Abstract
Primates have relatively small foveas within their retinas. There are sufficient photoreceptors only in the fovea to allow high spatial resolution vision. Thus, to obtain high-resolution images in the entire visual field, there is a need to point the fovea at targets of interest, and this is achieved using saccadic eye movements. Humans make around three saccades per second. How is smooth, uninterrupted visual perception maintained in the face of the frequent image displacements generated by saccades? It has been known for many years that visual perception is modified before, during, and after saccades and, more recently, evidence has accumulated showing how neural activity is also modulated. This review will describe some of the recent electrophysiological work that shows how neural activity in the visual brain changes at the time of saccades. The review is divided into three sections. The first section describes theories relating to the saccadic suppression and some of the neural evidence to support and refute those theories. The second section describes the recently discovered alterations to the timing of visual responses in the nervous system. It turns out that the latencies of visual responses are reduced at the time of saccades, providing possible explanations for the changes in the time perception that have been observed. The third section describes how neural responsiveness is increased after saccades. Recent findings have shown that when visual stimuli are presented within the receptive fields of visual neurons soon after saccades, responses are larger than that occurring in the absence of saccades. This enhanced responsiveness persists for approximately the same duration as typical intersaccadic periods. Thus, visual responsiveness is normally enhanced between saccades. Conversely, during long periods of fixation visual sensitivity is relatively low. These latter findings suggest that the motor and visual systems work closely together to maximize the sensitivity and efficiency of the visual system.
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Acknowledgments
Some of the work presented here was conducted using funds from the Australian Research Council Centre of Excellence in Vision Science (CE0561903) and two NIH grants (EY06069; RR0165). Thanks go to Professor Mustari, Drs Cloherty, Price, Crowder, Hietanen and Ono and to Tracey Broznya, Katia Peixoto and Anthony Gazy for help with experiments and animal care.
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Ibbotson, M.R. (2009). Intrasaccadic Motion: Neural Evidence for Saccadic Suppression and Postsaccadic Enhancement. In: Ilg, U., Masson, G. (eds) Dynamics of Visual Motion Processing. Springer, Boston, MA. https://doi.org/10.1007/978-1-4419-0781-3_11
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DOI: https://doi.org/10.1007/978-1-4419-0781-3_11
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