RT Journal Article
A1 Kucukoglu, Gizem
A1 Maloney, Laurence T
T1 Estimation of angular velocity of objects differing in material is inconsistent
JF Journal of Vision
JO Journal of Vision
YR 2014
DO 10.1167/14.10.1319
VO 14
IS 10
SP 1319
OP 1319
SN 1534-7362
AB  Previously, we demonstrated that there is an interaction between object surface material and perception of angular velocity (Kucukoglu, Maloney, 2013): specular objects were judged to be moving faster than matte (Lambertian) objects matched in rotational velocity. This year we considered three classes of objects: specular, matte, and matte with albedo surface texture. The stimuli were irregular, blob-like shapes rendered with specular, matte or textured materials. Their angular velocity ranged between 6°/sec to 84°/sec. We had three conditions: (1) textured vs. specular, (2) specular vs. matte and (3) textured vs. matte. In all of these conditions, on a given trial subjects saw a pair of rotating objects – e.g. one specular, one textured – presented one after the other. The task was to pick the faster rotating object in the pair. We used a staircase paradigm to adjust the angular velocity of the objects to the point of subjective equal angular velocity.Three out of four subjects in condition 1 show a significant bias in perceiving textured objects to be faster than the specular objects. Condition two is a repetition of our previous task but this time with slower angular velocities. Two out of four subjects in condition 2 show a bias towards perceiving specular objects to be faster than matte objects. If textured is perceived to be faster than specular (A>B) and specular is faster than matte (B>C) we would expect to find a bias towards perceiving textured to be faster than matte (A>C). However, we do not find any significant bias between textured and matte objects (we do not reject A=C for any subject). We present a cue integration model of estimation of angular velocity proposing that dynamic reweighting of different cues to angular velocity accounts for the observed intransitivity. Meeting abstract presented at VSS 2014 
RD 10/27/2020
UL https://doi.org/10.1167/14.10.1319