Abnormal brain default-mode network functional connectivity in drug addicts
N Ma, Y Liu, XM Fu, N Li, CX Wang, H Zhang, RB Qian… - PloS one, 2011 - journals.plos.org
N Ma, Y Liu, XM Fu, N Li, CX Wang, H Zhang, RB Qian, HS Xu, X Hu, DR Zhang
PloS one, 2011•journals.plos.orgBackground The default mode network (DMN) is a set of brain regions that exhibit
synchronized low frequency oscillations at resting-state, and is believed to be relevant to
attention and self-monitoring. As the anterior cingulate cortex and hippocampus are
impaired in drug addiction and meanwhile are parts of the DMN, the present study examined
addiction-related alteration of functional connectivity of the DMN. Methodology Resting-state
functional magnetic resonance imaging data of chronic heroin users (14 males, age …
synchronized low frequency oscillations at resting-state, and is believed to be relevant to
attention and self-monitoring. As the anterior cingulate cortex and hippocampus are
impaired in drug addiction and meanwhile are parts of the DMN, the present study examined
addiction-related alteration of functional connectivity of the DMN. Methodology Resting-state
functional magnetic resonance imaging data of chronic heroin users (14 males, age …
Background
The default mode network (DMN) is a set of brain regions that exhibit synchronized low frequency oscillations at resting-state, and is believed to be relevant to attention and self-monitoring. As the anterior cingulate cortex and hippocampus are impaired in drug addiction and meanwhile are parts of the DMN, the present study examined addiction-related alteration of functional connectivity of the DMN.
Methodology
Resting-state functional magnetic resonance imaging data of chronic heroin users (14 males, age: 30.1±5.3 years, range from 22 to 39 years) and non-addicted controls (13 males, age: 29.8±7.2 years, range from 20 to 39 years) were investigated with independent component analysis to address their functional connectivity of the DMN.
Principal Findings
Compared with controls, heroin users showed increased functional connectivity in right hippocampus and decreased functional connectivity in right dorsal anterior cingulate cortex and left caudate in the DMN.
Conclusions
These findings suggest drug addicts' abnormal functional organization of the DMN, and are discussed as addiction-related abnormally increased memory processing but diminished cognitive control related to attention and self-monitoring, which may underlie the hypersensitivity toward drug related cues but weakened strength of cognitive control in the state of addiction.
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