Fischer B, Hartnegg K
Brain Research Group, University of Freiburg, Freiburg, Germany.
Strabismus. 2000 Jun;8(2):119-22.
The neurobiological basis of saccade control has at least three components: fixation, reflexes, voluntary control. It was found in earlier studies that the voluntary component of saccade is specifically impaired in dyslexics as compared with controls of the same age. In this study, we searched for evidence of fixation instability by analyzing the eye movements of 99 control subjects and 262 dyslexics (age 7-17 years) performing an overlap prosaccade and a gap antisaccade task. The percentage of intrusive saccades was counted for each subject during a period of the trial where stationary fixation was required. Both groups showed improvements of fixation stability with age, but the dyslexic group exhibited developmental deficits. It is discussed whether these deficits could be interpreted as consequences of deficits in the magnocellular pathway.
注视、反射、自主控制。早期研究发现，与同龄对照组相比，阅读障碍者的扫视自主控制成分受到了特异性损害。在本研究中，我们通过分析99名对照受试者和262名阅读障碍者（年龄7 - 17岁）在执行重叠前扫视和间隙反扫视任务时的眼动，来寻找注视不稳定的证据。在试验中需要固定注视的时间段内，计算每个受试者的侵入性扫视百分比。两组受试者的注视稳定性均随年龄增长而改善，但阅读障碍组表现出发育缺陷。文中讨论了这些缺陷是否可被解释为大细胞通路缺陷的后果。
