Pushing it to the Limit: Adaptation With Dynamically Switching Gain Control

Details Pushing it to the Limit: Adaptation With Dynamically Switching Gain Control Pushing it to the Limit: Adaptation With Dynamically Switching Gain Control

2006-07-10

arxiv.org/abs/q-bio/0607013v1

Biology

Quantitative Biology

Neurons and Cognition

10 pages,11 figures. This manuscript (co-authored with Jordi Vitria) has been submitted to "EURASIP Journal on Applied Signal

Scientific paper

With this paper we propose a model to simulate the functional aspects of light adaptation in retinal photoreceptors. Our model, however, does not link specific stages to the detailed molecular processes which are thought to mediate adaptation in real photoreceptors. We rather model the photoreceptor as a self-adjusting integration device, which adds up properly amplified luminance signals. The integration process and the amplification obey a switching behavior that acts to locally shut down the integration process in dependence on the internal state of the receptor. The mathematical structure of our model is quite simple, and its computational complexity is quite low. We present results of computer simulations which demonstrate that our model adapts properly to at least four orders of input magnitude.

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