The present study administered a 15-item handedness questionnaire to 1
29 college students and their next-of-kin. This questionnaire was simi
lar to the Edinburgh Handedness Inventory, except that a 7-point scale
was used instead of a 2-choice scale. Test-retest reliability was eva
luated with a second administration of the handedness questionnaire to
each subject. Analysis showed a high test-retest reliability for all
items and a high correlation between subject and next-of-kin respondin
g for most items. However, some items on the Edinburgh Handedness Inve
ntory showed much higher correlations than others when comparing subje
ct and next-of-kin responding. The contribution of these data is that
subjects' handedness can be accurately estimated from next-of-kin resp
onses if a subset of these questionnaire items are used.