Saturation and Adaptation in the Rod System
Edward H. Adelson
Vision Research, vol. 22, pp. 1299-1312 (1982).
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.