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Stroboscopic artifact in digital video-EEG.

Combined digital video-EEG (DV-EEG) systems eliminate many familiar technical artifacts of older analog recorders; however, new and unanticipated technical issues are becoming evident. In this report, a case is described that identifies one of these technical limitations that could represent a pitfa...

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Published in:Journal of Clinical Neurophysiology Vol. 21; no. 2; pp. 96 - 99
Main Authors: Quigg, Mark, Taft, William
Format: case study research Journal Article
Published: Lippincott Williams & Wilkins Mar2004
Online Access:View this record in EBSCOhost
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      dt: Mar2004
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      pub: Lippincott Williams & Wilkins
      place: Baltimore, Maryland
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        atl: Stroboscopic artifact in digital video-EEG.
      aug:
        au:
          Quigg, Mark
          Taft, William
        affil: Department of Neurology and the FE Dreifuss Comprehensive Epilepsy Program, University of Virginia, Charlottesville, Virginia 22908, USA
      sug:
        subj:
          Electroencephalography Equipment and Supplies
          Seizures Diagnosis
          Equipment Failure
          Physical Stimulation Methods
          User-Computer Interface
          Diagnostic Errors Prevention and Control
          Artifacts
          Adolescence
          Sample Size
          Human
          Signal Processing, Computer Assisted
          Electroencephalography Methods
          Male
          Computers and Computerization
          Computer Terminals
          Validation Studies
          Comparative Studies
          Evaluation Research
          Multicenter Studies
          Adolescent: 13-18 years
          Male
      ab: Combined digital video-EEG (DV-EEG) systems eliminate many familiar technical artifacts of older analog recorders; however, new and unanticipated technical issues are becoming evident. In this report, a case is described that identifies one of these technical limitations that could represent a pitfall to accurate data interpretation. An EEG was recorded on an 18-year-old man with history of photically sensitive generalized tonic-clonic seizures, revealing photoparoxysmal responses that appeared to outlast photic stimulation. However, in an attempted video-EEG correlation, the digital video recording showed variable appearance or absence of photic bursts that did not correlate with EEG photic tick marks, initially suggesting desynchronization between video and EEG signals. However, the absence of flashes seen on the video record resulted from stroboscopic artifact caused by mismatch between strobe frequency, video sampling rate, and video display characteristics. Stroboscopic aliasing is a DV-EEG specific artifact that can complicate accurate interpretation of photoparoxysmal responses.
      pubtype: Academic Journal
      doctype:
        case study
        research
        Journal Article
      ougenre: Article
    language: English
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