Sleep spindles
Sleep Spindles
Sleep spindles (pronunciation: /sli:p 'spɪndl̩z/) are bursts of brain activity visible on an EEG that occur during stage 2 of sleep. They are called "spindles" due to their distinctive shape on the EEG that resembles a spinning wheel's spindle.
Etymology
The term "sleep spindle" originates from the spindle-like shape of the waves when observed on an EEG. The word "spindle" itself is derived from the Old English "spinnel", which refers to a spinning tool.
Description
Sleep spindles are a type of brain wave that occur in the thalamus and are characterized by their frequency, typically between 11 and 16 Hz. They are thought to play a role in inhibiting certain perceptions so that we maintain a tranquil state during sleep. Sleep spindles are also associated with the integration of new information into existing knowledge, as well as directing information to the neocortex.
Related Terms
- K-complex: A waveform that often accompanies sleep spindles during stage 2 sleep.
- Slow-wave Sleep: The deepest phase of non-REM sleep, characterized by the presence of delta waves.
- REM Sleep: A phase of sleep characterized by rapid eye movements, dreaming, and physiological activity.
- NREM Sleep: The phase of sleep that includes sleep spindles and is divided into stages 1, 2, and 3.
See Also
External links
- Medical encyclopedia article on Sleep spindles
- Wikipedia's article - Sleep spindles
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