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211 – EEG Analysis With AcqKnowledge

The AcqKnowledge software will record EEG data, filter the data into the specific bandwidths for Alpha, Theta, Beta and Delta, and display the results on-line. Often, researchers also need to quantify the activity in each band.

This Application Note provides a useful technique for analyzing EEG signals and quantifying the activity in each band. This note will explain how to:

  1. Integrate the alpha wave EEG data to get a better view of alpha wave activity.
  2. Identify where the integrated data crosses certain threshold values.
  3. Measure the amount of time that was spent in a heightened alpha state and count the number of times that the subject entered the state.

This note describes the procedure for working off-line with a saved data file, but you can also perform these functions online (as noted at each step).

 
The examples in this note use a raw EEG signal taken from a human subject and filtered to show the Alpha wave activity.

 

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