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Positive and negative BOLD-signals from blood vessels in monkey visual cortex

MPS-Authors
http://pubman.mpdl.mpg.de/cone/persons/resource/persons83937

Goense,  JBM
Department Physiology of Cognitive Processes, Max Planck Institute for Biological Cybernetics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons84063

Logothetis,  NK
Department Physiology of Cognitive Processes, Max Planck Institute for Biological Cybernetics, Max Planck Society;

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Citation

Goense, J., & Logothetis, N. (2008). Positive and negative BOLD-signals from blood vessels in monkey visual cortex. Poster presented at 16th Scientific Meeting and Exhibition of the International Society of Magnetic Resonance in Medicine (ISMRM 2008), Toronto, Canada.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0013-C99F-A
Abstract
High-resolution fMRI can aid in determining to what extent the BOLD signal arises from capillaries or larger vessels. In high-resolution functional activation maps both positive and negative BOLD signals associated with vessels were observed; this was seen for both GE- and SE-BOLD. Because of its higher specificity, the SE-BOLD signal was used to investigate the origin of these vessel signals. The location of the SE-BOLD signal from veins changed when the direction of the gradients was changed. This is in contrast to the peak SE-BOLD occurring in layer IV which arises from capillaries, and was insensitive to gradient reversal.