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					MULTI SOURCE INTERFERENCE TASK (MSIT) - (with single-colored items, fixed order)
SCRIPT INFO

This script was generously provided by Mario Wenzel, Thomas Kubiak and Tamlin Conner to be shared via Millisecond
Software's Script Library. Thank you!

last updated:  11-17-2015 by K.Borchert (katjab@millisecond.com) for Millisecond Software LLC

Copyright ©  11-17-2015 Millisecond Software


BACKGROUND INFO

											*Purpose*
This script implements a Multi Source Interference Task (MSIT) with black/white stimuli and a fixed order
of stimuli presentation similarly (but not identical) to the procedure described in:

Bush, G., Shin, L. M., Holmes, J., Rosen, B. R., & Vogt, B. A. (2003). The Multi-Source Interference Task: 
validation study with fMRI in individual subjects. Molecular Psychiatry, 8, 60-70.

Stins, J.F., Leeuwen, W.M.A. van & Geus, J.C.N. de (2005). The multi-source interference task: 
the effect of randomization. Journal of Clinical and Experimental Neuropsychology, 27, 711-717.


											  *Task*
Participants are presented stimuli consisting of 3 digits (1, 2, 3s) (or 1 digit and 2 X's = controls). 
One of the digits is different from the flanking digits and differs in size. Participants are asked to press
a response button (1, 2, 3) as fast as possible to report which digit was different.



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

(1) Raw data file: 'MSITfixedNC_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) 
stimulusitem:					the presented stimuli in order of trial presentation
response:						the participant's response (scancode of response)
									2,79 => 1
									3, 80 => 2
									4, 81 => 3
correct:						the correctness of the response (1 = correct; 0 = incorrect)
latency: 						the response latency in ms (measured from onset of stimulus)

(2) Summary data file: 'MSITfixedNC_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:					proportion correct overall
/meanRT:						mean latency (in ms) of all correct responses
/Std:							standard deviation of all correct latencies
/medianRT:						median latency (in ms) of all correct responses


EXPERIMENTAL SET-UP
- This script runs 39 trials (3 control, 12 uni-source, 24 multi-source) in a fixed order.
- response buttons: 1, 2, 3 on keyboard and/or numeric pad

Trial Sequence:
- fixation cross for 500ms
- stimulus presented for 2000ms
- accuracy feedback 500ms after response or stimulus timeout 

STIMULI
all stimuli are provided by Mario Wenzel, Thomas Kubiak and Tamlin Conner

control (target always printed larger): 3 (1 fontsize x 1 identities of flanking letters x 3 target digits x 1 possible positions of target digit)
uni-source (target position and response key position are congruent): 12 (2 fontsizes x 2 identities of flanking numbers x 3 target digits x 1 possible positions of target digit)
multi-source (target position and response key position are incongruent): 24 (2 fontsizes x 2 identities of flanking numbers x 3 target digits x 2 possible positions of target digit)

INSTRUCTIONS
instructions are provided by Mario Wenzel, Thomas Kubiak and Tamlin Conner
and can be edited under EDITABLE CODE -> 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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