| Summary: | 碩士 === 長庚大學 === 臨床行為科學研究所 === 92 === Eye patching is a commonly used strategy for remediating vision and visual attention deficits. This thesis was designed to investigate the behavioral and neurological effects on the performance of bilateral symmetrical attention. Eighteen right handed college male students participated this study to perform the line bisection and the computerized landmark tasks under three conditions: (1) non-patching condition; (2) right monocular patching condition; and (3) right hemi-field patching condition. Besides the behavioral data collected in both tasks, the event -related potentials (ERPs) were also investigated in the landmark task.
Findings of the line bisection performance showed a more manifest leftward error under the right hemi-field patching condition than others (F(2.30, 17.28) = 5.27, effect size eta = .64, p = .01). Nevertheless, the right monocular patching presented greater rightward error than other conditions. The results of early event-related potentials (50-90 msec post stimulus) showed the peak amplitude differences between right/left occipital regions among three patching conditions were significant (F(2.84, 21.27) = 3.42, effect size eta = .56, p = .04). Especially, the right occipital regions were activated more under the right hemi-field patching condition. Similarly, in the late phase (140-300 msec post stimulus), the right lateralized effect was also found in the parietal regions under the condition of right hemi-field patching.
As a result, the right hemi-field patching might increase the right hemisphere activation and the awarness of left visual hemispace. Whereas, the right monocular patching condition was not able to achieve this right lateralized effect, it might induce the attentional bias to right hemispace. These behavioral and electrophysiological findings will be used to substantiate the meaning of eye patching on neurobehavioral theory and visual rehabilitation.
|
|---|
