CURVATURE DISCONTINUITIES DISCRIMINATION DURING DYNAMIC EXPLORATION OF SURFACES
We conducted a two alternative forced choice discrimination experiment to evaluate subjectsâ€™ capability of perceiving curvature discontinuities during a dynamic exploration task. Five 500 mm long templates were milled with different degrees of discontinuity. Discontinuities were
geometrically obtained by varying the curvature radius (base radius) by , while maintaining continuity in tangency in the middle point. On each trial we asked 20 participants to distinguish between a reference continuous curved stimulus and a discontinuous one. Results showed that subjects were able to distinguish the discontinuous
stimulus from the continuous one when occurred a variation of the base radius around
or more. Moreover, we tracked the handâ€™s movements during the stimuli exploration, and correlated the dynamic aspects of the explorations with the proportion of correct response for each level of the stimuli. Results led us to hypothesize that dynamic cues could play a role in curvature discontinuity discrimination.