ISSN : 1226-9654
Tests show hand movement and hand touch influence the perception of visual motion. However, previous studies tested these two factors independently. This study examined how differently participants might disambiguate ambiguity in visual motion with simultaneous manipulation of hand movement and touch. While participants observed a streaming/bouncing ambiguous motion display, consisting of two disks that moved horizontally, they moved both hands toward each other, along with the two disks, and either returned from the middle or continued, crossing each other, either with or without the hands touching in the middle. The results supported previous studies showing hand crossing induced greater visual streaming perception, while hand touching induced greater visual bouncing perception. However, when both cues conflicted, their effects decreased significantly, suggesting kinesthetic information and cutaneous touch information additionally influence vision. In addition, the results showed hand returning, alone, did not induce visual bouncing perception, suggesting that kinesthetic information may be effective only for motions in which an object moves along a straight or smooth trajectory or only during initiation of the object's motion.
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