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. 2019 May 22;36(11):1890–1907. doi: 10.1089/neu.2018.6107

FIG. 2.

FIG. 2.

Occipital intermittent rhythmic delta activity (OIRDA). Upper panel: Electroencephalogram (30-sec epoch, low-frequency filter 0.5 Hz, high-frequency filter 100 Hz) showing occipital intermittent rhythmic delta activity after lateral fluid-percussion injury Note the marked attenuation in the anterior electrodes (C3, C4) with persistent polymorphic sharp delta activity in the posterior electrodes (O1, O2) with sporadic spikes and sharp waves. The activity was not associated with any apparent behavioral manifestation (animal was lying down). Lower panel: A heat map showing 6 h of continuous sharp delta activity in the same rat. Note the intermittent increase in occipital (O1, O2) delta band, followed by periods of silence. Orange box indicates the electroencephalogram epoch shown in the upper panel. For a longer period of OIRDA, see Supplementary Video S1. Color image is available online.