Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Traditionally reported hyperemia of the visual cortex to light stimulation in humans. (a) Middle cerebral artery blood velocity (MCAv), and posterior cerebral artery blood velocity (PCAv) during repetitive cycles of light exposure and darkness to the retina. Data is presented as relative changes. (b) Average responses to at least 16 repetitive dark and light sequences from each of 10 normal individuals for MCAv and PCAv. Figure adapted from Aaslid.85
