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Retinal bipolar cells: Temporal filtering of signals from cone photoreceptors

Published online by Cambridge University Press:  20 December 2007

DWIGHT A. BURKHARDT ,
PATRICK K. FAHEY  and
MICHAEL A. SIKORA
DWIGHT A. BURKHARDT
Affiliation:
Departments of Psychology and Graduate Program in Neuroscience, University of Minnesota, Minneapolis, Minnesota
PATRICK K. FAHEY
Affiliation:
Departments of Psychology and Graduate Program in Neuroscience, University of Minnesota, Minneapolis, Minnesota
MICHAEL A. SIKORA
Affiliation:
Departments of Psychology and Graduate Program in Neuroscience, University of Minnesota, Minneapolis, Minnesota
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Abstract

The temporal dynamics of the response of neurons in the outer retina were investigated by intracellular recording from cones, bipolar, and horizontal cells in the intact, light-adapted retina of the tiger salamander (Ambystoma tigrinum), with special emphasis on comparing the two major classes of bipolars cells, the ON depolarizing bipolars (Bd) and the OFF hyperpolarizing bipolars (Bh). Transfer functions were computed from impulse responses evoked by a brief light flash on a steady background of 20 cd/m2. Phase delays ranged from about 89 ms for cones to 170 ms for Bd cells, yielding delays relative to that of cones of about 49 ms for Bh cells and 81 ms for Bd cells. The difference between Bd and Bh cells, which may be due to a delay introduced by the second messenger G-protein pathway unique to Bd cells, was further quantified by latency measurements and responses to white noise. The amplitude transfer functions of the outer retinal neurons varied with light adaptation in qualitative agreement with results for other vertebrates and human vision. The transfer functions at 20 cd/m2 were predominantly low pass with 10-fold attenuation at about 13, 14, 9.1, and 7.7 Hz for cones, horizontal, Bh, and Bd cells, respectively. The transfer function from the cone voltage to the bipolar voltage response, as computed from the above measurements, was low pass and approximated by a cascade of three low pass RC filters (“leaky integrators”). These results for cone→bipolar transmission are surprisingly similar to recent results for rod→bipolar transmission in salamander slice preparations. These and other findings suggest that the rate of vesicle replenishment rather than the rate of release may be a common factor shaping synaptic signal transmission from rods and cones to bipolar cells.

Keywords

Retinal Bipolar CellsCone PhotoreceptorsHorizontal CellsTemporal Transfer FunctionsLight AdaptationWhite Noise
Type
Research Article
Information
Visual Neuroscience , Volume 24 , Issue 6 , November 2007 , pp. 765 - 774
Copyright
2007 Cambridge University Press

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