Figure 1
From: Visual motion information modulates tactile roughness perception
Schematic illustrations of the experimental setups and stimuli. (a) Tactile stimuli (abrasive paper) and participants’ hands were placed on a table. A visual display sat on a hand-made aluminum stand above them. Participants were asked to touch the abrasive paper with their index finger of the right hand moving rightward. (b) Photograph of the experimental setups in Experiments 1, 2, and 3. (c) Visual stimuli used in Experiments 1 and 2. The visual grating stimuli had a low spatial frequency (0.14 cycles per degree). A white marker was presented at the center of the display as a fixation point. A moving red marker was presented as a reference for the participants’ hand movements. In Experiment 4, we presented the same visual stimuli except that the red reference marker for hand movements was not presented. (d) Visual stimuli used in Experiment 3. The grating had a higher spatial frequency (0.70 cycles per degree) than in the other experiments.
