Distinct roles for inhibition in spatial and temporal tuning of local edge detectors in the rabbit retina

Sowmya Venkataramani, Michiel Van Wyk, Ilya Buldyrev, Benjamin Sivyer, David I. Vaney, W. Rowland Taylor

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


This paper examines the role of inhibition in generating the receptive-field properties of local edge detector (LED) ganglion cells in the rabbit retina. We confirm that the feed-forward inhibition is largely glycinergic but, contrary to a recent report, our data demonstrate that the glycinergic inhibition contributes to temporal tuning for the OFF and ON inputs to the LEDs by delaying the onset of spiking; this delay was more pronounced for the ON inputs (∼340 ms) than the OFF inputs (∼12 ms). Blocking glycinergic transmission reduced the delay to spike onset and increased the responses to flickering stimuli at high frequencies. Analysis of the synaptic conductances indicates that glycinergic amacrine cells affect temporal tuning through both postsynaptic inhibition of the LEDs and presynaptic modulation of the bipolar cells that drive the LEDs. The results also confirm that presynaptic GABAergic transmission contributes significantly to the concentric surround antagonism in LEDs; however, unlike presumed LEDs in the mouse retina, the surround is only partly generated by spiking amacrine cells.

Original languageEnglish (US)
Article numbere88560
JournalPloS one
Issue number2
StatePublished - Feb 21 2014
Externally publishedYes

ASJC Scopus subject areas

  • General


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