“…Some did not find differences regarding the measured performances, e.g., nonverbal intelligence, reading, and spelling (Mayringer & Wimmer, 2002), reading skills and intelligence (McManus, Sik, Cole, Mellon, Wong, & Kloss, 1988), drawing skills (Vlachos & Bonoti, 2004b), and writing performance (Vlachos & Bonofi, 2004a). Others pointed to differences between left-and right-handed children (depending on their hand preference across different tasks), i.e,, overrepresentation of left-handed children in the group of poor writers (Vlachos & Bonoti, 2004a) and poorer drawing performance of left-handed children (Karapetsas & Vlachos, 1997), Tan (1985) found that children lacking clear hand preference showed worse gross and fine motor performance, Karapetsas and Vlachos (1997) postulated difterences in brain development, in particular regarding the myelinisation of the corpus callosum and the lateralization of the brain, as possible reasons why children with right hand preference and girls showed better performances in certain periods of development, Crow, Crow, Done, and Leask (1998) assessed relative hand skill and referred to the point of equal hand skill as a point of "hemispheric indecision" (p. 1277).…”