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(of an electroencephalogram), the replacement of time-ordered, synchronous high-amplitude (30-100 microvolts [μv ]) and slow (α and θ-activity) oscillations of biopotentials by less regular, low-amplitude (5-25 μV) and faster (β-activity) oscillations. The desynchronization of biopotentials in the cerebral cortex usually occurs in response to various stimuli (see Figure 1) but may be caused, for example, by some pharmaceuticals. Desynchronization is one version of the “activation reaction,” or the “waking reaction,” in which the leading role is played by influences exerted on the cortex of the formatio reticularis. Desynchronization also sets in during particular stages of sleep (the fast phase of sleep, or “fast” sleep). Desynchronization is a manifestation of the orientation reflex.

Figure 1. Human electroencephalogram. At rest a regular α-rhythm with a frequency of 10 periods per second is recorded on pickups from various regions of the brain (at left). In response to a light stimulus (the dark band at bottom) the α-rhythm is replaced by low-amplitude β-activity. Scale: 50 μV along the vertical, 1 sec along the horizontal.

Persistent desynchronization (a so-called flat electroencephalogram) is one indication of disruption of the activity of the central nervous system.


References in periodicals archive ?
Memory may emerge when rhinal and hippocampal neurons synchronously oscillate and then desynchronize.
The brain must be able to first synchronize, and then later desynchronize, different areas in order to react, regulate mood, learn and solve problems," he suggested.
Following stimulation, the neurons desynchronize, similar to the firing pattern that you would see when a healthy mouse is continuously moving," Petersson added.
The visual cortex corresponding to the right visual field provides only distracting information; as a result, the frontal cortex desynchronizes with these neurons to reduce susceptibility to distraction.
When Jonas draws and redraws as performance, whether broad circles or conical shapes, faces or dogs or astronomical bodies, she cuts through our assumptions about the image--its transmission and comprehensibility in the present tense--just as surely as when she desynchronizes recorded image and sound.
EEG in healthy people during memory process has changes in theta and alpha activity; theta synchronizes with an increased in task demands (theta power increases), whereas alpha desynchronizes (alpha power decreases) (28,29).
In [7], V-DESYNC desynchronizes vehicles to broadcast beacons at different times based on timing information.
29 ( ANI ): A brain chemical, called VIP, which desynchronizes the cells in the biological clock helps the clock adjust more quickly to abrupt shifts in daily light/dark schedules such as those that plague modern life, according to a research.
The current system disperses parts of execution and preparation throughout the organization and desynchronizes the efforts.