They are associated with higher cognitive processes like attention, working memory and feature binding, and are also found to be abnormal in mental health conditions like schizophrenia, autism and Alzheimer’s Disease (AD). Gamma rhythms are narrow-band oscillations in the 30-70 Hz range of the brain’s electrical activity. These results suggest that low-cost amplifiers can potentially be used in stimulus induced gamma response detection, making its research, and application in medicine more accessible. OpenBCI recordings showed gamma response in almost all the subjects who showed a gamma response in Brain Products recordings, and the spectral and temporal profiles of these responses in alpha (8–13 Hz) and gamma bands were highly correlated between OpenBCI and Brain Products recordings.

We recorded EEG signals using a low-cost, open-source amplifier (OpenBCI) and a traditional, research-grade amplifier (Brain Products GmbH) in male ( N = 6) and female ( N = 5) subjects (22–29 years) while they viewed full-screen static gratings that are known to induce gamma oscillations. While low-cost EEG amplifiers have become popular in Brain Computer Interface applications that mainly rely on low-frequency oscillations (< 30 Hz) or steady-state-visually-evoked-potentials, whether they can also be used to measure stimulus-induced gamma oscillations is unknown. Previous studies that recorded stimulus-induced gamma oscillations used expensive research-grade EEG amplifiers to address this issue. However, since the absolute power in EEG decreases rapidly with increasing frequency following a “1 /f” power law, and the gamma band includes line noise frequency, these oscillations are highly susceptible to instrument noise. This suggests that gamma oscillations could be valuable both as a research tool and an inexpensive, non-invasive biomarker for disease evaluation. Stimulus-induced narrow-band gamma oscillations (30–70 Hz) in human electro - encephalograph (EEG) have been linked to attentional and memory mechanisms and are abnormal in mental health conditions such as autism, schizophrenia and Alzheimer’s Disease.

Ark side server gamma control