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For the \u2018frequency doubling\u2019 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 \u2018popout\u2019 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. Copyright \u00a9 2004 John Wiley &amp; Sons, Ltd.<\/jats:p>","DOI":"10.1002\/dys.263","type":"journal-article","created":{"date-parts":[[2004,1,23]],"date-time":"2004-01-23T08:00:54Z","timestamp":1074844854000},"page":"24-43","source":"Crossref","is-referenced-by-count":67,"title":["Adults with dyslexia show deficits on spatial frequency doubling and visual attention tasks"],"prefix":"10.1002","volume":"10","author":[{"given":"Judy","family":"Buchholz","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Elinor","family":"McKone","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2004,1,21]]},"reference":[{"key":"e_1_2_1_2_1","unstructured":"American Psychiatric Association. (2000)Diagnostic and Statistical MAnual of Mental Disorders (4th Edition) Text Revision. 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