A traditional spatial working memory task. Blocks on the screen are lit up, and the subject must reproduce the order they are lit in. A common variant is backward span, which is available by setting the direction parameter from 1 to -1 via the launcher dialog.
A video of the test in operation is here []
Located in battery/corsi/corsi.pbl
Many options are settable from the parameters dialog in the launcher.
dopractice|1|Whether to do a short practice round. Set from 1 to 0 to turn off for multi-session. direction|1|Direction of recall (forward=1, backward=-1) useCorsiPoints|1|Whether the block locations are identical to Corsi's (set from 1 to 0 to use random configuration.) useKessels|1|Whether to use the problems normed by Kessels. Should be used in concert with useCorsiPoint=1 startlength|2|Starting length to use if usekessels is 0. endlength|9|End length to use if useKessels is 0. timesperlength|2|Number of trials per length if useKessels is 0. isi|1000|Inter-stimulus interval in ms. iti|1000|Time between trials (inter-trial interval) in ms. usebeep|1|Should a beep play on each stimulus. Set from 1 to 0 to turn off.
 Data Output
In the version distributed with Test Battery 0.6, data is saved into the folder /data.
In this folder, a log file corsi-log.txt is saved that records every session run. It include infromation such as:
3,EN,Thu Apr 4 08:46:23 2013,CORSI,forward,INITIATED 3,EN,Thu Apr 4 08:46:24 2013,CORSI,forward,PRACTICETRIALS STARTED
Telling you basic parameters, timing, and participant codes.
Also, for each participant, a directory is created with their subject code. It contains three files:
corsi-direction-detailX.csv contains a click-by-click and item-by-item record; one per line. This data is probably more detailed than most people are interested in, but it would allow you to recontruct the entire sequence of responses and response timing perfectly.
subnum,direction,type,trialnum,order,trialstart,itemstart,itemend,abstime,rt,posx,posy 111,1,P,-1,1,9374,9982,608,608,1,620,495 111,1,P,-1,2,9374,10813,1439,575,3,770,390 111,1,P,-1,3,9374,11132,1758,63,5,650,300 111,1,P,-2,1,17310,19534,2224,2224,1,620,495 111,1,P,-2,2,17310,20149,2839,359,3,770,390 111,1,P,-2,3,17310,20603,3293,199,8,455,90 111,1,P,-3,1,26907,27654,747,747,6,815,210 111,1,P,-3,2,26907,28227,1320,315,7,275,180 111,1,P,-3,3,26907,28746,1839,262,9,635,120 111,1,T,1,1,34072,34795,723,723,8,455,90 111,1,T,1,2,34072,35372,1300,322,5,650,300 111,1,T,2,1,40547,41388,841,841,6,815,210 111,1,T,2,2,40547,42068,1521,424,4,440,360 111,1,T,3,1,48166,48724,558,558,4,440,360 111,1,T,3,2,48166,49099,933,118,7,275,180 111,1,T,3,3,48166,49533,1367,178,2,320,465 111,1,T,4,1,55570,56459,889,889,8,455,90
corsi-direction-trialX.csv contains a trial-by-trial summary, one per line. The third column 'P' indicates practice trials.
subnum,direction,type,trialnum,trialstart,length,stim,resp,numcorr,nummiss,allcorr,time 111,1,P,-1,9374,3,135,135,3,0,1,2386 111,1,P,-2,17310,3,248,138,1,2,0,4059 111,1,P,-3,26907,3,679,679,3,0,1,2589 111,1,T,1,34072,2,85,85,2,0,1,1935 111,1,T,2,40547,2,64,64,2,0,1,2077 111,1,T,3,48166,3,472,472,3,0,1,1865 111,1,T,4,55570,3,815,815,3,0,1,2494 111,1,T,5,64609,4,3417,3417,4,0,1,2671
stim and resp indicate the indices used for the responses.
Next, corsi-direction-data-summary_XX.txt shows basic summary information about the test, for each person. This summary data is collected in another pooled data file discussed below.
The PEBL Corsi Blocks Test, Version 0.2 http://pebl.sourceforge.net/battery.html. ============================================ Thank you for participating. Alert the Experimenter that you are done. Block Span: 5 Total Score: 35 Total Correct Trials: 7 Memory Span: 4.5
Next, in the summary\ folder, two files are saved that collect all data from all participants.
- corsi-DIRECTION-pooled.csv contains the same trial-by-trial summary as corsi-direction-trialXX.csv, but for all participants in the same file.
- corsi-DIRECTION-pooled-sum.csv contain the summary information, one line per participant run, along with a timestamp:
subcode,timedate,direction,numtrials,bsp,score,correct,msp 111,Wed Mar 19 11:06:57 2014,forward,11,5,35,7,4.5
Here, bsp indicates memory span computed as the best length at which the participant succeeded in average length of the trial, and msp is computed as (startlength + totalcorrect)/trialsperlength
- 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.