delta activity

delta activity
see under rhythm.

Medical dictionary. 2011.

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  • Intermittent rhythmic delta activity — (IRDA) is a type of brain wave abnormality found in electroencephalograms (EEG). It is found in the frontal (FIRDA) or occipital (OIRDA) areas of the brain and can be caused by a number of different reasons, some benign, unknown reasons, but also …   Wikipedia

  • intermittent rhythmic delta activity — slow, paroxysmal, relatively constant delta activity seen on the electroencephalogram, associated frequently with metabolic disorders or diffuse encephalopathies and sometimes with subfrontal, deep midline, or posterior fossa lesions; it may be… …   Medical dictionary

  • polymorphic delta activity — continuous irregular slow activity that is variable in duration and amplitude and may change little with sleep or other physiological alterations; it may be related to deafferentation of an area of the cortex, to metabolic factors, or to the… …   Medical dictionary

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  • delta rhythm — rhythm on the electroencephalogram consisting of delta waves. Called also delta activity …   Medical dictionary

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