Fig. 5

Overview of SNRD values for the studied artifact conditions. The SNRD values are expressed as a color-code for the clinical frequency bands, delta (0.5–4 Hz), theta (4–8 Hz), alpha (8–12 Hz), beta (12–32 Hz) and gamma (32–100 Hz). In addition, the SNRD is given in numbers for the frequency band from 32 to 48 Hz. For the relaxed condition, the SNR is given instead of the SNRD value. Negative SNRD values were set to 0 dB