<p><b>Action Potentials:</b> The exchange of potassium (K+), Chloride (Cl-), Calcium (Ca2+) and Sodium (Na+) along the dendrite of a neuron, which produces a small battery that maintains a voltage of -60 millivolts.</p><p><b>Amplitude:</b> The height of the brainwave, measured in microvolts squared.</p><p><b>Asymmetry:</b> The absence or violation of balance between two hemispheres or quadrants.</p><p><b>Connectome:</b> The complete description of the structural connectivity (the physical wiring) of an organism’s nervous system.</p><p><b>Coherence:</b> The stability of phase relationship between any two areas of the brain. Two areas are said to be coherent if they have constant respective relative phase. Coherence in excess is hypercoherence; coherence in deficiency is hypocoherence.&nbsp;</p><p><span style="font-size: 1rem;"><b>Frequency:</b> Cycles per second. The standard unit of frequency is “Hertz,” which is abbreviated as Hz. 4 Hz is equal to four cycles per second.&nbsp;&nbsp;</span><br></p><p><b>Frequency Band:</b> A range of wave frequencies, typically grouped as follows: delta (0-4 Hz), theta (4-8 Hz), alpha (8-12 Hz), low beta (12-15 Hz), mid beta (15-25Hz), high beta (25-40Hz), gamma (40+ Hz).</p><p><b>Lateralized:</b> Occurring only over one hemisphere</p><p><b>Bilateral:</b> Occurring on both sides of the EEG; occurring over both hemispheres</p><p><b>Diffuse:</b> Widespread, occurring over a large area of one or both hemispheres</p><p><b>Dominant Frequency (Aka Background Rhythm): </b>The frequency of EEG activity that occupies the greater part of the recording</p><p><b>Focal:</b> In a clearly delineated area of the brain as in a focal temporal spike or focal slowing</p><p><b>Harmonic:</b> A wave or frequency that is an integral multiple of a given frequency.</p><p><b>Homologous:</b> Two areas at the same region of the brain, mirrored, sharing common function (i.e. C# is the homologue to C4)&nbsp;</p><p><b>Multifocal:</b> Having several independent foci as in multifocal paroxysmal spike discharges</p><p><b>Sub-harmonic:</b> A frequency that is below the fundamental frequency, which divides evenly into the fundamental frequency.</p><p><b>Synchrony:</b> A balance that occurs if waves of similar frequency occur simultaneously in different areas of the head. Waves that occur in different channels</p><p>&nbsp;without a constant time relationship to each other are called asynchronous.</p><p style="text-align: center;"><img src="@@PLUGINFILE@@/gamma-beta-alpha-theta.png" alt="Gamma" width="621" height="412" class="img-responsive atto_image_button_middle"><br></p>