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Orientation and Direction Tuning of Goldfish Ganglion Cells

Published online by Cambridge University Press:  02 June 2009

Joseph Bilotta  and
Israel Abramov
Joseph Bilotta
Affiliation:
Visual Research Laboratory, Department of Psychology, Brooklyn College of CUNY, Brooklyn, New York
Israel Abramov
Affiliation:
Visual Research Laboratory, Department of Psychology, Brooklyn College of CUNY, Brooklyn, New York
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Abstract

Orientation and direction tuning were examined in goldfish ganglion cells by drifting sinusoidal gratings across the receptive field of the cell. Each ganglion cell was first classified as X-, Y- or W-like based on its responses to a contrast-reversal grating positioned at various spatial phases of the cell's receptive field. Sinusoidal gratings were drifted at different orientations and directions across the receptive field of the cell; spatial frequency and contrast of the grating were also varied. It was found that some X-like cells responded similarly to all orientations and directions, indicating that these cells had circular and symmetrical fields. Other X-like cells showed a preference for certain orientations at high spatial frequencies suggesting that these cells possess an elliptical center mechanism (since only the center mechanism is sensitive to high spatial frequencies). In virtually all cases, X-like cells were not directionally tuned. All but one Y-like cell displayed orientation tuning but, as with X-like cells, orientation tuning appeared only at high spatial frequencies. A substantial portion of these Y-like cells also showed a direction preference. This preference was dependent on spatial frequency but in a manner different from orientation tuning, suggesting that these two phenomena result from different mechanisms. All W-like cells possessed orientation and direction tuning, both of which depended on the spatial frequency of the stimulus. These results support past work which suggests that the center and surround components of retinal ganglion cell receptive fields are not necessarily circular or concentric, and that they may actually consist of smaller subareas.

Keywords

Goldfish ganglion cellOrientation tuningDirection tuning
Type
Research Articles
Information
Visual Neuroscience , Volume 2 , Issue 1 , January 1989 , pp. 3 - 13
Copyright
Copyright © Cambridge University Press 1989

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