Blueribbon,
I do not have the Neurosky VIs, so it is difficult to tell much about your program.
It appears that you are obtaining one scalar value on each iteration of the loop. To find a peak you need a collection of many points. You can either accumulate the data into an array via a shift register and Replace Array Subset (Initialize the array first, outside the loop) or read it from the chart history. Then you can use the Peak Detector from the Signal Processing >> Signal Operations palette or even Array Max & Min from the Array palette if the data is not noisy.
Lynn
