Contrast gain in the brain.
Human sensory systems have the remarkable ability of adjusting sensitivity to the surrounding environment. In this issue of Neuron, Gardner and colleagues used fMRI to show how the visual system shifts its sensitivity to contrast. This process may be helpful for keeping the appearance of contrast constant across a range of spatial frequencies.
Boynton
Geoffrey M
GM
the Salk Institute, La Jolla, California 92037, USA.
D000221:Adaptation, Ocular / Q000502:physiology*; D015350:Contrast Sensitivity / Q000502:physiology*; D006801:Humans; D010775:Photic Stimulation; D010786:Photoreceptor Cells / Q000502:physiology; D014793:Visual Cortex / Q000502:physiology*; D014795:Visual Pathways / Q000502:physiology*