( development |
functional MRI |
spontaneous activity )
Edited by Jean-Pierre Changeux, Institut Pasteur, Paris, France, and approved August 15, 2007 (received for review May 11, 2007) In the absence of any overt task performance, it has been shown that spontaneous, intrinsic brain activity is expressed as systemwide, resting-state networks in the adult brain. However, the route to adult patterns of resting-state activity through neuronal development in the human brain is currently unknown. Therefore, we used functional MRI to map patterns of resting-state activity in infants during sleep. We found five unique resting-states networks in the infant brain that encompassed the primary visual cortex, bilateral sensorimotor areas, bilateral auditory cortex, a network including the precuneus area, lateral parietal cortex, and the cerebellum as well as an anterior network that incorporated the medial and dorsolateral prefrontal cortex. These results suggest that resting-state networks driven by spontaneous signal fluctuations are present already in the infant brain. The potential link between the emergence of behavior and patterns of resting-state activity in the infant brain is discussed.
Neuroscience
Resting-state networks in the infant brain

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Magnetic Resonance Research Center, Department of Clinical Neuroscience, Stockholm Brain Institute, Karolinska Institute, SE-171 77 Stockholm, Sweden;
Neonatal Research Unit, Astrid Lindgren Children's Hospital, Karolinska Institute, SE-171 76 Stockholm, Sweden; ¶Department of Neonatology, Erasmus MC-Sophia Children's Hospital, 3000 CB, Rotterdam, The Netherlands; and ||Department of Clinical Science, Intervention, and Technology, Karolinska Institute, S-141 57 Huddinge, Sweden
Author contributions: P.F., M.B., H.L., and U.Å. designed research; P.F., B.S., S.H., and A.N. performed research; P.F. contributed new reagents/analytic tools; P.F. analyzed data; and P.F., H.L., and U.Å. wrote the paper.
The authors declare no conflict of interest.
To whom correspondence should be addressed at: MR Research Center, N8, Department of Clinical Neuroscience, Karolinska University Hospital, SE-171 76 Stockholm, Sweden.
www.pnas.org/cgi/doi/10.1073/pnas.0704380104
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