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Breakdown of Cortical Effective Connectivity During Sleep.
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- Author(s): Massimini, Marcello; Ferrarelli, Fabio; Huber, Reto; Esser, Steve K.; Singh, Harpreet; Tononi, Giulio
- Source:
Science. 9/30/2005, Vol. 309 Issue 5744, p2228-2232. 5p. 3 Color Photographs, 1 Graph. - Source:
- Additional Information
- Subject Terms:
- Abstract: When we fall asleep, consciousness fades yet the brain remains active. Why is this so? To investigate whether changes in cortical information transmission play a role, we used transcranial magnetic stimulation together with highdensity electroencephalography and asked how the activation of one cortical area (the premotor area) is transmitted to the rest of the brain. During quiet wakefulness, an initial response (~15 milliseconds) at the stimulation site was followed by a sequence of waves that moved to connected cortical areas several centimeters away. During non-rapid eye movement sleep, the initial response was stronger but was rapidly extinguished and did not propagate beyond the stimulation site. Thus, the fading of consciousness during certain stages of sleep may be related to a breakdown in cortical effective connectivity. [ABSTRACT FROM AUTHOR]
- Abstract: Copyright of Science is the property of American Association for the Advancement of Science and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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