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Vibrotactile thresholds at the fingertip, volar forearm, large toe and heel

Vibrotactile thresholds at the fingertip, volar forearm, large toe and heel
Vibrotactile thresholds at the fingertip, volar forearm, large toe and heel
Thresholds for the perception of vibration vary with location on the body due to the organization of tactile channels in hairy and non-hairy skin, and variations in receptor density. This study determined vibration thresholds at four locations on the body with two different contactors so as to assist the identification of the tactile channel determining the threshold at each location. Vibrotactile thresholds at six frequencies from 8 to 250 Hz were measured on the distal phalanx of the index finger, the volar forearm, the large toe, and the heel with two contactors: (i) a 1-mm diameter circular probe with a 1-mm gap to a fixed circular surround (i.e., 7.1-mm2 excitation area), and (ii) a 6-mm diameter circular probe with a 2-mm gap to a fixed circular surround (i.e., 79-mm2 excitation area). At all frequencies and with both contactors, thresholds on the fingertip were lower than thresholds on the volar forearm, the large toe, and the heel, consistent with a greater density of mechanoreceptors at the fingertip. Thresholds with the larger contactor were lower than thresholds with the smaller contactor on the fingertip at high frequencies (63, 125, and 250 Hz), on the large toe (except at 250 Hz), on the heel (at all frequencies), and on the volar forearm at 250 Hz. It is concluded that at least two tactile channels (Pacinian from 63 to 250 Hz, and non-Pacinian from 8 to 31.5 Hz) determined vibrotactile thresholds at the fingertip, whereas non-Pacinian channels had a dominant influence on vibrotactile thresholds at the volar forearm. The role of Pacinian and non-Pacinian channels could not be confirmed at the large toe or the heel despite some evidence of spatial summation.
vibration, threshold, tactile channel, contact location
0899-0220
101-112
Morioka, Miyuki
8eb26aca-8773-4e45-8737-61c2438d30d9
Whitehouse, Darren J.
a54f52f0-b41c-4e52-841a-df50987df887
Griffin, Michael J.
24112494-9774-40cb-91b7-5b4afe3c41b8
Morioka, Miyuki
8eb26aca-8773-4e45-8737-61c2438d30d9
Whitehouse, Darren J.
a54f52f0-b41c-4e52-841a-df50987df887
Griffin, Michael J.
24112494-9774-40cb-91b7-5b4afe3c41b8

Morioka, Miyuki, Whitehouse, Darren J. and Griffin, Michael J. (2008) Vibrotactile thresholds at the fingertip, volar forearm, large toe and heel. Somatosensory & Motor Research, 25 (2), 101-112. (doi:10.1080/08990220802045574).

Record type: Article

Abstract

Thresholds for the perception of vibration vary with location on the body due to the organization of tactile channels in hairy and non-hairy skin, and variations in receptor density. This study determined vibration thresholds at four locations on the body with two different contactors so as to assist the identification of the tactile channel determining the threshold at each location. Vibrotactile thresholds at six frequencies from 8 to 250 Hz were measured on the distal phalanx of the index finger, the volar forearm, the large toe, and the heel with two contactors: (i) a 1-mm diameter circular probe with a 1-mm gap to a fixed circular surround (i.e., 7.1-mm2 excitation area), and (ii) a 6-mm diameter circular probe with a 2-mm gap to a fixed circular surround (i.e., 79-mm2 excitation area). At all frequencies and with both contactors, thresholds on the fingertip were lower than thresholds on the volar forearm, the large toe, and the heel, consistent with a greater density of mechanoreceptors at the fingertip. Thresholds with the larger contactor were lower than thresholds with the smaller contactor on the fingertip at high frequencies (63, 125, and 250 Hz), on the large toe (except at 250 Hz), on the heel (at all frequencies), and on the volar forearm at 250 Hz. It is concluded that at least two tactile channels (Pacinian from 63 to 250 Hz, and non-Pacinian from 8 to 31.5 Hz) determined vibrotactile thresholds at the fingertip, whereas non-Pacinian channels had a dominant influence on vibrotactile thresholds at the volar forearm. The role of Pacinian and non-Pacinian channels could not be confirmed at the large toe or the heel despite some evidence of spatial summation.

Text
14594 DJW-MM-MJG 2008 Vibrotactile_thresholds_at_finger,_forearm,_toe,_and_heel - Accepted Manuscript
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More information

Published date: 2008
Keywords: vibration, threshold, tactile channel, contact location
Organisations: Human Sciences Group, Institute of Sound & Vibration Research

Identifiers

Local EPrints ID: 58637
URI: https://eprints.soton.ac.uk/id/eprint/58637
ISSN: 0899-0220
PURE UUID: 49c64246-6709-423f-b5f8-ac8659089033
ORCID for Michael J. Griffin: ORCID iD orcid.org/0000-0003-0743-9502

Catalogue record

Date deposited: 18 Aug 2008
Last modified: 24 Sep 2019 00:59

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