The time difference between the negative and positive
peaks ofthe preprocessed EGG complex determines the
eyeblink duration. This is in general agreement with the
commonly used half-amplitude definition with respect to
the original EOG complex. Figure 2 is used to illustrate
this correspondence: The half-amplitude point (as marked
by a triangle) in the original EOG is the midpoint of the
negative slope. When the EGG signal is differentiated,
this negative slope is represented by the trough in w[k]
(Figure 2c), and the bottom of the trough is approximately
the midpoint ofthis slope, as indicated by the triangles.
Similarly, the correspondence between the midpoint
of the positive slope in the original EOG x[k] and the positive peak of the preprocessed EOG w[k] can be
established