Center for Research in Neuropsychology and Cognitive Behavioral Intervention

CHARACTERIZATION: EHI is a 10-item hetero or self-response inventory that determines handedness dominance in everyday activities. The items comprise tasks of writing, drawing, throwing, using scissors, a toothbrush, cutting with a knife, using spoon, the upper hand when using a broom, striking a match, and opening the lid of a box. STRUCTURE AND SCORING: The items are followed by two columns labelled “left” and “right”. Each item is answered in the “left” or “right” column either with “++” (strongly preference to use one hand for that task), “+” (weak preference for using one hand), or “+” in both columns if preference is indifferent. “++” is scored with 2 points and “+” with 1 point. A formula is applied for the Laterality Quotient: LQ = [(R – L)/(R+L) x 100]. The range of scores varies between -100 (preference of “strong left”) to +100 (preference of “strong right. PSICOMETRIC CHARACTERISTICS: Internal consistency, measured by Cronbach’s alpha was 0.88. Test-retest reliability was high (r = 0.97; p < .001). Confirmatory factor analysis denoted a one-factor solution (χ2/df = 2.14; TLI = 0.97; CFI = 0.98; RMSEA = 0.06).