Figure 2. Background adaptation of lamprey rods.

Responses to 20 ms flashes at 500 nm, 2 min after exposure to background light. Data are means of 5 flashes from each of 8 cells; for each cell the entire series was recorded. A–D, flash intensities were (in Rh^*) 3, 13, 31, 117, 338 and 829; and E–F, 3, 13, 31, 117, 338, 829 and 3150. Red traces are responses to 31 Rh^*. Background intensities were as follows (in Rh^* s⁻¹): A, dark‐adapted (no background); B, 12; C, 32; D, 122; E, 330; and F, 1190. [Color figure can be viewed at wileyonlinelibrary.com]