Return to the Evaluative Conditioning Task page
						
									Evaluative Conditioning Task
SCRIPT INFO

Script Author: Sean Draine, Ph.D. (seandr@millisecond.com) for Millisecond Software, LLC
last updated: 01-11-2016 by K.Borchert (katjab@millisecond.com) for Millisecond Software LLC

Copyright © 01-11-2016 Millisecond Software



BACKGROUND INFO

											*Purpose*

This script implements the Evaluative Conditioning Task as described in:

Olson, M.A. & Fazio, R.H. (2001). Implicit Attitude Formation through Classical Conditioning.
Psychological Science, 12, pp. 413-417.


											  *Task*
Participants view a slideshow of randomly presented words and pictures (or pairs thereof). They are instructed
to press the Spacebar whenever a target is presented (e.g. 'Sprite').
Amongst the presented items are pairings of positive unconditioned stimuli (e.g. positive words)
with a (to be) conditioned stimulus CS+ (e.g. 'coke') as well as pairings of negative unconditioned stimuli
with a (to be) condition stimulus CS- (e.g. 'pepsi').

The pairings of UCSs and CSs (here: Coke vs. Pepsi) are counterbalanced by groupnumber.


DATA FILE INFORMATION: 
The default data stored in the data files are:

(1) Raw data file: 'EvaluativeConditioning_raw*.iqdat' (a separate file for each participant)

build:							Inquisit build
computer.platform:				the platform the script was run on
date, time, subject, group:		date and time script was run with the current subject/groupnumber 
blockcode:						the name of the current block
values.currentblock:			the number of the current block
trialcode, trialnum: 			the name and number of the currently recorded trial
									(Note: not all trials that are run might record data) 
stimulusitem:					the presented stimuli in order of trial presentation
response:						the participant's response
latency: 						the response latency (in ms)

(2) Summary data file: 'EvaluativeConditioning_summary*.iqdat' (a separate file for each participant)

script.startdate:				date script was run
script.starttime:				time script was started
script.subjectid:				subject id number
script.groupid:					group id number
script.elapsedtime:				time it took to run script (in ms)
computer.platform:				the platform the script was run on
/completed:						0 = script was not completed; 1 = script was completed (all conditions run)
/meanRT_targets:				the overall mean latency of correct responses to all targets
/percentcorrect_targets:		the overall percent correct rate of target identifications


EXPERIMENTAL SET-UP
* 2 CS-UCS pairings (positive-Coke/negative-Pepsi vs. negative-Coke/positive-Pepsi) are tested between participants.
Assignment is done by groupnumer
* script runs 5 blocks - each block runs a different target (predetermined order)
* each block runs 86 trials: 60 distractors, 18 targets, 4 pairings of positive UCS and CS+, 4 pairings of negative UCS and CS-
order of the trials is randomly determined
* default stimulus/exposure duration: 1500ms (+ optional Intertrial Interval)

Note:
	The script uses the following category assignments:
	cs A: Coke
	cs B: Pepsi
	uc A: Positive
	uc B: negative 

	
STIMULI
all stimuli can be edited under section Editable Stimuli

INSTRUCTIONS
can be edited under section Editable Instructions

EDITABLE CODE:
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:

	exposureDuration:
		Controls trial duration, i.e., how many ms each stimulus remains on the screen. 
	csPicSize:
		Controls size of conditioned stimulus pictures (coke or pepsi).
	ucPicSize:
		Controls size of unconditioned stimulus pictures (negative or positive).
	ucFontHeight:
		Controls size of unconditioned text (negative or positive).
	defaultFontHeight:
		Specifies the height of distractor words.
	defaultPicSize :
		Controls the size of distractor, target, and blank stimuli. 
	ITI:
		optional Intertrial Interval in ms (default: 0ms)

Copyright © Millisecond Software. All rights reserved.
Contact | Terms of Service | Security Statement | Employment