Chapter

Retina: Microcircuits for Daylight, Twilight, and Starlight

Jonathan B. Demb

in Handbook of Brain Microcircuits

Published on behalf of Oxford University Press

Published in print August 2010 | ISBN: 9780195389883
Published online September 2012 | e-ISBN: 9780199965137 | DOI: http://dx.doi.org/10.1093/med/9780195389883.003.0018
Retina: Microcircuits for Daylight, Twilight, and Starlight

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This chapter discusses microcircuits for daylight, twilight, and starlight. Over the course of the day, light intensity shifts by 10 billion-fold, but a ganglion cell's spike rate can vary only by 100-fold. To cover the huge intensity range, two fundamentally different circuits are required: a cone bipolar circuit for graded photoreceptor signals, and a rod bipolar circuit for binary signals. By using gap junctions, the two circuits can share key components.

Chapter.  2510 words.  Illustrated.

Subjects: Development of the Nervous System

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