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							 ALCOHOL STROOP TASK - with voice recording

last updated:  12-11-2015 by K.Borchert ( for Millisecond Software LLC
Copyright ©  12-11-2015 Millisecond Software


This script implements an Alcohol themed Stroop task as used by:

Bauer, D. & Cox, W.M. (1998). Alcohol-relatedwords are distracting to both alcohol abusers and 
non-abusers in the Stroop colournaming task. Addiction, 93, 1539–42.

Participant is presented words from 4 different categories (alcohol, neutral, positive, negative) in four different 
colors (blue, red, yellow, green) and is asked to say aloud the color of the words 
regardless of their meaning. At the end, participants are asked to rate how emotionally intense they find the words 

The default data stored in the data files are:

(1) Raw data file: 'AlcoholStroopWithVoiceRecording_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, blocknum:			the name and 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; by default data is collected unless /recorddata = false is set for a particular trial/block)					the currently selected target word
values.color:					the currently selected color
response:						the participant's response (scancode of responsekey)
correct:						the correctness of the response (1 = correct; 0 = incorrect)
latency: 						the response latency (in ms)

(2) Summary data file: 'AlcoholStroopWithVoiceRecording_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 (prematurely aborted); 1 = script was completed (all conditions run)

4 categories (alcohol words, positive words, negative words, neutral words) tested within subjects

1. Practice Block: 24 trials (this script uses the words "one" to "ten" as practice stimuli)
2. 2 x Test Block: 160 trials (= 4 categories x 10 stimuli per category x 4 repetitions); 
	* order is randomly determined
	* colors are randomly sampled for each word (Constraint: all colors appear equally often for each category)
	Note: repeat words can repeat colors)
	* fixation cross is presented for 500ms (default) -> target words are presented for a maximum of 1500ms
	* error feedback given; to remove follow instructions under TRIALS
3. In between the two Testblocks: 2min Rest period (optional, go to Editable Parameters-> Editable Values)
4. Ratings (optional, go to Editable Parameters -> Editable Values)

* original stimuli by Bauer & Cox (1998)

not original; can be easily altered under INSTRUCTIONS

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:

/skiprating:								0 = likert ratings are run (default); 1 = likert ratings are skipped
/skiprest:									0 = rest block is run (default) ; 1 = rest block is skipped

/maxtargetpresentationtime:					maximum time that target words are presented on screen (default: 1500ms)
/fixationcrosspresentationtime:				time that fixation cross is presented (default: 500ms)
/posttrialpause:							pause after each stroop trial (default: 0ms)
/restduration:								time to rest between stroop blocks (default: 120000ms)

the four colors used in this script:
/color1 = red
/color2 = green
/color3 = blue
/color4 = yellow

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