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Corsi Block-Tapping Task (Forward) - Eye Tracking
(including normative data)
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Script Author: David Nitz (dave@millisecond.com) for Millisecond Software, LLC (backward task)
last updated: 03-02-2022 by K. Borchert (katjab@millisecond.com) for Millisecond Software, LLC
Script Copyright © 03-02-2022 Millisecond Softwaree
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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 script provides normative data (Kessels et al, 2000)
The implemented procedure is 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 same order they were lit.
The sequence length starts at level = 2 boxes and can increase to up to level 9. Participants get 2 chances
at each sequence length. If one of the sequences was entered correctly, 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_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
session: with the current session id
agegroup: stores the age group information IF parameters.runAgeQuestion is set to 'true'
1: age <= 20;
2: 21 < age < 40;
3: age > 40
Note: based on Kessels et al (2000, table3). Due to overlapping age brackets reported in Kessels
et al (2000, table 3) for age group 1 and 2, in this script age group 1 includes age 20
and age group 2 starts at age 21
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 (forward)
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)
eyetracker.lasttimestamp: eyetracker timestamp
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.(Max = 16)
blockspan The achieved Block Span. Equals the length of the last correctly recalled sequence (Max = 9)
totalscore Summary score proposed by Kessels et al. (2000). Computed as
'blockspan' * 'ncorrecttotal'.(Max = 9 * 16 = 144)
(2) Summary data file: 'corsiblocktappingtask_summary*.iqdat' (a separate file for each participant)
inquisit.version: Inquisit version run
computer.platform: the platform the script was run on (win/mac/ios/android)
startdate: date script was run
starttime: time script was started
subjectid: assigned subject id number
groupid: assigned group id number
sessionid: assigned session id number
elapsedtime: time it took to run script (in ms); measured from onset to offset of 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.
blockspan The achieved Block Span. Equals the length of the last correctly recalled sequence (Max = 9)
z_Blockspan: the z-score of the obtained Blockspan with mean (6.2) and SD (1.3) (see Kessels et al, 2000, table 2)
p_blockspan: the percentile of the obtained Blockspan z-score
totalscore Summary score proposed by Kessels et al. (2000). Computed as 'blockspan' * 'ncorrecttotal'.
z_Totalscore: the z-score of the obtained Totalscore with mean (55.7) and SD (20.3) (see Kessels et al, 2000, table 2)
p_Totalscore: the percentile of the obtained Totalscore z-score
ageGroup: stores the age group information IF parameters.runAgeQuestion is set to 'true'
1: age <= 20;
2: 21 < age < 40;
3: age > 40
Note: based on Kessels et al (2000, table3). Due to overlapping age brackets reported in Kessels
et al (2000, table 3) for age group 1 and 2, in this script age group 1 includes age 20
and age group 2 starts at age 21
p_Totalscore_byAge: the interpolated totalscore percentile based on age (see Kessels et al, 2000, table 3)
Note: only calculated if parameters.runAgeQuestion is set to 'true' (default)
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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 9
* 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.
runAgeQuestion true (1): the user's age can be entered in a textbox before running the task (default)
false (0): no age information of the participant is sought
