What is EEG sampling frequency

Hi,

I came across a sentecnce in a pdf file-

EEG_Sampling Rate = 128

Is this the sampling frequency? If not, what is the difference between them and how do I calculate the sampling frequency?

[Star Strider]

‘Is this the sampling frequency?’

There is no way to determine that from the information provided.

It depends on what the authors are sampling, since they could be sampling frames of the EEG and breaking the record up into vectors of 128 samples, or something else. The usual EEG sampling frequency is 1 kHz. A sampling frequency of 128 Hz would give a Nyquist frequency of 64 Hz, adequate for the low frequency EEG frequencies (usually all below 20 Hz), but would not allow for sophisticated filtering and other processing.

‘If not, what is the difference between them and how do I calculate the sampling frequency?’

There is no way to determine that. You would have to examine the Materials and Methods section, and perhaps the references if they used a method in another paper, or specific software.

[Walter Roberson]

I do see 128 Hz listed as the sampling rate in several EEG papers, especially for the Emotive headset.