Recalibration of time to contact

Kawase, Toshihiro; Ohishi, Keiichi; Yoneyama, Kazuya; Kambara, Hiroyuki; Koike, Yasuharu

doi:10.1016/j.robot.2011.06.011

Cited by 2 publications

(4 citation statements)

References 16 publications

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“…Let us assume that ball-catching motions are initiated some fixed second in advance of the estimated timing of force exertion. This assumption is supported by other experiments in which the timings of muscle activity and catching motion were found to be consistently initiated a few hundred millisecond before the ball contacts the hand (Lacquaniti and Maioli, 1989; Zago et al, 2004; Hong et al, 2005; Kambara et al, 2011; Kawase et al, 2012). We also assume that the margin between the motion initiation timing and the estimated timing varied among participants, but did not change within a single participant in the three experiments.…”

Section: Resultssupporting

confidence: 60%

“…The estimation of TTC, that is, the time remaining before contact, is required to generate anticipatory motion for the successful catch of a falling ball. The motor command for the catching motion seems to be sent to the muscles in advance of the estimated timing of contact (Lacquaniti and Maioli, 1989; Hong et al, 2005; Kambara et al, 2011; Kawase et al, 2012). It has been proposed that sensorimotor control system is utilizing internal forward model of the body and world to predict sensory signals before actual sensory feedback is acquired (Desmurget and Grafton, 2000; Wolpert and Ghahramani, 2000; Shadmehr et al, 2010).…”

Section: Discussionmentioning

confidence: 99%

“…In addition, we also tested whether weight perception changes as the subjective judgment of simultaneity between visual and haptic stimuli changes. In our previous experiment (Kawase et al, 2012), we showed that participants’ judgment of temporal simultaneity was modified by experiencing tens of ball-catching trials in which the load force was applied with constant shifts from the time of visual contact. For example, when participants were persistently exposed to a 60 ms lag in load force timing, the point of subjective simultaneity (the relative time offset between visual and haptic stimuli at which the two stimuli are perceived as simultaneous) shifted in the direction of exposed lag.…”

Section: Introductionmentioning

confidence: 87%

“…To catch a ball falling from above, it is necessary to estimate the time when the ball will contact the hand in order to generate counteracting force at an appropriate timing (Lacquaniti and Maioli, 1989). Through a series of experiments in which participants caught a falling ball in a virtual reality environment (Hong et al, 2005; Kambara et al, 2011; Kawase et al, 2012), we investigated the neural mechanism underlying the estimation of time-to-contact (TTC), that is, the time remaining before contact. During these experiments, some participants happened to report that the weight of the falling ball was perceived differently when their TTC estimations were incorrect, even though the magnitude of force exerted on the hand was constant.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

The Effect of Temporal Perception on Weight Perception

Kambara¹,

Shin²,

Kawase³

et al. 2013

Front. Psychol.

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A successful catch of a falling ball requires an accurate estimation of the timing for when the ball hits the hand. In a previous experiment in which participants performed ball-catching task in virtual reality environment, we accidentally found that the weight of a falling ball was perceived differently when the timing of ball load force to the hand was shifted from the timing expected from visual information. Although it is well known that spatial information of an object, such as size, can easily deceive our perception of its heaviness, the relationship between temporal information and perceived heaviness is still not clear. In this study, we investigated the effect of temporal factors on weight perception. We conducted ball-catching experiments in a virtual environment where the timing of load force exertion was shifted away from the visual contact timing (i.e., time when the ball hit the hand in the display). We found that the ball was perceived heavier when force was applied earlier than visual contact and lighter when force was applied after visual contact. We also conducted additional experiments in which participants were conditioned to one of two constant time offsets prior to testing weight perception. After performing ball-catching trials with 60 ms advanced or delayed load force exertion, participants’ subjective judgment on the simultaneity of visual contact and force exertion changed, reflecting a shift in perception of time offset. In addition, timing of catching motion initiation relative to visual contact changed, reflecting a shift in estimation of force timing. We also found that participants began to perceive the ball as lighter after conditioning to 60 ms advanced offset and heavier after the 60 ms delayed offset. These results suggest that perceived heaviness depends not on the actual time offset between force exertion and visual contact but on the subjectively perceived time offset between them and/or estimation error in force timing.

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