NI - EEG AND ECG

 ECG & EEG Waveform LabVIEW Simulators

The electrocardiogram (ECG) is a technique of recording bioelectric currents generated by the heart. Clinicians can evaluate the conditions of a patient's heart from the ECG and perform further diagnosis. ECG records are obtained by sampling the bioelectric currents sensed by several electrodes, known as leads.

http://zone.ni.com/devzone/cda/epd/p/id/6189

Electroencephalography (EEG) is the recording of electrical activity along the scalp produced by the firing of neurons within the brain.  In clinical contexts, EEG refers to the recording of the brain's spontaneous electrical activity over a short period of time, usually 20-40 minutes, as recorded from multiple electrodes placed on the scalp. 

http://zone.ni.com/devzone/cda/epd/p/id/6190

Using FFT for EEg signal monitoring-- Case study

Spectral monitoring of EEG signals is pretty straightforward.  Normally, the time domain signal is broken into short epochs of a few seconds and an FFT is performed on that data array.  The data from the FFT is binned into frequency ranges according to standard EEG definitions:  Delta, (0-4Hz), Theta (4-8Hz), alpha (8-12Hz) , etc. The Peak power value in that frequency range and/or the cumulative power (total power in that bin) is reported.  Then the next segment of EEG data is processed and this continues either in real-time or on a prerecorded file of EG.  This process is duplicated for each channel of data corresponding to different locations on the brain.

I need to get a ratio of the power levels of two bands, 0-5 Hz and 20-40Hz, of a single channel EEG. How do bin the output of FFT? Am I using the correct Vi for this (FFT Spectrum (Mag-Phase) VI )? The Spectal Measurements Express VI look like it might be able to do this too but I cannot figure how to bin the ranges. Can I get the area under the plot some how?

We are are using a NI PCI-6221 with a NI BNC2090A box and of course the proper saftey precautions for the subjects.

http://forums.ni.com/t5/Life-Science/Using-FFT-for-EEg-signal-monitoring/m-p/944659?requireLogin=False