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									STROOP TASK - with keyboard input
										with Norwegian instructions
SCRIPT INFO

last updated:  05-31-2016 by K.Borchert (katjab@millisecond.com) for Millisecond Software LLC
Copyright ©  05-31-2016 Millisecond Software


BACKGROUND INFO

											*Purpose*
This script implements the a version of the classic Stroop Task with keyboard input.

Reference:
Stroop, J, R. (1935). Studies of interference in serial verbal reactions. Journal of Experimental Psychology, 18, 643-662.

											  *Task*
Participants are given color words written in color and are asked to indicate the color of the word (not its meaning) by key press
as fast as they can without making too many errors.
Congruent trials: color word and the color it is presented in are the same
Incongruent trials: color word and the color it is presented in are not the same
Control trials: colored rectangles


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

(1) Raw data file: 'StroopWithControlKeyboard_Norwegian_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) 
/congruencey:					1 = congruent; 2 = incongruent; 3 = control 
stimulusitem:					the presented stimuli in order of trial presentation
response:						the participant's response (scancode of response button)
correct:						the correctness of the response (1 = correct; 0 = incorrect)
latency: 						the response latency (in ms)


(2) Summary data file: 'StroopWithControlKeyboard_Norwegian_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)
/propcorrect:					overall proportion correct of all trials
/meanRT:						overall mean latency (in ms) of all correct trials
/meanRTcorr_congruent:			mean latency of all correct congruent trials (in ms)
/meanRTcorr_incongruent:		mean latency of all correct incongruent trials (in ms)
/meanRtcorr_control:			mean latency of all correct control trials (in ms)
/propcorrect_congruent:			proportion correct of congruent trials
/propcorrect_incongruent:		proportion correct of all incongruent trials
/propcorrect_control:			proportion correct of all control trials


EXPERIMENTAL SET-UP

1 Testblock with:
* 4 colors (red, green, blue, black) x 3 color-stim congruency (congruent, incongruent, control) x 7 repetitions = 84 trials
* trials are randomly sampled

Trial Timing:
- stimuli stay on screen until response (latencies are measured from onset of stimuli)
- intertrial interval of 200ms
- error feedback of 400ms

STIMULI
congruent/incongruent: color words
control: rectangle shapes

INSTRUCTIONS
are provided in Norwegian; see 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.


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