Two-Valuedness of Spinors and Perception by Selective Dynamic Touch
Michael T. Turvey, Claudia Carello, Paula A. Fitzpatrick, Christopher C. Pagano, Endre Erik Kadar · 2019
Research has shown that the spatial abilities of dynamic touch are tied to an object’s inertia tensor defined at a fixed point in the wrist. In Experiment 1, two separate rods were gripped firmly, separated by the thumb. In Experiment 2, the rods for each combination were bolted together at a 30° angle and grasped with the thumb between the two rods. In Experiment 3, the rods were fastened inside a wooden handle which was gripped and wielded as a single object. Selective perception was achieved. Across the three experiments, 46, 61, and 76 cm rods were perceived as 43.6, 60.3, and 76.8 cm, averaged over all combinations. Rods were wielded in the right hand, with motions about the wrist joint Perceived length was indicated by adjusting a visible marker to coincide with the felt location of the tip of the attended rod.