1.
Vision Res
; 45(21): 2740-51, 2005 Oct.
Artigo
em Inglês
| MEDLINE
| ID: mdl-16023697
RESUMO
Optic flow generated by rigid surface patches can be decomposed into a small number of elementary motion types. In these experiments, we show that the human visual system can evaluate expansion, one of these motion types, metrically. Moreover, we show that the discrimination of rates of expansion are spatially local. Because the estimation of the focus of expansion is somewhat imprecise, this locality sometimes produces predictable errors in the estimation of rate of expansion. One can make predictions like this with a model adapted from one previously developed for angular-velocity discrimination.