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Coupling of total hemoglobin concentration, oxygenation, and neural activity in rat somatosensory cortex.

Abstract：

:Recent advances in brain imaging techniques, including functional magnetic resonance imaging (fMRI), offer great promise for noninvasive mapping of brain function. However, the indirect nature of the imaging signals to the underlying neural activity limits the interpretation of the resulting maps. The present report represents the first systematic study with sufficient statistical power to quantitatively characterize the relationship between changes in blood oxygen content and the neural spiking and synaptic activity. Using two-dimensional optical measurements of hemodynamic signals, simultaneous recordings of neural activity, and an event-related stimulus paradigm, we demonstrate that (1) there is a strongly nonlinear relationship between electrophysiological measures of neuronal activity and the hemodynamic response, (2) the hemodynamic response continues to grow beyond the saturation of electrical activity, and (3) the initial increase in deoxyhemoglobin that precedes an increase in blood volume is counterbalanced by an equal initial decrease in oxyhemoglobin.

journal_name

Neuron

journal_title

Neuron

authors

Devor A,Dunn AK,Andermann ML,Ulbert I,Boas DA,Dale AM

doi

10.1016/s0896-6273(03)00403-3

subject

Has Abstract

pub_date

2003-07-17 00:00:00

pages

353-9

issue

2

eissn

0896-6273

issn

1097-4199

pii

S0896627303004033

journal_volume

39

pub_type

杂志文章

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