Figure 2

Analyses of magnitude comparison response times for fragile X premutation carriers (fXPCs) and healthy controls (HCs). (A) Group analyses of response time, controlled for manual motor simple reaction time performance, showed that male fXPCs, as a group, responded more slowly than HCs (P = 0.008). Response times adjusted for simple reaction time increased as the difference between the two blocks decreased (P<0.001), which did not differ between the two groups (P = 0.10). (B) Assessment of the association between performance and age (both groups) and CGG repeat length (in the male fXPCs); no significant associations were seen.