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&p.1:Abstract We measured the gain and phase of vertical vergence in response to disjunctive vertical oscillations
 

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.

  

Source: Allison, Robert - Department of Computer Science, York University (Toronto)

 

Collections: Computer Technologies and Information Sciences; Biology and Medicine