title: No perisaccadic mislocalization with abruptly cancelled saccades.
abstract: Every saccadic eye movement that we make changes the image of the world on our retina. Yet, despite these retinal shifts, we still perceive our visual world to be stable. Efference copy from the oculomotor system to the visual system has been suggested to contribute to this stable percept, enabling the brain to anticipate the retinal image shifts by remapping the neural image. A psychophysical phenomenon that has been linked to this predictive remapping is the mislocalization of a stimulus flashed around the time of a saccade. If this mislocalization is initiated by saccade preparation, one should also observe localization errors when a saccade is planned, but abruptly aborted just before its execution. We tested this hypothesis in human subjects using a novel paradigm that combines a flash localization task with a countermanding component that occasionally requires saccade cancellation. Surprisingly, we found no trace of mislocalization, even for saccades cancelled close to the point of no return. This strongly suggests that the actual execution of the saccade is a prerequisite for the typical localization errors, which rejects various models and constrains neural substrates. We conclude that perisaccadic mislocalization is not a direct consequence of saccade preparation, but arises after saccade execution when the flash location is constructed from memory.
authors.affiliation: Donders Institute for Brain, Cognition and Behaviour, Radboud University Nijmegen, Nijmegen 6500 HB, The Netherlands, University of Birmingham, School of Psychology, Birmingham B15 2TT, West Midlands, United Kingdom, and Departments of Physiology and Pharmacology, Psychology, and Robarts Research Institute, Western University, London, Ontario N6A 5B7, Canada.
authors.forename: Jeroen
authors.initials: J
authors.lastname: Atsma
authors.forename: Femke
authors.initials: F
authors.lastname: Maij
authors.forename: Brian D
authors.initials: BD
authors.lastname: Corneil
authors.forename: W Pieter
authors.initials: WP
authors.lastname: Medendorp
mesh_terms: D000328:Adult; D000704:Analysis of Variance; D005260:Female; D007839:Functional Laterality / Q000502:physiology; D006801:Humans; D007266:Inhibition, Psychological; D008297:Male; D016011:Normal Distribution; D010775:Photic Stimulation; D011601:Psychophysics; D011930:Reaction Time / Q000502:physiology; D012438:Saccades / Q000502:physiology*; D014796:Visual Perception / Q000502:physiology*; D055815:Young Adult
keywords: countermanding; perisaccadic mislocalization; remapping; saccade preparation; visual stability
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