Return to the Corsi Block Tapping Task (Backwards) page
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									Corsi Block-Tapping Task (Backwards)
									(in German)
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Script Author: Katja Borchert, Ph.D. (katjab@millisecond.com) for Millisecond Software, LLC (backward task)
Script uses in large part the code of the Forward Corsi Block Tapping Task written by David Nitz (dave@millisecond.com)

last updated:  11-08-2019 by K. Borchert (katjab@millisecond.com) for Millisecond Software, LLC
Script Copyright © 11-08-2019 Millisecond Software

Translation by K. Borchert for Millisecond Software

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BACKGROUND INFO 	
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	This script implements the Forward Corsi Block Tapping Task; a measure of spatial working memory.
	
	The implemented procedure is described in:

	Kessels, R.P.C., van den Berg, E., Ruis, C., & Brands, A.M. A. (2008). "The Backward Span of 
	the Corsi Block-Tapping Task and Its Association With the WAIS-III Digit Span". Assessment, 15, 426–34.


	The script builds on the original Inquisit Corsi Block Tapping Task that implements the (forward) 
	Corsi Block Tapping Task as described in:

	Kessels, R.P.C., van Zandvoort, M.J.E., Postma, A., Kappelle, L.J., & de Haan, E.H.F. (2000).
	The Corsi block-tapping task: Standardization and normative data. Applied Neuropsychology,
	7(4), 252-258.

	Corsi, P. M. (1972). Human memory and the medial temporal region of the brain. 
	Dissertation Abstracts International, 34, 819B.

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TASK DESCRIPTION	
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Participants are presented with a screen of 9 boxes. The boxes light up in a pre-fixed sequence (constant across participants)
and participants are asked to click on the boxes in the REVERSED order.
The sequence length starts at level = 2 boxes and can increase to up to level 8. Participants get 2 chances
at each sequence length. If one of the sequences was entered correctly (that is in reversed fashion),
the next sequence starts. 

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DURATION 
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the default set-up of the script takes appr. 5 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: 'corsiblocktappingtask_backwards_german_raw*.iqdat' (a separate file for each participant)

build:							The specific Inquisit version used (the 'build') that was run
computer.platform:				the platform the script was run on (win/mac/ios/android)
date, time, 						date and time script was run 
subject, group, 					with the current subject/groupnumber
script.sessionid:					with the current session id

blockcode, blocknum:				the name and number of the current block (built-in Inquisit variable)
trialcode, trialnum: 				the name and number of the currently recorded trial (built-in Inquisit variable)
										Note: trialnum is a built-in Inquisit variable; it counts all trials run; even those
										that do not store data to the data file such as feedback trials. Thus, trialnum 
										may not reflect the number of main trials run per block. 
										
seqnumber						The ordinal index number of the current block sequence. A maximum of 14 sequences are given in ascending order.
seqlength						Length of the current block sequence.
seqstring						The current sequence (stored forward)
seqstring_backwards				The current sequence (stored backwards).
respstring						The sequence entered by the participant (resets for each new sequence)
response						the response of the participant in a given trial

correct							'1' if the current sequence was recalled correctly. '0' if the participant
								made a mistake.
								
latency							the latency of the response (in ms)

ncorrectinblock					Holds the number of correctly recalled sequences in the current block.
									Sequences are given in blocks of two. The task stops as soon as the 
									participant fails to recall two sequences of equal length.
									
ncorrecttotal						Total number of correctly recalled sequences across the whole task.
									Note: for the backward Corsi with levels 2-8, the max number of correctly recalled sequences = 14
									
blockspan						The achieved Block Span. Equals the length of the last correctly recalled sequence.

totalscore						Summary score proposed by Kessels et al. (2000). Computed as 
								'values.blockspan' * 'values.ncorrecttotal'.

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

ncorrecttotal						Total number of correctly recalled sequences across the whole task.
										Note: for the backward Corsi with levels 2-8, the max number of correctly recalled sequences = 14
										
blockspan						The achieved Block Span. Equals the length of the last correctly recalled sequence.
totalscore						Summary score proposed by Kessels et al. (2000). Computed as 'values.blockspan' * 'values.ncorrecttotal'.

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EXPERIMENTAL SET-UP 
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* predetermined sequence of boxes (see section Editable Lists)
* start level N=2 up to level 8
* 2 chances per level	

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INSTRUCTIONS 
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see section Editable Instructions

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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:

	blockcolor				Display color for blocks in unhighlighted state.
	tapcolor					Display color for currently highlighted ('tapped') blocks.
	boardcolor				Display color for the virtual game board.
	blocksize				Size of blocks in % of canvassize.
	
	showfeedback			'true' -> show performance feedback after each completed sequence.
							'false' -> don't show performance feedback after each completed sequence.
							Default is 'true'.
							
	showscores				'true' -> show score summary at the end of the procedure.
							'false' -> don't show score summary at the end of the procedure.
							Default is 'true'.
							
	tapinterval				Interval between 'taps' in ms. Default is '1000'.
	
	posttapinterval			Time between erasing a previously highlighted block and highlighting the 
							next one in ms.
							
	feedbackduration			Duration of performance feedback after recalling a sequence.