A Caltech Library Service

A Contrast Sensitive Silicon Retina with Reciprocal Synapses

Boahen, Kwabena A. and Andreou, Andreas G. (1992) A Contrast Sensitive Silicon Retina with Reciprocal Synapses. In: Advances in Neural Information Processing Systems 4 (NIPS 1991). Advances in Neural Information Processing Systems. No.4. Morgan Kaufmann , San Mateo, CA, pp. 764-770. ISBN 1-55860-222-4.

[img] PDF - Published Version
See Usage Policy.


Use this Persistent URL to link to this item:


The goal of perception is to extract invariant properties of the underlying world. By computing contrast at edges, the retina reduces incident light intensities spanning twelve decades to a twentyfold variation. In one stroke, it solves the dynamic range problem and extracts relative reflectivity, bringing us a step closer to the goal. We have built a contrast-sensitive silicon retina that models all major synaptic interactions in the outer-plexiform layer of the vertebrate retina using current-mode CMOS circuits: namely, reciprocal synapses between cones and horizontal cells, which produce the antagonistic center/surround receptive field, and cone and horizontal cell gap junctions, which determine its size. The chip has 90 x 92 pixels on a 6.8 x 6.9mm die in 2μm n-well technology and is fully functional.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Additional Information:© 1992 Morgan Kaufmann.
Series Name:Advances in Neural Information Processing Systems
Issue or Number:4
Record Number:CaltechAUTHORS:20160119-165146283
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:63786
Deposited On:20 Jan 2016 00:56
Last Modified:03 Oct 2019 09:31

Repository Staff Only: item control page