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Vision Res. Vol. 22, pp. 1299 to 1312, 1982 0042-6989/82/101299-14$03.00/0 Printed in Great Britain Pergamon Press Ltd
 

Summary: Vision Res. Vol. 22, pp. 1299 to 1312, 1982 0042-6989/82/101299-14$03.00/0
Printed in Great Britain Pergamon Press Ltd
SATURATION AND ADAPTATION IN THE
ROD SYSTEM
Edward H. Adelson*
Vision Research Laboratory, University of Michigan, Department of Psychology, Ann Arbor, MI 48109, U.S.A.
(Received 16 July 1881; in revised form 5 March 1982)
Abstract--A background that is briefly flashed to a dark-adapted eye saturates the rod system. This
transient saturation occurs with backgrounds that are as much as 2 log units dimmer than those
producing saturation under steady viewing. Rod threshold is highest when the background is first turned
on, and falls as adaptation proceeds. The nature of the adaptive processes are studied by presenting
flashed backgrounds on pre-adapting fields. The data can be interpreted in terms of two adaptive
processes: the first is multiplicative, and occurs rapidly; the second is subtractive, and occurs more
slowly.
INTRODUCTION
The retina is required to function under light levels
that span an enormous range, and to do this effec-
tively it must adapt to whatever ambient light level is
present. In the cone system an important source of
adaptation at high light levels is photopigment

  

Source: Adelson, Edward - Computer Science and Artificial Intelligence Laboratory, Department of Brain and Cognitive Science, Massachusetts Institute of Technology (MIT)

 

Collections: Biology and Medicine