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Fig. 1 | Neuropsychiatric Electrophysiology

Fig. 1

From: The impact of Arterial Pulse Impedance Artifact (APIA) on test-retest reliability of quantitative EEG

Fig. 1

Mean power spectra as calculated from the last 150 consecutive 2s epochs (5 min) with ipsilateral reference (A1, A2) and Pz as ground electrode. A ground electrode is needed to serve as a common reference point for all voltages in the system or with respect to collect the grounding of the potentials of an EEG system. Subject: healthy male, 31 years of age; Fig. 1 shows the ipsilateral power spectra with an interval of 4 weeks (I: 01/02/08 and II: 02/03/08). Please note channels T4-A2 and F8-A2. Especially the former shows a right-hemispheric needle-like steep peak within the slow Delta-range. A similar peak but less distinct can be observed in the right temporo-frontal region over F8. Notably is the impoverished Alpha peak as an indicator of a desynchronized low voltage EEG to be observed with 7–10 % of adults with an intact brain function

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