___________________________________________________________________________________________________________________ *Edinburgh Handedness Inventory* ___________________________________________________________________________________________________________________ Script Author: Katja Borchert, Ph.D. (katjab@millisecond.com) for Millisecond Software, LLC last updated: 02-22-2022 by K. Borchert (katjab@millisecond.com) for Millisecond Software, LLC Script Copyright © 02-22-2022 Millisecond Software ___________________________________________________________________________________________________________________ BACKGROUND INFO ___________________________________________________________________________________________________________________ This script implements a handedness survey based on the Edinburgh Handedness Inventory (Oldfield, 1971). Reference: Oldfield, R.C. (1971). The assessment and analysis of handedness: The Edinburgh inventory. Neuropsychologia, 9, 97-113. ___________________________________________________________________________________________________________________ OVERVIEW ___________________________________________________________________________________________________________________ 10* 5-point Likert choice questions that ask about handedness. The response scale -2, -1-, 0, 1, 2 mimics the * the last two questions from Oldfield (1971) were dropped from the default Inquisit implementation ___________________________________________________________________________________________________________________ DURATION ___________________________________________________________________________________________________________________ the default set-up of the script takes appr. 1 minute to complete ___________________________________________________________________________________________________________________ DATA FILE INFORMATION ___________________________________________________________________________________________________________________ The default data stored in the data files are: (1) Raw data file: 'edinburghhandednessinventory.iqdat' date, time: date and time script was run with the current group/subjectnumber subject, group, session: with the current subject/groupnumber/session id build: the Inquisit build q*_response: response given (in assigned values) for q1-q10 Scale: -2 (strong left preference) - +2 (strong right preference) q*_latency: how much time (in ms) the participant spent on the surveypage with this particular question (the last time this particular surveypage was visited) (2) Summary data file: 'edinburghhandednessinventory_summary.iqdat' (Inquisit Lab: one data file per participant) inquisit.version: Inquisit version run computer.platform: the platform the script was run on (win/mac/ios/android) startDate: date script was run startTime: time script was started subjectid: assigned subject id number groupid: assigned group id number sessionid: assigned session id number elapsedTime: time it took to run script (in ms); measured from onset to offset of script completed: 0 = script was not completed (prematurely aborted); 1 = script was completed (all conditions run) ehi_countMissingitems: the number of questions that have not been answered Note: by default settings, all questions are required to be answered. However, that setting can be changed. If default setting is changed, the above variable can be used as a flag. //see Oldsfield (1971, p.99, p.112) for scoring leftScore: the sum of all "+" for the left hand Note: -a score of "-2" adds 2 to the number of "+" for the left hand -a score of "-1" adds 1 to the number of "+" for the left hand -a score of "0" adds 1 to the number of "+" for the left hand rightScore: the sum of all "+" for the right hand Note: -a score of "2" adds 2 to the number of "+" for the right hand -a score of "1" adds 1 to the number of "+" for the right hand -a score of "0" adds 1 to the number of "+" for the right hand ehi_LQ: the Laterality Quotient (= 100 * [(rightScore-leftScore)/(rightScore+leftScore)]) Range: -100 (strong left preference) -50 (left preference) 0 (no preference) +50 (right preference) +100 (strong right preference) + individual responses to all 10 questions ___________________________________________________________________________________________________________________ QUESTIONNAIRE SET-UP & SCORING ___________________________________________________________________________________________________________________ 10 5-point Likert choice questions that ask about handedness. The response scale is selected to mimic "++" for indicating a 'strong' hand preference and "+" for a simple hand preference . No preference (0) leads to adding a "+" to either handscore. (see Oldsfield, 1971, p.99/112)