogy between color vision and tactile perception, a spatial configuration of the multiple contactors was proposed to deliver the intermediate pitch using the compound waveform defined as a sinusoidal stimulus which was presented by four contactors vibrating with 30Hz and 240Hz. The subjects felt qualitatively different the compound waveform and the pure-tone.</Abstract>
<Abstract>(cont.) When the high frequency component had 3 times the intensity of the other component, the perceived frequency of the compound waveform was about 120Hz which was much lower than the component frequency 240Hz. The experimental results were explained by the hypothesis of a ratio code, neural mechanism signaling the frequency of vibratory stimuli based on the ratio of the one-to-one activated population of mechanoreceptors. In addition, the intensity of the components also affected the overall perceived frequency.</Abstract>
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