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Summary: &p.1:Abstract We measured the gain and phase of vertical
vergence in response to disjunctive vertical oscillations
of dichoptic textured displays. The texture elements were
m-scaled to equate visibility over the area of the display
and were aperiodic and varied in shape so as to avoid
spurious binocular matches. The display subtended 65°
and oscillated through peak-to-peak amplitudes from
18 arc min to 4° at frequencies from 0.05 to 2 Hz larg-
er ranges than used in previous investigations. The gain
of vergence was near 1 when the stimulus oscillated at
18 arc min at a frequency of 0.1 Hz or less. As the am-
plitude of stimulus oscillation increased from 18 arc min
to 4°, vergence gain decreased at all frequencies, which
is evidence of a nonlinearity. Gain declined with increas-
ing stimulus frequency but was still about 0.5 at 2 Hz for
an amplitude of 18 arc min. Phase lag increased from
less than 10° at a stimulus frequency of 0.05 Hz to be-
tween 100° and 145° at 2 Hz. Overall, the dynamics of
vertical vergence resemble the dynamics of horizontal
vergence and cyclovergence.
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