Information Technology Reference
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Figure 4: Residual (first row), and re-estimated flow (second row) for the
sequences depicted in Figure 2.
As regards the eye, the visual features involved in recognizing the
cognitive status are gaze direction, dilation of the pupil and eyelid closure.
Figure 5 shows the measures for these parameters.
Dilation of the pupil indicates that cognitive activity is intensifying or it is
arising suddenly, while a fixed gaze can be a sign of a very strong mental
activity due to data elaboration. Other features are the position of eyelids with
respect to iris, the eyebrows' shape (plain, raised or frowned) and the presence
of wrinkles at the eye corners, between the eyebrows or beneath lower eyelids.
Figure 5: Eye parameters [10].
