Return to the Interpersonal Reactivity Index (IRI) page
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									INTERPERSONAL REACTIVITY INDEX (IRI)
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Script Author: Katja Borchert, Ph.D. (katjab@millisecond.com) for Millisecond Software, LLC
Date: 07-28-2016
last updated:  10-07-2019 by K. Borchert (katjab@millisecond.com) for Millisecond Software, LLC

Script Copyright © 10-07-2019 Millisecond Software

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BACKGROUND INFO 	
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This script implements a computerized version of the Interpersonal Reactivity Index (IRI) as described in:

Davis, M.H. (1979). INDIVIDUAL DIFFERENCES IN EMPATHY: A MULTIDIMENSIONAL APPROACH.
Dissertation (Scales published on p. 52).

Davis, M. H. (1983). Measuring individual differences in empathy: Evidence for a
multidimensional approach. Journal of Personality and Social Psychology, 44, 113–
126.

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OVERVIEW
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28 5-point Likert questions on 4 subscales (7 question per subscale) with two anchors
(A=Does not describe me well; E=Describes me very well). 

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DURATION 
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the default set-up of the script takes appr. 4 minutes 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: 'iri.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)
									Scale: 0 (does not describe me well) - 4 (describes me well)
									R = automatically reversed scored questions
									
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: 'iri_summary.iqdat' (Inquisit Lab: one data file per participant)

computer.platform:			the platform the script was run on (win/mac/ios/android)
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)

4 subscales (reversed scoring automatically done by computer) - Min: 0 - Max: 28 on each scale

expressions.PerspectiveTaking:the tendency to spontaneously adopt the psychological point of view of others
expressions.Fantasy:			taps respondents' tendencies to transpose themselves imaginatively into the feelings and actions of fictitious characters in books, movies, and plays
expressions.EmpathicConcern: assesses "other-oriented" feelings of sympathy and concern for unfortunate others
expressions.PersonalDistress:	measures "self-oriented" feelings of personal anxiety and unease in tense interpersonal settings


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QUESTIONNAIRE SET-UP & SCORING
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paper and pencil questionnaire: 
http://fetzer.org/sites/default/files/images/stories/pdf/selfmeasures/EMPATHY-InterpersonalReactivityIndex.pdf

28 5-point Likert Scale (A, B, C, D, E)
Scoring: (Note: computer scores reversed scored questions are automatically)
A = 0
B = 1
C = 2
D = 3
E = 4

Subscales (taken from Davis, 1983, p. 113):

Perspective Taking – the tendency to spontaneously adopt the psychological point of
view of others
Fantasy – taps respondents' tendencies to transpose themselves imaginatively into
the feelings and actions of fictitious characters in books, movies, and plays
Empathic Concern – assesses "other-oriented" feelings of sympathy and concern for
unfortunate others
Personal Distress – measures "self-oriented" feelings of personal anxiety and unease
in tense interpersonal settings

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EDITABLE CODE 
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check below for (relatively) easily editable parameters, stimuli, instructions etc. 
Keep in mind that you can use this script as a template and therefore always "mess" with the entire code 
to further customize your experiment.

The parameters you can change are:
check below for (relatively) easily editable parameters, stimuli, instructions etc. 
Keep in mind that you can use this script as a template and therefore always "mess" with the entire code to further customize your experiment.