The effect of immediately preceding task brightness on visual performance.

To determine how visual performance at low photopic brightness levels is affected by the brightness of an immediately preceding visual task, Ss were required to read photographs of banks of instrument dials (a near-vision task) and banks of Landolt rings (a far-vision task) after adaptation to the brightness level of the first task, under speed and accuracy instructions. The Ss performed both the near and far tasks. Within the brightness ranges used, performance was related to the brightness of the task but not to the brightness of the immediately preceding task. (PsycINFO Database Record (c) 2010 APA, all rights reserved)