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An Electronic Photoreceptor Sensitive to Small Changes in Intensity

Delbrück, T. and Mead, C. A. (1989) An Electronic Photoreceptor Sensitive to Small Changes in Intensity. In: Advances in Neural Information Processing Systems. Vol.1. Morgan Kaufmann Publishers , San Mateo, CA, pp. 720-727. ISBN 1558600159.

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We describe an electronic photoreceptor circuit that is sensitive to small changes in incident light intensity. The sensitivity to changes in the intensity is achieved by feeding back to the input a filtered version of the output. The feedback loop includes a hysteretic element. The circuit behaves in a manner reminiscent of the gain control properties and temporal responses of a variety of retinal cells, particularly retinal bipolar cells. We compare the thresholds for detection of intensity increments by a human and by the circuit. Both obey Weber's law and for both the temporal contrast sensitivities are nearly identical.

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Additional Information:© 1989 Morgan Kaufmann. This work was supported by the System Development Foundation and the Office of Naval Research. Chips were fabricated through the MOSIS foundry. We thank Frank Werblin for helpful comments and Mary Ann Maher for editorial assistance.
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System Development FoundationUNSPECIFIED
Office of Naval Research (ONR)UNSPECIFIED
Record Number:CaltechAUTHORS:20141212-141111206
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:52775
Deposited On:12 Dec 2014 22:58
Last Modified:03 Oct 2019 07:44

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