Effects of perceptual context on transsaccadic visual matching.
Transsaccadic visual matching refers to the phenomenon in which presaccadic signals at the location of the sacccade goal influence the visibility of postsaccadic test signals presented at the fovea (Jüttner & Röhler, 1993). The present study uses variations of the perceptual context, provided by the structure of the presaccadic stimulus display, to investigate the influence of spatial information, decision factors, and visual attention on this form of transsaccadic information processing. The experiments yielded the following results: First, analysis of the data in terms of signal detection theory revealed that transsaccadic visual matching manifests in a shift of decision criterion (beta) rather than in a change of sensory sensitivity (d'). The criterion shift leads to a suppression of postsaccadic stimulus information that is incompatible with presaccadic processed information. Second, the matching effect strongly depends on the structure of the presaccadic display, which suggests that mechanisms of visual attention provide the spatial binding of pre- and postsaccadic stimulus information. Third, transsaccadic matching is phenomenologically tied to the execution of the saccade and effective during a postsaccadic period extending up to 160 msec after termination of the eye movement. These findings indicate a form of context-sensitive evaluation process that could subsidize the maintenance of visual stability.
Jüttner
M
M
Institute for Medical Psychology, University of Munich, Germany. martin@groucho.imp.med.uni-muenchen.de
D005403:Fixation, Ocular; D006801:Humans; D012438:Saccades; D014796:Visual Perception