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Ability to distinguish any number of fixation and pursuit events within
a single inter-saccade-period
No longer use a maximum amplitude parameter to distinguish pursuits from
fixations, but use a single velocity threshold instead. The threshold
is evaluated against a heavily low-pass filtered gaze trajectory, to
only reflect "smooth" eye movement components (and thereby suppress the
impact of measurement noise).
New parameter noise_factor that influences the adaptive saccade velocity
threshold. The saccade onset velocity threshold is the median of all
sub-threshold velocities plus noise_factor times the MAD of these
velocities. The saccade peak velocity threshold is computed in the same
fashion, but uses 2x noise_factor. The default value should work for
noisy data. Reducing this factor can boost saccade detection sensitivity
for clean data (e.g. Nyström et al., 2010 use the equivalent of a factor
of 3.0)