Contextual tuning of direction-selective retinal ganglion cells (original) (raw)

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Authors and Affiliations

  1. Howard Hughes Medical Institute, Massachusetts General Hospital, Harvard Medical School, 50 Blossom Street, Wellman 429, Boston, 02114, Massachusetts, USA
    Chuan-Chin Chiao & Richard H Masland
  2. Department of Life Science, National Tsing Hua University, Hsinchu, 300, Taiwan
    Chuan-Chin Chiao

Authors

  1. Chuan-Chin Chiao
  2. Richard H Masland

Corresponding author

Correspondence toRichard H Masland.

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The authors declare no competing financial interests.

Supplementary information

Supplementary Fig. 1. (download PDF )

Suppression of the center response by an optic flow stimulus. Since stimulation of the surround does not, by itself, cause responses from the ganglion cell, it is often termed a suppressive or silent surround. Such inhibitory surrounds, tested by Werblin and later investigators using windmill stimuli, are a general feature of many retinal ganglion cells in cold-blooded vertebrates and in the cat 1-3. We confirmed that a classic silent surround exists for the On-Off direction selective cell, using windmill stimuli (Supplementary Fig. 2) and this standard optic flow stimulus. The firing of the DS cell is depressed by the presence of a moving background, but the density and direction of the movement have little effect. The center of the receptive field was stimulated by a square wave grating (1.88 cycle/mm) moving in the preferred direction at 1.88 Hz. The surround of the receptive field was stimulated by random dots moving coherently at the same speed as the center grating in one of eight directions. Conventions as in figure 1. The responses are normalized to the maximum of each cell's response to the center stimulus presented alone. Data points show mean ± s.e.m. for 10 cells. 1. Werblin, F.S. Science 175, 1008-1010 (1972). 2. Werblin, F.S., Maguire, G.W., Lukasiewicz, S.R., Eliasof, S.R. & Wu, S. Vis. Neurosci. 1, 317-329 (1988). 3. Enroth-Cugell,C. & Jakiela,H.G. J. Physiol. 302, 49-72 (1980). (PDF 159 kb)

Supplementary Fig. 2. (download PDF )

Spatial resolution of the inhibitory subunit. In our experiments, the inhibitory effect of the surround stimulus appeared to be quite local. A surround grating shifted by 180° from the center stimulates virtually the same total area of the surround as one in phase with the center, yet the in-phase grating inhibits the response and the out-of-phase grating does not. Thus, the inhibitory subunit in our experiments appears to make its outputs only in its own immediate vicinity. The effects of the annular masks suggest that the subunit in these experiments has a diameter of ≃200 μm. This conclusion is consistent with the result illustrated here, where windmill vanes lost their effectiveness at a width finer than ≃200 μm. This subunit is smaller than the total size of the receptive field and dendritic field of the DS ganglion cell, which occupy ≃500 μm at the retinal eccentricity studied. This level of spatial resolution and the lack of spatial pooling both suggest that the synaptic inhibition occurs in the inner retina (the horizontal cell network spreads too widely to account for a 200 μm subunit), presumably mediated by a medium-field amacrine cell. Conventions as in figures 1-4, scale bar 500 μm. Responses are normalized to the response to the center alone. Mean ± s.e.m. for 12 cells. (PDF 90 kb)

Supplementary Methods (PDF 11 kb) (download PDF )

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Chiao, CC., Masland, R. Contextual tuning of direction-selective retinal ganglion cells.Nat Neurosci 6, 1251–1252 (2003). https://doi.org/10.1038/nn1147

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