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| Title |
Electroencephalographic effects of ketamine on power, cross-frequency coupling, and connectivity in the alpha bandwidth
|
|---|---|
| Published in |
Frontiers in Systems Neuroscience, July 2014
|
| DOI | 10.3389/fnsys.2014.00114 |
| Pubmed ID | |
| Authors |
Stefanie Blain-Moraes, UnCheol Lee, SeungWoo Ku, GyuJeong Noh, George A. Mashour |
| Abstract |
Recent studies of propofol-induced unconsciousness have identified characteristic properties of electroencephalographic alpha rhythms that may be mediated by drug activity at γ-aminobutyric acid (GABA) receptors in the thalamus. However, the effect of ketamine (a primarily non-GABAergic anesthetic drug) on alpha oscillations has not been systematically evaluated. We analyzed the electroencephalogram of 28 surgical patients during consciousness and ketamine-induced unconsciousness with a focus on frontal power, frontal cross-frequency coupling, frontal-parietal functional connectivity (measured by coherence and phase lag index), and frontal-to-parietal directional connectivity (measured by directed phase lag index) in the alpha bandwidth. Unlike past studies of propofol, ketamine-induced unconsciousness was not associated with increases in the power of frontal alpha rhythms, characteristic cross-frequency coupling patterns of frontal alpha power and slow-oscillation phase, or decreases in coherence in the alpha bandwidth. Like past studies of propofol using undirected and directed phase lag index, ketamine reduced frontal-parietal (functional) and frontal-to-parietal (directional) connectivity in the alpha bandwidth. These results suggest that directional connectivity changes in the alpha bandwidth may be state-related markers of unconsciousness induced by both GABAergic and non-GABAergic anesthetics. |
X Demographics
The data shown below were collected from the profiles of 2 X users who shared this research output. Click here to find out more about how the information was compiled.
Geographical breakdown
| Country | Count | As % |
|---|---|---|
| Italy | 1 | 50% |
| Canada | 1 | 50% |
Demographic breakdown
| Type | Count | As % |
|---|---|---|
| Members of the public | 1 | 50% |
| Scientists | 1 | 50% |
Mendeley readers
The data shown below were compiled from readership statistics for 149 Mendeley readers of this research output. Click here to see the associated Mendeley record.
Geographical breakdown
| Country | Count | As % |
|---|---|---|
| Canada | 2 | 1% |
| Denmark | 1 | <1% |
| Italy | 1 | <1% |
| Brazil | 1 | <1% |
| Unknown | 144 | 97% |
Demographic breakdown
| Readers by professional status | Count | As % |
|---|---|---|
| Researcher | 31 | 21% |
| Student > Bachelor | 23 | 15% |
| Student > Ph. D. Student | 19 | 13% |
| Student > Master | 18 | 12% |
| Professor | 8 | 5% |
| Other | 26 | 17% |
| Unknown | 24 | 16% |
| Readers by discipline | Count | As % |
|---|---|---|
| Neuroscience | 34 | 23% |
| Medicine and Dentistry | 25 | 17% |
| Agricultural and Biological Sciences | 14 | 9% |
| Engineering | 13 | 9% |
| Psychology | 10 | 7% |
| Other | 21 | 14% |
| Unknown | 32 | 21% |
Attention Score in Context
This research output has an Altmetric Attention Score of 1. 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 15 April 2015.
All research outputs
#15,303,056
of 22,758,963 outputs
Outputs from Frontiers in Systems Neuroscience
#958
of 1,340 outputs
Outputs of similar age
#133,063
of 227,589 outputs
Outputs of similar age from Frontiers in Systems Neuroscience
#33
of 47 outputs
Altmetric has tracked 22,758,963 research outputs across all sources so far. This one is in the 22nd percentile – i.e., 22% of other outputs scored the same or lower than it.
So far Altmetric has tracked 1,340 research outputs from this source. They typically receive a lot more attention than average, with a mean Attention Score of 10.6. This one is in the 21st percentile – i.e., 21% of its peers scored the same or lower than it.
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 227,589 tracked outputs that were published within six weeks on either side of this one in any source. This one is in the 32nd percentile – i.e., 32% of its contemporaries scored the same or lower than it.
We're also able to compare this research output to 47 others from the same source and published within six weeks on either side of this one. This one is in the 14th percentile – i.e., 14% of its contemporaries scored the same or lower than it.