Accurate visuomotor control below the perceptual threshold of size discrimination.

ABSTRACT:

Background

Human resolution for object size is typically determined by psychophysical methods that are based on conscious perception. In contrast, grasping of the same objects might be less conscious. It is suggested that grasping is mediated by mechanisms other than those mediating conscious perception. In this study, we compared the visual resolution for object size of the visuomotor and the perceptual system.

Methodology/principal findings

In Experiment 1, participants discriminated the size of pairs of objects once through perceptual judgments and once by grasping movements toward the objects. Notably, the actual size differences were set below the Just Noticeable Difference (JND). We found that grasping trajectories reflected the actual size differences between the obje

SUBMITTER: Ganel T 

PROVIDER: S-EPMC3338698 | biostudies-literature | 2012

REPOSITORIES: biostudies-literature