Abstract
When viewing a scene or searching for a target, an observer usually makes a series of saccades that quickly shift the orientation of the eyes. The present study explored how one saccade affects subsequent saccades within a dynamic neural field model of the superior colliculus (SC). The SC contains an oculocentric motor map that encodes the vector of saccades and remaps to the new fixation location after each saccade. Our simulations demonstrated that the observation that saccades which reverse their vectors are slower to initiate than those which repeat vectors can be explained by the afore-mentioned remapping process and the internal dynamics of the SC. How this finding connects to the study of inhibition of return is discussed and suggestions for future studies are presented.
Highlights
When viewing a scene or searching for a target, an observer makes a series of rapid eye movements interspersed by short intervals during which the eyes remain still
M. (2011) Aftereffects of Saccades Explored in a Dynamic Neural Field Model of the Superior Colliculus further away
M. (2011) Aftereffects of Saccades Explored in a Dynamic Neural Field Model of the Superior Colliculus consequence is similar to the IOR “effect” observed in the cue-target paradigm
Summary
When viewing a scene or searching for a target, an observer makes a series of rapid eye movements (saccades) interspersed by short intervals during which the eyes remain still. Humans, on average, make 3-4 saccades per second. This unique eye movement behavior is ecologically important as it shifts the orientation of the eyes and brings visual information to the most sensitive part of the eye (i.e., fovea) for detailed processing. Neurophysiological and computational efforts have greatly advanced our understanding of the underlying mechanisms of saccade generation. We asked a slightly different theoretical question. This question was explored within a dynamic neural field (DNF) model of the superior colliculus (SC), which is a key component of the oculomotor system How does one saccade affect the generation of subsequent saccades, or, what are the after effects of saccades? This question was explored within a dynamic neural field (DNF) model of the superior colliculus (SC), which is a key component of the oculomotor system
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