Proportion of Left-handers by : is, equal hand skill. figures show each of the groups proportion of left-handers, (B) proportion of left-handedness parents, (C) proportion of left-handed children with right-foot preference right-handed children with left-foot preference, and (D) the proportion of left-handed children with right-eye preference right-handed children with left-eye prefer-

doi:10.4324/9781410608314-55

Chapter

ABSTRACT

A m o n g the lefthanders, the same analysis showed that the CPMTlateral i ty index had a significant effect on three tasks (Table 4): Visual Recognition, Counting Dots , and Phonological Fluency. For all these tasks, the correlation coefficient between the three scores and the CPMTlaterali ty index was positive, which means that a lefthand advantage at C P M T has a negative effect. Among children with a strong lefthand ad vantage at C P M T (i.e., Group 1 in Figure 1), there was an additional significant l ink be tween the CPMTlaterali ty index and cognitive performance for two tasks: Visua l Recognition (F= 5.4; df= 1; 24, p = .03) and Reading Words (F= 8.4; df= 1; 11 ,p = .014), age being partialled out.