EEG signal processing
I'll assume that you want to do online monitoring.

You can always store the coming data from the GUI in a vector in MATLABA.
Then you can run simple code to plot them.

This also depends on the type of measurements you have. If the set is capable on detecting power ranges as well you should have the following readings:

High Alpha, Low Alpha, High Beta, Low Beta, High Gamma, Low Gamma, Delta, Theta, Attention, and Meditation.