Panichi M, Morrone M C, Burr D C, Baldassi S, 2010, "Spatiotemporal mechanisms of perisaccadic vision revealed by psychophysical reverse correlation" Perception 39 ECVP Abstract Supplement, page 55
Spatiotemporal mechanisms of perisaccadic vision revealed by psychophysical reverse correlation
M Panichi, M C Morrone, D C Burr, S Baldassi
During saccades visual objects become suppressed, mislocalized and compressed in both space and time. We used Psychophysical Reverse Correlation to probe the spatiotemporal characteristics of perisaccadic suppression and compression. In separate experiments, subjects were asked to detect spatial-frequency defined stimuli in 1D noise (space-only) or luminance defined stimuli in 2D noise (space–time), both during fixation and around the time of saccades. We analyzed the relative power spectrum of the templates and computed the first-order (mean) and second-order (variance) kernels for the two types of stimuli. Results show that suppression implies selective inhibition of low-frequency harmonics of the perceptual template. The dynamics of saccadic compression and mislocalization are complex. For pre- and prismatic targets the template is characterized by early activation preceding the stimulus in both space and time, and by a continuous shift towards later activations, along the spatiotemporal diagonal, for targets presented closer to the saccade landing. We are currently testing several models to account for these effects.
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