This analysis occurs through the use of bandpass filtering of the EEG recordings. The conventional bandwidth of clinical EEG focuses on the analysis of waveforms ranging from 0.5Hz to 70Hz. In addition, there are other waveforms such as infra slow oscillations (ISO) (less than 0.5Hz) and high-frequency oscillations (HFOs) (greater than 30Hz) which are outside the conventional bandwidth of clinical EEG but have recently found clinical importance with the advent of digital signal processing. The most commonly studied waveforms include delta (0.5 to 4Hz) theta (4 to 7Hz) alpha (8 to 12Hz) sigma (12 to 16Hz) and beta (13 to 30Hz). However, the most frequently used method to classify EEG waveforms is by the frequency, so much so, that EEG waves are named based on their frequency range using Greek numerals. Clinical SignificanceĮEG waveforms may be characterized based on their location, amplitude, frequency, morphology, continuity (rhythmic, intermittent or continuous), synchrony, symmetry, and reactivity. Even before one starts the analysis, you need to have information regarding several confounding variables including patient's age, state of consciousness, physical and mental activity and the presence of different biological, environmental stimuli and pharmacological agents which can affect the waveforms. It is extremely important to follow a systematic approach while interpreting the waveforms in an EEG recording. The normal EEG is extremely diverse and has a broad range of physiological variability. Analyzing and interpreting the EEG is both an art and science. Outline normal EEG waveforms, and explain the role of the interprofessional team in providing care of patients who are evaluated by EEG.ĮEG activity reflects the temporal summation of the synchronous activity of millions of cortical neurons that are spatially aligned.Explain how EEG waveforms are characterized.Discuss why a systematic approach is necessary in performing an EEG.
Explain the temporal summation of the cortical neurons in an EEG.This activity illustrates EEG normal waveforms, and explains the role of the interprofessional team in improving care of patients who are evaluated by EEG. The normal EEG is extremely diverse and has a broad range of physiological variability. EEG activity reflects the temporal summation of the synchronous activity of millions of cortical neurons that are spatially aligned.
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