EEG
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| show | The term previously used to describe periodic lateralized epileptiform discharges also known as PLEDs. (Chatrian 1961)
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| PLEDs | show 🗑
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| show | Periodically recurring focal discharges. (Hughes and Schlagenhauff 1965)
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| Cerebral Bigeminy | show 🗑
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| show | Pseudoperiodic lateralized paroxysmal discharges. PLEDs in which the repetition rate is not precisely regular.
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| show | Bilateral PLEDs that occur independently between cerebral hemispheres.
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| PSPA | show 🗑
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| show | Persistent PLEDs over long periods of time.
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| show | Periodic epileptiform discharges arising from the centro-parietal midline sagittal region.
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| show | Periodic lateralized epileptiform discharges followed by after-discharges occurring in clusters.
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| PLEDs Plus | show 🗑
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| PLEDs Proper | show 🗑
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| show | PLEDs that occur sequentially between consecutive seizures.
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| Tri-Focal PLEDs | show 🗑
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| show | Tri-focal independent periodic lateralized epileptiform discharges occurring in three different areas.
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| show | Periodic discharges arising from ipsilateral independent foci.
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| show | PLEDs that occur in at least three independent site and involve both hemispheres,
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| show | The process of amplification, recording, and analysis of the electrical potentials of the brain,
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| show | The result of electrical activity directly from the surface of the cerebral cortex either during surgery or post surgery using implanted electrodes.
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| Lead | show 🗑
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| show | The instrument used to amplify and record the electrical potentials of the brain.
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| show | The EEG recording itself.
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| ND (Neurodiagnostics) | show 🗑
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| Sagittal | show 🗑
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| show | One set of 2 electrodes, placed into Grid 1 and Grid 2 of one channel of the electroencephalograph.
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| Horizontal Dipole | show 🗑
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| show | Refers to the montage which consists of chains of electrodes going from anterior to posterior, left over right, in temporal chains and parasagittal chains across the head.
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| show | An organized combination of electrode derivations recording at the same time on the electroencephalograph.
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| show | Having two equal and opposite magnetized or electrically charged poles that are separated by a short distance.
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| show | Refers to a montage that is referential.
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| Vertex | show 🗑
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| Dura Mater | show 🗑
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| Arachnoid Mater | show 🗑
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| show | The innermost layer of the meninges.
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| show | In EEG, it is a montage that goes crosswise across the head from left to right.
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| show | Used to describe paroxysmal patterns such as epileptiform patterns and seizure patterns.
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| show | The three membranes enveloping the brain and spinal cord. The three layers are called Dura, Arachnoid, and Pia.
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| show | In EEG, the 2 planes running front to back on either side of the midline.
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| show | In EEG, one line of activity derived from 2 electrodes input into a differential amplifier.
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| Gyrus | show 🗑
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| show | Plural of gyrus.
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| Cortex | show 🗑
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| Central Sulcus aka Rolandic Fissure | show 🗑
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| show | Term indicating a location not on the head.
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| show | Inflammation of the meninges.
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| Sulcus | show 🗑
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| show | Plural of sulcus, as in the "sulci of the brain."
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| Homunculus | show 🗑
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| show | Toward the midline of the body.
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| Lateral | show 🗑
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| show | Toward a reference point (extremity).
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| show | Away from a reference point (extremity).
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| Inferior | show 🗑
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| show | Upper or above.
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| Cephalad or Cranial | show 🗑
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| show | Tail, tail end.
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| show | Toward the front.
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| show | Toward the back.
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| Dorsal | show 🗑
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| show | Anterior.
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| show | An area of skin that is mainly supplied by a single spinal nerve.
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| Hertz | show 🗑
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| show | The frequency band in EEG containing faster frequencies above 30 Hz.
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| show | The frequency band in EEG containing faster frequencies 13 Hz to 30 Hz.
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| show | The frequency band in EEG containing frequencies from 8-13 Hz.
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| show | The frequency band in EEG containing frequencies from 4 Hz to less than 8 Hz.
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| Delta | show 🗑
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| Cycles per Second | show 🗑
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| Cycles | show 🗑
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| Dipole | show 🗑
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| Frequency | show 🗑
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| Monopolar | show 🗑
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| Bilateral | show 🗑
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| Lateralized | show 🗑
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| Horizontal Dipole | show 🗑
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| show | Having two poles. Refers to montages that are "scalp to scalp".
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| Background Activity | show 🗑
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| show | The frequency of activity the occupies the greater part of the recording.
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| Diffuse | show 🗑
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| show | Uncommon unilateral failure of the alpha to attenuate with eye opening. It may occur in lesions of the temporal or parietal lobes.
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| Unilateral | show 🗑
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| show | Frequency that is below the fundamental frequency, a frequency that divides evenly into the fundamental frequency.
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| show | A wave or frequency that is an integral multiple of a given fundamental frequency. Seen in photic driving responses and sometimes in electrical noise.
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| show | A transient increase in alpha frequency immediately following eye closure.
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| show | Technically means generating electrical power by converting light energy. In EEG it refers to an artifact caused by the photic stimulator in the frontal leads. The artifact is eliminated by covering the electrode with something to shield the light.
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| show | Refers to the distribution of a pattern or waveform over the surface of the brain.
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| Focal | show 🗑
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| Ipsilateral | show 🗑
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| Contralateral | show 🗑
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| show | Occurring simultaneously throughout the recording electrodes. A discharge can be primarily generalized or secondarily generalized.
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| show | Having two or more spatially separated sites of origin.
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| show | Situated in or arising from the temporal lobe.
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| show | Situated in or arising from the area of the brain around the central sulcus.
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| show | Situated in or arising from the front.
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| show | Posterior portion of the brain just above the cerebellum responsible for the processing of vision.
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| Parietal | show 🗑
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| show | A limited region of the scalp, cerebral cortex or depth electrode recording side displaying a given EEG activity, either normal or abnormal.
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| show | Propagation of EEG waves from one region of the brain to another.
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| show | Areas sharing common function. The same area on the opposite side or the same area having the same relative position in another organism.
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| show | The exact location of the brain from which an underling epileptiform discharge originates.
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| Asymmetry or Asymmetrical | show 🗑
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| Symmetry or Symmetrical | show 🗑
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| show | Multiple frequencies together creating complex waveforms.
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| Monomorphic | show 🗑
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| Morphology | show 🗑
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| Biphasic | show 🗑
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| show | A transient, usually negative in polarity but can be positive, with a duration of greater than 70 msec but less than 200 msec. Voltage is variable but usually is high. Morphology is sharply pointed.
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| show | A transient with a duration of less than 70 msec but more than 20 msec and commonly (though not exclusively) negative in polarity.
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| show | Having a curved shape as in an "S" or since wave.
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| show | Waveforms often associated with epilepsy such as spikes, sharp waves, or spike and slow wave.
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| Triphasic | show 🗑
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| Electrodecremental | show 🗑
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| show | The degree to which EEG rhythms conform to a certain ideal characteristic common to subjects in the same age group.
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| show | A waveform made up of more than one frequency and morphology.
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| show | The attenuation of activity that should be there or is present on the opposite side such as in the suppression of alpha or sleep activity.
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| Artifact | show 🗑
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Created by:
akesselman
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