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The Journal of Neuroscience, January 4, 2006, 26(1):12-20; doi:10.1523/JNEUROSCI.2407-05.2006

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Behavioral/Systems/Cognitive
Mislocalization of Perceived Saccade Target Position Induced by Perisaccadic Visual Stimulation

Holger Awater^1,2 and Markus Lappe¹

¹Psychological Institute II, Westfalian Wilhelms-University, 48149 Muenster, Germany, and ²Department of Psychology, Vanderbilt University, Nashville, Tennessee 37212

The perceptual localization of objects flashed at the time of a saccade often shows large spatial distortions. These perisaccadic mislocalizations exhibit different spatial patterns depending on the experimental condition. In darkness, when only extraretinal information is available, mislocalization is spatially uniform. In light and when visual references are available, mislocalization is directed toward the saccade target, resembling a compression of visual space. These patterns are derived from measurements of the absolute perceived position of the flashed object in egocentric space. Here, we report that also the perceived location of the saccade target is altered when an object is flashed perisaccadically. The mislocalization of the target depends on the presentation time of the flashed object and is directed toward the position of the flash. The resulting compression of the relative distance between target and flash is similar in darkness and in light and can also be found during fixation. When the localization of the flashed object is described relative to the perceived location of the saccade target, spatial compression becomes similar in many experimental conditions. We therefore suggest that perisaccadic compression relies on an encoding of relative spatial locations of objects rather than on localizations in egocentric space.

Key words: eye movement; saccade; spatial perception; visual perception; human; spatial localization

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Received June 13, 2005; revised October 31, 2005; accepted November 1, 2005.

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