Table 2.

Values of the three signal processing/classification parameters tested during Phase II.

Parameter	Parameter values tested
FFT Window lengtha	100, 300, 500, 700 and 900 ms
Number of preceding processed data samples (at 10 Hz) used to predict present hand state	0 (current time sample only), 2, 4, or 6
Presumed transition point between the relaxed and finger extension state (1) used for training (0) the classifier (see bottom of figure 2 showing state labels transitioning from 0 to 1 at different time points in the movement preparation epoch).	To be thorough, all transition points ranging from 1.2s before to 0.5s after movement onset were tested in 100 ms increments.

^aFFTs were still calculated every 100 ms using overlapping windows of data. Although changing window lengths altered the frequency band sizes, the frequency bands used for decoding were kept consistent with those identified in phase I by interpolating across bands as needed