3 ms·
Indirectly. The idea is that when cell metabolic rate increases, the brain's circulatory system compensates by dilating vessels to increase flow to that area. (
by foobarbecue 4y ago
Indirectly. The idea is that when cell metabolic rate increases, the brain's circulatory system compensates by dilating vessels to increase flow to that area. (EDIT: this is wrong, see below)
- thfuran 4y agoBut the fmri is measuring change in decay time caused by change in blood oxygenation rather than change in flow rate, right? And that's a relatively direct measure of local metabolic activity (at least for some metabolic pathways).
- foobarbecue 4y agoYou're right, and I didn't know that. Thanks for educating me. Apparently it's called BOLD-contrast imaging. Time for me to go read about haemodynamic response since I didn't know that was a thing.