Independent effects of pictorial displays on perception and action.
Although pictorial illusions have been used to study perception for a long time, the effects of such displays on the visual control of actions has recently been the matter of some debate. Evidence from a re-analysis of an earlier study is presented that suggests pictorial displays can exert opposite effects on perceptual size judgements and grip scaling, perhaps because the two-dimensional elements surrounding the target for a grasp are treated as potential obstacles. This interpretation was supported by the results of an experiment in which the relative position and distance of two-dimensional elements flanking a target had differential effects on perceptual judgements of size and the scaling of grip aperture.
Haffenden
A M
AM
Department of Psychology, Vision and Motor Control Laboratory, University of Western Ontario, London, Canada.
Goodale
M A
MA
D006225:Hand / Q000502:physiology; D006801:Humans; D009068:Movement / Q000502:physiology*; D009903:Optical Illusions / Q000502:physiology*; D010775:Photic Stimulation / Q000379:methods; D011597:Psychomotor Performance / Q000502:physiology*; D014796:Visual Perception / Q000502:physiology*