Svede A, Nikitina O, 2006, "Can dynamic actions of vergence be predicted from static fixation disparity?" Perception 35 ECVP Abstract Supplement
Can dynamic actions of vergence be predicted from static fixation disparity?
A Svede, O Nikitina
We analysed static and dynamic processes of vergence and their relationship, in order to discover whether fixation disparity can be used as indicator of asymmetry in the disparity-sensitive vergence mechanism. We looked for a correlation between static fixation disparity measurements and dynamic vergence movements in response to crossed or uncrossed disparity. The equipment used was the Eye-test-PC-system (Institut für Arbeitsphysiologie, Dortmund, Germany) which allows measurement of subjective dynamic changes of vergence at different times after presentation. We observed various responses to crossed and uncrossed disparity: subjects with quite good convergence and divergence responses; those with only convergence and no divergence responses; and those with only divergence and no convergence responses. We also had a subject with weak or even no convergence and divergence responses. These responses could be strong or weak. Subjects with good convergence and divergence can reach the appropriate degree of convergence almost within 1000 ms, exhibiting a latent period, and then a fast and a slow phase of vergence. Other subjects had a quite short fast phase of vergence, but a long slow phase, reaching only ø13 of the required vergence after 1000 ms. There seems to be no strong correlation between vergence response and fixation disparity.
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