Handedness and intelligence: comparing intelligence (verbal and practical) and its subscales between left-handed and right-handed students

The relationship between handedness, intelligence and cognitive abilities has been of interest of many researchers for a long time. The aim of this study is to compare intelligence (verbal and practical) and its subscales scores based on handedness between two groups, left and right-handed. The sample comprised 120 graduate students who were randomly selected and measured by Edinburg's Handedness Inventory and Wechsler’s Adult Intelligence Scale. test and Multivariate analysis of variance showed that there is significant difference between the left-handed and right-handed in overall intelligence score (t=2.63, P<0.05), verbal intelligence (F=61.13, P<0.01), three of verbal intelligence subscales (Information, Digit span and comprehension) and some of practical intelligence subscales (picture completion, picture arrangement, block design). The total and verbal intelligence of the left-handed is more than the right-handed. But, the practical intelligence (F=0.021, P>0.05) and its two subscales (Object Assembly and coding) did not differ significantly between the two groups. This research could create appropriate learning environments and sensitivity to the complexity and the combination of cognitive, psychological and neurological excelled in terms of learning and intelligence help.