What is the most appropriate sampling rate for a HFF setting of 70 Hz according to ACNS guidelines?

In the context of high-frequency filter (HFF) settings in electroencephalography (EEG), the ACNS (American Clinical Neurophysiology Society) guidelines suggest that the sampling rate should be at least twice the highest frequency of interest included in the analysis, in accordance with the Nyquist theorem.

When the HFF is set to 70 Hz, we need to ensure that the sampling rate is sufficiently high to accurately capture the frequencies of interest, specifically those that are below the HFF setting. The minimum recommended sampling rate would be 2 times the HFF of 70 Hz, which calculates to 140 Hz. Thus, the appropriate sampling rate must be greater than this minimum threshold to account for the necessary precision in data acquisition.

The selection of 210 p/sec not only meets the minimum requirement but also provides an additional buffer that enhances the fidelity of the recorded signals, ensuring that all relevant frequencies are adequately sampled without distortion or loss of data. This makes it the correct choice for a sampling rate when dealing with an HFF of 70 Hz, aligning with best practices as specified in the ACNS guidelines.