Return to the Edinburgh Handedness Inventory page
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								*Edinburgh Handedness Inventory*
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Script Author: Katja Borchert, Ph.D. (katjab@millisecond.com) for Millisecond Software, LLC
last updated:  12-21-2020 by K. Borchert (katjab@millisecond.com) for Millisecond Software, LLC

Script Copyright © 12-21-2020 Millisecond Software

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BACKGROUND INFO 	
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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.
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OVERVIEW
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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

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DURATION 
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the default set-up of the script takes appr. 1 minute to complete

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DATA FILE INFORMATION 
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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)

computer.platform:					the platform the script was run on (win/mac/ios/android)
inquisit.build:						the version/build of Inquisit
script.startdate:					date script was run
script.starttime:					time script was started
script.subjectid:					assigned subject id number
script.groupid:						assigned group id number
script.sessionid:					assigned session id number
script.elapsedtime:					time it took to run script (in ms); measured from onset to offset of script
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									

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QUESTIONNAIRE SET-UP & SCORING
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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)