Purchase this article with an account.
Kwang M. Cham, Andrew J. Anderson, Larry A. Abel; Task-Induced Stress and Motivation Decrease Foveation-Period Durations in Infantile Nystagmus Syndrome. Invest. Ophthalmol. Vis. Sci. 2008;49(7):2977-2984. doi: 10.1167/iovs.07-1626.
Download citation file:
© 2016 Association for Research in Vision and Ophthalmology.
purpose. To investigate the effect of visual demand, task-related physiological stress, and motivation on the nystagmus waveform of 19 subjects with infantile nystagmus syndrome (INS).
methods. Subjects viewed a Landolt C of varying orientation and size, and indicated its orientation via arrow keys on a keyboard. Mental arithmetic was performed in conjunction with the visual task. Subjects then underwent a reward-penalty paradigm. Eye movements and heart rates were recorded during all experiments.
results. Task-related physiological stress and motivation were reflected in an increase in heart rate and led to an increase in the amplitude, frequency, and intensity of the nystagmus waveform and a decrease in foveation-period durations. Changes in heart rate did not correlate with changes in waveform parameters for all experiments.
conclusions. The results show, for the first time, the negative impact of task-induced stress and/or motivation on the characteristics of INS. This finding has important implications for individuals with INS, because stress may arise in everyday situations, such as driving or when undertaking an examination.
This PDF is available to Subscribers Only