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Frequencies contributing to functional connectivity in the cerebral cortex in "resting-state" data.

Overview of attention for article published in American Journal of Neuroradiology, August 2001
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Title
Frequencies contributing to functional connectivity in the cerebral cortex in "resting-state" data.
Published in
American Journal of Neuroradiology, August 2001
Pubmed ID
Authors

D Cordes, V M Haughton, K Arfanakis, J D Carew, P A Turski, C H Moritz, M A Quigley, M E Meyerand

Abstract

In subjects performing no specific cognitive task ("resting state"), time courses of voxels within functionally connected regions of the brain have high cross-correlation coefficients ("functional connectivity"). The purpose of this study was to measure the contributions of low frequencies and physiological noise to cross-correlation maps. In four healthy volunteers, task-activation functional MR imaging and resting-state data were acquired. We obtained four contiguous slice locations in the "resting state" with a high sampling rate. Regions of interest consisting of four contiguous voxels were selected. The correlation coefficient for the averaged time course and every other voxel in the four slices was calculated and separated into its component frequency contributions. We calculated the relative amounts of the spectrum that were in the low-frequency (0 to 0.1 Hz), the respiratory-frequency (0.1 to 0.5 Hz), and cardiac-frequency range (0.6 to 1.2 Hz). For each volunteer, resting-state maps that resembled task-activation maps were obtained. For the auditory and visual cortices, the correlation coefficient depended almost exclusively on low frequencies (<0.1 Hz). For all cortical regions studied, low-frequency fluctuations contributed more than 90% of the correlation coefficient. Physiological (respiratory and cardiac) noise sources contributed less than 10% to any functional connectivity MR imaging map. In blood vessels and cerebrospinal fluid, physiological noise contributed more to the correlation coefficient. Functional connectivity in the auditory, visual, and sensorimotor cortices is characterized predominantly by frequencies slower than those in the cardiac and respiratory cycles. In functionally connected regions, these low frequencies are characterized by a high degree of temporal coherence.

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Mendeley readers

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Geographical breakdown

Country Count As %
United States 24 3%
United Kingdom 11 1%
Germany 6 <1%
Netherlands 4 <1%
Brazil 3 <1%
France 2 <1%
Italy 2 <1%
Japan 2 <1%
Ireland 2 <1%
Other 10 1%
Unknown 743 92%

Demographic breakdown

Readers by professional status Count As %
Student > Ph. D. Student 196 24%
Researcher 174 22%
Student > Master 114 14%
Professor > Associate Professor 60 7%
Student > Doctoral Student 40 5%
Other 116 14%
Unknown 109 13%
Readers by discipline Count As %
Neuroscience 137 17%
Psychology 129 16%
Agricultural and Biological Sciences 107 13%
Medicine and Dentistry 104 13%
Engineering 71 9%
Other 102 13%
Unknown 159 20%
Attention Score in Context

Attention Score in Context

This research output has an Altmetric Attention Score of 4. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 03 August 2022.
All research outputs
#6,491,162
of 23,016,919 outputs
Outputs from American Journal of Neuroradiology
#1,715
of 4,909 outputs
Outputs of similar age
#11,535
of 38,534 outputs
Outputs of similar age from American Journal of Neuroradiology
#3
of 4 outputs
Altmetric has tracked 23,016,919 research outputs across all sources so far. This one has received more attention than most of these and is in the 70th percentile.
So far Altmetric has tracked 4,909 research outputs from this source. They typically receive a little more attention than average, with a mean Attention Score of 6.2. This one has gotten more attention than average, scoring higher than 63% of its peers.
Older research outputs will score higher simply because they've had more time to accumulate mentions. To account for age we can compare this Altmetric Attention Score to the 38,534 tracked outputs that were published within six weeks on either side of this one in any source. This one has gotten more attention than average, scoring higher than 68% of its contemporaries.
We're also able to compare this research output to 4 others from the same source and published within six weeks on either side of this one.