Calixto Machado*
Recent research has identified an increase in EEG gamma activity following cardiac arrest. Gamma oscillations, which are high-frequency brain waves (30 Hz-90 Hz), are linked to various cognitive processes and states of consciousness. The synchronized activity of neurons in the gamma-band is believed to integrate different aspects of an object’s properties. These findings bring to mind recent studies that indicate these oscillations may also play a role in Near-Death Experiences (NDEs), particularly concerning visual hallucinations. During NDEs, individuals frequently report vivid visual experiences, such as witnessing bright lights or seeing deceased relatives. In a recent case, we monitored a patient suffering from a heart attack using Continuous Electroencephalogram (cEEG). Interestingly gamma activity was consistently observed throughout the recording even after the patient experienced Ventricular Fibrillation (VF) and Cardiac Arrest (CA). Clinical monitoring showed that ECG activity was inadequate to support proper cerebral blood flow before VF and CA. While these results are compelling, they are not yet definitive in explaining NDEs.
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