Pupil Diameter Frequency Response within Experimental Epochs for All Participants.

<p>The figure illustrates the average frequency domain response of pupil diameter within all trials for both experimental conditions for all participants. The red color denotes the left hand motor imagery class and the blue line the no task condition. Pupillary oscillations in the frequency band between 0 and 0.3Hz seem larger in the left motor imagery trials during the motor imagery condition in most but not all participants.