How much voltage would be recorded if 25uV beta activity is recorded using a LFF of 1Hz?

When considering the relationship between the low-frequency filter (LFF) setting and the recorded voltage, it’s important to note that the LFF primarily impacts the way lower frequency signals are recorded, essentially allowing for the attenuation of these frequencies. In this specific question, a beta activity of 25µV is recorded. Since beta activity typically occurs within the frequency range of 13-30 Hz and is not influenced significantly by a low-frequency filter set at 1 Hz, the recorded voltage remains unchanged.

Thus, 25µV remains as the output because the LFF does not affect signals above its cutoff frequency; it primarily attenuates lower frequency signals. Consequently, the understanding of filtering in EEG and its effects on recorded voltages leads directly to recognizing that the original voltage value of 25µV is accurately represented in the recording.