  This work explores the utility of implicit behavioral cues, namely,
Electroencephalogram (EEG) signals and eye movements for gender recognition
(GR) and emotion recognition (ER) from psychophysical behavior. Specifically,
the examined cues are acquired via low-cost, off-the-shelf sensors. 28 users
(14 male) recognized emotions from unoccluded (no mask) and partially occluded
(eye or mouth masked) emotive faces; their EEG responses contained
gender-specific differences, while their eye movements were characteristic of
the perceived facial emotions. Experimental results reveal that (a) reliable GR
and ER is achievable with EEG and eye features, (b) differential cognitive
processing of negative emotions is observed for females and (c) eye gaze-based
gender differences manifest under partial face occlusion, as typified by the
eye and mouth mask conditions.
