ILLUSION OF WEIGHT PERCEPTION CAUSED BY TEMPORAL MISMATCH

Hiroyuki Kambara Duk Shin Toshihiro Kawase Natsue Yoshimura, Yasuharu Koike

Abstract

The perception of an object’s heaviness is not only dependent on its weight. It is well known that spatial information of an object, such as size, can easily deceive our perception of its heaviness. To further understand neural mechanism underlying weight perception, we investigated effects of temporal information on the weight perception. We conducted experiments in which a falling ball is displayed on a screen and load force of the ball is exerted on the hand by a haptic device. By shifting the timing of load force exertion away from visual contact timing (i.e., time when the ball hit the hand in the display), we found that the ball was perceived heavier/lighter when force was applied earlier/later than visual contact. We also found that the illusion in perceived heaviness induced by the time offset between visual and haptic contact timing became smaller after participants had been conditioned to the time offset. These results suggests that the illusion found in our experiments was not caused by the physical time offset between force exertion and visual contact but by the perceived time offset between them and/or estimation error in force exertion timing.

Keywords

force illusion, weight perception, temporal perception, temporal adaptation

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DOI

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IMEKO TC

TC18 - Measurement of Human Functions

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