ABSTRACT
Whatever the different mechanisms involved in motion perception, evidence from neuropsychology shows that defects in motion perception dissociate from defects in colour and form recognition. Primarily though, masking procedures allow the experimenter tight control over the relations between consecutive images—their visual and spatial relations, how quickly they follow one another, etc. Masking thus provides an experimental tool to prise open otherwise hidden aspects of dynamic vision. Integration masking may occur because of the poor temporal resolution of the visual system, which sums signals over time. Normally, integration is beneficial to vision, enhancing the perception of a coherent world when successive images contain the same stimuli. Breitmeyer and Ganz argue that various interactions can occur between targets and masks, both within a processing channel or across channels. This creates different masking effects. Breitmeyer and Ganz propose that peripheral masking is best conceptualised as within-channel inhibition.
