Examlex
The normal random variable's density function is perfectly symmetric about a peaked central value and, thus bell shaped; and characterized by tails extending indefinitely in both directions from the centre, approaching (but never touching) the horizontal axis. All of this implies a positive probability for finding values of the random variable anywhere between minus infinity and plus infinity.
Slow Wave Sleep
A phase of sleep characterized by low frequency, high amplitude brain waves, indicative of deep, restorative sleep.
Sleep Spindles
Brief bursts of brain activity, characterized by rapid rhythms, that occur during stage 2 of non-REM sleep and are associated with learning and memory consolidation.
EEG
Electroencephalogram, a test that measures the electrical activity of the brain and is used in the diagnosis and treatment of neurological conditions.
Alpha Waves
Brain waves that indicate a state of relaxation or light sleep.
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