Based On The Research Of Cognitive Mechanism Of Smooth Tracking Eye Movement

This research mainly focused on recognition mechanisms of smooth pursuit eyemovement, which contained two major parts. First, we investigated the tracing anddiscrimination performance of detecting stimulus in different speed conditions, exploredtheir internal relations and figured out relationships between speed variation and theattention allocation. Second, pupil change tendency were also studied in smooth pursuiteye movement, the factors that induced pupil constriction and dilation were examined.Based on the experimental results, we found that tracing performance and stimulusdiscriminating accuracy decreased when target velocity grew up, and they changeddrastically between speeds of20deg/s and25deg/s. What’s more, the research revealedthat horizontal-vertical anisotropy (HVA) also existed. When the target velocity wasless than20deg/s, HVA reached a significant level. Beside this, there was no differenceof discriminating rate between the two conditions, stimulus presented in front of thetarget and behind it. Through careful contrast of discrimination accuracy of the stimuluspresented ahead and behind the target on the conditions of eyes lagged and pulled aheadthe tracking target, we found that the allocation of attention preferred the front area ofthe target in deed, but due to the spatial allocation of attention participated in, theoverall effect was cancelled, which led to symmetrical discriminating performance intwo sides of the target. Based on results of tracing performance and discriminating rate20deg/s is a speed top-limit in smooth pursuit eye movement, and is recommended forthose who prefer to carry out experiment based smooth pursuit eye movement.According to our experiments, two obvious pupil changes caused by visual stimuliwere detected. First, subjects’ pupil constricted sharply after the pursuit target presented.Second, the pupil dilated quickly after the visual task flashed. We concluded that thepupil constriction was triggered by subjects’ pinpointing of the target, and the dilationwas caused by visual detecting task. Our results suggest that pupil variations could beused to monitor if the subjects in the experiment focus on the visual tasks or not.