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Closed-Loop Measurements of Iso-Response Stimuli Reveal Dynamic Nonlinear Stimulus Integration in the Retina

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http://pubman.mpdl.mpg.de/cone/persons/resource/persons49474

Bölinger,  Daniel
Max Planck Research Group: Visual Coding / Gollisch, MPI of Neurobiology, Max Planck Society;
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http://pubman.mpdl.mpg.de/cone/persons/resource/persons38858

Gollisch,  Tim
Max Planck Research Group: Visual Coding / Gollisch, MPI of Neurobiology, Max Planck Society;
External Organizations;

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Citation

Bölinger, D., & Gollisch, T. (2012). Closed-Loop Measurements of Iso-Response Stimuli Reveal Dynamic Nonlinear Stimulus Integration in the Retina. NEURON, 73(2), 333-346. doi:10.1016/j.neuron.2011.10.039.


Cite as: http://hdl.handle.net/11858/00-001M-0000-000F-50C4-9
Abstract
Neurons often integrate information from multiple parallel signaling streams. How a neuron combines these inputs largely determines its computational role in signal processing. Experimental assessment of neuronal signal integration, however, is often confounded by cell-intrinsic nonlinear processes that arise after signal integration has taken place. To overcome this problem and determine how ganglion cells in the salamander retina integrate visual contrast over space, we used automated online analysis of recorded spike trains and closed-loop control of the visual stimuli to identify different stimulus patterns that give the same neuronal response. These iso-response stimuli revealed a threshold-quadratic transformation as a fundamental nonlinearity within the receptive field center. Moreover, for a subset of ganglion cells, the method revealed an additional dynamic nonlinearity that renders these cells particularly sensitive to spatially homogeneous stimuli. This function is shown to arise from a local inhibition-mediated dynamic gain control mechanism.