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Aliasing in the visual EEG: a potential pitfall of video display technology
1Neurology, Emory University Clinic A, 1365 Clifton Road, NE, Atlanta, GA 30322, USA. chipstein@earthlink.net
Summary
Aliasing artifacts in computerized electroencephalographic (EEG) systems can be misinterpreted as actual brain activity. These visual artifacts on computer screens may affect patient management despite adherence to current guidelines.
Area of Science:
- Neuroscience
- Medical Imaging
- Biomedical Engineering
Background:
- Computerized clinical electroencephalographic (EEG) systems are standard for neurological assessment.
- Interpretation of EEG data is primarily conducted via video monitor displays.
- Potential artifacts introduced by digital display systems have been under-investigated.
Purpose of the Study:
- To identify and illustrate aliasing artifacts in computerized EEG.
- To assess the potential for misinterpretation of these artifacts as genuine EEG signals.
- To evaluate the clinical impact of aliasing artifacts on patient management.
Main Methods:
- Visual analysis of EEG data displayed on video monitors.
- Inclusion of photographic evidence of aliasing artifacts.
- Presentation of three clinical cases demonstrating aliasing artifacts.
Main Results:
- Aliasing artifacts are frequently observed in computerized EEG systems.
- Some aliasing artifacts can be mistaken for actual EEG activity.
- Artifacts led to misinterpretations and transient changes in patient management in demonstrated cases.
Conclusions:
- Aliasing artifacts pose a significant challenge in computerized EEG interpretation.
- Current guidelines may not fully mitigate the occurrence or misinterpretation of these artifacts.
- Awareness and vigilance are crucial for accurate EEG analysis in digital environments.