MEASUREMENT OF HANDEDNESS VIA SELF-REPORT - THE RELATIONSHIP BETWEEN BRIEF AND EXTENDED INVENTORIES

Three self-report measures of handedness were explored. For simple dic hotomous classification into right- versus left-handed groups, a brief (4-item) and an extended (12-item) inventory produced 98.8% classific ation concordance in a sample of 250 subjects. When handedness was tre ated as a continuous variable, indexes based upon the short and expand ed scales correlated highly (r = 0.95). A single-item handedness measu re was also created which produced handedness classifications which we re better than 97% concordant with the brief and extended handedness s cales for dichotomous classification. The methodological implications of these findings for handedness measurement are discussed.