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J Neurophysiol 93: 3605-3614, 2005. First published December 22, 2004; doi:10.1152/jn.01013.2003
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Effect of Saccadic Adaptation on Localization of Visual Targets

Holger Awater1,4, David Burr2,3, Markus Lappe1,4, M. Concetta Morrone2,5 and Michael E. Goldberg6,7

1Lehrstuhl für Allgemeine Zoologie und Neurobiologie, Ruhr Universität, Bochum, Germany; 2Isituto di Neuroscienze del Consiglio Nazionale della Ricera, Pisa; 3Dipartimento di Psicologia, Università di Firenze, Firenze, Italy; 4Abteilung für Psychologie, Münster Universität, Münster, Germany; 5Facultà di Psicologia, Università Vita-Salute San Raffaele, Milano, Italy; 6Mahoney Center for Brain and Behavior, Center for Neurobiology and Behavior, and Departments of Neurology and Psychiatry, Columbia University, New York; and 7New York State Psychiatric Institute, New York, New York

Submitted 21 October 2004; accepted in final form 4 November 2004

Objects flashed briefly around the time of a saccadic eye movement are grossly mislocalized by human subjects, so they appear to be compressed toward the endpoint of the saccade. In this study, we investigate spatial localization during saccadic adaptation to examine whether the focus of compression tends toward the intended saccadic target or at the endpoint of the actual (adapted) movement. We report two major results. First, that peri-saccadic focus of the compression did not occur at the site of the initial saccadic target, but tended toward the actual landing site of the saccade. Second, and more surprisingly, we observed a large long-term perceptual distortion of space, lasting for hundreds of milliseconds. This distortion did not occur over the whole visual field but was limited to a local region of visual space around the saccade target, suggesting that saccadic adaptation induces a visuo-topic remapping of space. The results imply that the mechanisms controlling saccadic adaptation also affect perception of space and point to a strong perceptual plasticity coordinated with the well-documented plasticity of the motor system.

Address for reprint requests and other correspondence: M. E. Goldberg, 1051 Riverside Dr., Unit 87, New York, NY 10027 (e-mail: meg2008{at}columbia.edu)




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