Alpha waves are electromagnetic oscillations in the
frequency arising from synchronous and coherent (in
phase / constructive) electrical activity of large groups of neurons in
the human brain.
Electroencephalography is the neurophysiologic measurement of the
electrical activity of the brain by recording from electrodes placed on
the scalp or, in special cases, on the cortex.
Functional neuroimaging is the use of neuroimaging technology to measure
an aspect of brain function, often with a view to understanding the
relationship between activity in certain brain areas and specific mental
Rapid eye movement (REM) is the stage of sleep characterized by rapid saccadic movements of the eyes.
A mirror neuron is a neuron which fires both when an animal performs
an action and when the animal observes the same action performed by
another (especially conspecific) animal.
Sensory neurons are nerve cells within the nervous system responsible
for converting external stimuli from the organism's environment into
internal electrical impulses.
Phantom limb is a phantom sensation in amputated or missing limbs. A
phantom sensation is a feeling that a missing limb is still attached to
In vertebrates, motor neurons (also called motoneurons) are efferent
neurons that originate in the spinal cord and synapse with muscle fibers
to facilitate muscle contraction and with muscle spindles to modify proprioceptive sensitivity.
Narcolepsy is a neurological condition most characterized by Excessive
Daytime Sleepiness (EDS), episodes of sleep and disorder of REM or rapid
eye movement sleep.
The auditory system is the sensory system for the sense of hearing.
The sound waves enter the ear canal, a simple tube (but one which
amplifies sounds that are between 3 and 12 kHz).
Seizures are temporary abnormal electro-physiologic phenomena of the
brain, resulting in abnormal synchronization of electrical neuronal
Editor's Note: This article is not intended to provide medical advice, diagnosis or treatment.