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Science 9 February 1973:
Vol. 179. no. 4073, pp. 590 - 592
DOI: 10.1126/science.179.4073.590
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Articles

Haptic Illusion: Apparent Elongation of a Disk Rotated between the Fingers

Robert H. Cormack 1

1 New Mexico Institute of Mining and Technology, Socorro 87801

A disk (coin) turned end over end between thumb and forefinger feels longer to the turning hand. The illusion grows rapidly for 30 seconds but does not become asymptotic within 60 seconds. The illusion increases with coin size and turning rate, and is independent of holding pressure. It appears to involve illusory mechanisms in both hands.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)