Role of eye movements in the retinal code for a size discrimination task.

TitleRole of eye movements in the retinal code for a size discrimination task.
Publication TypeJournal Article
Year of Publication2007
AuthorsSegev, R, Schneidman, E, Goodhouse, J, Berry, MJ
JournalJ Neurophysiol
Date Published2007 Sep
KeywordsAnimals, Calibration, Discrimination Learning, Eye Movements, Kinetics, Motion Perception, Optic Nerve, Perciformes, Reaction Time, Retina, Retinal Ganglion Cells, Size Perception, Visual Perception

<p>The concerted action of saccades and fixational eye movements are crucial for seeing stationary objects in the visual world. We studied how these eye movements contribute to retinal coding of visual information using the archer fish as a model system. We quantified the animal's ability to distinguish among objects of different sizes and measured its eye movements. We recorded from populations of retinal ganglion cells with a multielectrode array, while presenting visual stimuli matched to the behavioral task. We found that the beginning of fixation, namely the time immediately after the saccade, provided the most visual information about object size, with fixational eye movements, which consist of tremor and drift in the archer fish, yielding only a minor contribution. A simple decoder that combined information from <or=15 ganglion cells could account for the behavior. Our results support the view that saccades impose not just difficulties for the visual system, but also an opportunity for the retina to encode high quality "snapshots" of the environment.</p>

Alternate JournalJ Neurophysiol
PubMed ID17625063
Grant ListEY-01496 / EY / NEI NIH HHS / United States