Contrast sensitivity in dyslexia.
Contrast sensitivity in dyslexia.
复制标题
阅读障碍的对比敏感度。
DOI：
10.1017/s0952523800007380
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发表时间：
1995
影响因子：
1.9
通讯作者：
Rabin,M
中科院分区：
文献类型：
--
作者：
Gross-Glenn,K;Skottun,BC;Glenn,W;Kushch,A;Lingua,R;Dunbar,M;Jallad,B;Lubs,HA;Levin,B;Rabin,M
对比敏感度测定为阅读障碍和正常的读者。当测试与时间斜坡（即刺激与渐进的时间开始和偏移）光栅为0.6，4.0，和12.0个周期/度，我们发现没有差异的对比敏感度之间的阅读障碍和控制。使用12.0周期/度光栅与瞬态（即突然）的发病和偏移，我们发现，与对照组相比，睡眠障碍的个人，在最短的刺激持续时间（即17，34，和102毫秒）显着较差的对比敏感度。这种缺陷可能反映了更缓慢的时间总和。对具有瞬态起始和偏移的0.6周期/度光栅的灵敏度没有差异。在这些条件下，在较长的刺激持续时间下，相对于0.6个周期/度的斜坡基线条件，两组显示出一致且相等的灵敏度增加。这表明，阅读障碍的读者没有赤字，他们的能力，以检测刺激瞬变，这似乎是不一致的发现与瞬态系统赤字。低频刺激的检测是由瞬态系统介导的，这进一步表明，这些刺激比高频刺激更容易受到前向掩蔽的影响。高和低的空间频率刺激的掩蔽的影响是相等的阅读障碍和控制。这与瞬态系统缺陷理论不一致，根据该理论，人们会期望在阅读障碍的情况下对高空间频率刺激的掩蔽较少。
Contrast sensitivity was determined for dyslexic and normal readers. When testing with temporally ramped (i.e. stimuli with gradual temporal onsets and offsets) gratings of 0.6, 4.0, and 12.0 cycles/deg, we found no difference in contrast sensitivity between dyslexic readers and controls. Using 12.0 cycles/deg gratings with transient (i.e. abrupt) onsets and offsets, we found that dyslexic individuals had, compared to controls, markedly inferior contrast sensitivity at the shortest stimulus durations (i.e. 17, 34, and 102 ms). This deficit may reflect more sluggish temporal summation. There was no difference in sensitivity to 0.6 cycles/deg gratings with transient onsets and offsets. Under these conditions, the two groups showed a consistent and equal increase in sensitivity relative to the ramped baseline condition at 0.6 cycles/deg at the longer stimulus durations. This demonstrates that dyslexic readers have no deficit in their ability to detect stimulus transients, a finding which appears to be inconsistent with a transient system deficit. That detection of the low-frequency stimuli was mediated by the transient system is further indicated by the fact that these stimuli were more susceptible to forward masking than were the high-frequency stimuli. The effects of masking of both high and low spatial-frequency stimuli were about equal for dyslexic readers and controls. This is not in agreement with the transient system deficit theory, according to which one would expect there to be less masking of high spatial-frequency stimuli in the case of dyslexic readers.
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