We examine the visual processing of high-functioning adults with developmental dyslexia (mean Performance IQ = 126.5) and current phonological problems. In comparison to an age- and IQ-matched control group, the group with dyslexia showed deficits in two tasks associated with magnocellular/dorsal pathway function. For the 'frequency doubling' stimulus (grating of 0.25 cpd modulated at 25 Hz counterphase flicker), contrast thresholds for detection were raised in the dyslexic group. In conjunction visual search, a display time sufficient for controls to achieve ceiling accuracy at all set sizes (30 ms per item) was inadequate to allow shifts of attention around the display for the group with dyslexia. In contrast, normal performance was found on 'popout' visual search and on a ventral stream acuity task. Correlational analysis revealed a significant relationship between degree of deficit in conjunction search and phonological difficulty. The deficits revealed were specific to functions that rely on magnocellular input. They cannot be attributed to concentration lapses, eye movement problems or slow reaction times in the dyslexic group.

译文

:我们研究了患有阅读障碍(平均表现智商= 126.5)和目前的语音问题的高功能成年人的视觉处理。与年龄和智商相匹配的对照组相比,患有阅读障碍的组在与巨细胞/背侧通路功能相关的两项任务中表现出不足。对于“倍频”刺激(以25 Hz反相闪烁调制的0.25 cpd光栅),阅读困难组的检测阈值被提高。结合视觉搜索,在所有设置的尺寸(每项30毫秒)下,足以使控件达到最高天花板精确度的显示时间不足以允许阅读障碍者在显示器周围转移注意力。相反,在“弹出”视觉搜索和腹侧流敏锐度任务中发现正常表现。相关分析表明,联合搜索中的缺陷程度与语音困难之间存在显着的关系。所揭示的缺陷是特定于依赖于巨细胞输入的功能的。他们不能归因于阅读障碍者的注意力下降,眼球运动问题或反应时间慢。

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