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The current functional state of local neuronal circuits controls the magnitude of a BOLD response to incoming stimuli.

Abstract：

:The purpose of this study was to determine how the history-dependent activation state of neuronal networks controls fMRI signals to incoming stimuli. Simultaneous electrophysiological and blood oxygen level-dependent (BOLD) responses were monitored during stimulation of the perforant pathway with low, high, and again low intensity but, otherwise identical pulse trains. Under three different anesthetics (alpha-chloralose, medetomidine, isoflurane) consecutive low intensity stimulation trains, set just below the threshold for population spike generation to single pulses, yielded a stable BOLD response, although at different magnitudes. The first high intensity train increased the BOLD response under all anesthetics and generated population spikes, with varying amplitudes and latencies (alpha-chloralose, metedomidine) or in a regular pattern (isoflurane). Concurrent to the second high intensity train, the BOLD response became minimal, then slowly increasing with subsequent trains (alpha-chloralose, metedomidine), or immediately rising to a stable level (isoflurane). Second train population spikes became regularized, but at low amplitudes and long latencies that were slowly reversed across trains (alpha-chloralose, medetomidine); while under isoflurane, amplitude and latencies became stabilized with the second train. In comparison to initial stimulation, the final low intensity stimulation trains failed to produce BOLD responses (alpha-chloralose, medetomidine), or left the response unchanged (isoflurane), only reaching stable potentiation of population spikes when under isoflurane. Therefore, the fate of BOLD responses depends on whether a new stable functional state of the intrinsic network can be reached after high intensity stimulation.

journal_name

Neuroimage

journal_title

NeuroImage

authors

Angenstein F,Krautwald K,Scheich H

doi

10.1016/j.neuroimage.2010.01.070

subject

Has Abstract

pub_date

2010-05-01 00:00:00

pages

1364-75

issue

4

eissn

1053-8119

issn

1095-9572

pii

S1053-8119(10)00092-3

journal_volume

50

pub_type

杂志文章

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