Intermediate
Signal-to-noise ratio (SNR)
Also known as: SNR, Noise
How strong the useful brain signal is compared with unwanted noise. Higher SNR means more reliable decoding.
Distance, the skull, poor electrode contact, muscle activity and electrical interference all lower SNR. Much of BCI engineering is about raising it, through better sensors or placement, or through smart filtering and averaging.
Last updated Sep 30, 2026. Educational content, not medical advice.