Corsi Blocks

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Screen shot of PEBL's Corsi Block Test

Contents

[edit] About

A traditional spatial working memory task. Blocks on the screen are lit up, and the subject must reproduce the order they are lit in.

[edit] Notes

Located in battery/corsi/corsi.pbl

[edit] Options

Many options are settable near the beginning of the corsi.pbl file. Open it with a text editor and change the options.



  gDoPractice <- 1           ##Turn on/off practice trials (useful for multi-session
  gDirection <- 1            ##Change 1 to -1 to set forward to backward.
  
  gUseCorsiPoints <- 1        ## Use standard locations or regenerate
                              ## on each trial?


  ##By default, this uses Kessel's recommendations.  
  ##Basically, start at length 2, use 2 trials per length, and
  ##continue to the next length whenever at least one was recalled
  ##correctly.
 
  gUseKessels      <- 1        ## Use Kessel trials? (Should be used
                              ## with corsi points)


  ##alternately, you can generate the trials at random.

  gStartLength    <- 2        ## If gUseKessels <- 0, it creates a
                              ## random stimulus sequence with these parameters
  gEndLength      <- 9
  gTimesPerLength <- 2        ##


  gISI <- 1000                ## Inter-stimulus interval in ms
  gITI <- 1000                ## inter-trial interval.
  gWait <- 500                ## Not used

  gUseBeep <- 1               ##should a beep play?

 gStimColor    <- Makecolor("navy")
 gHighlightColor <-MakeColor("khaki")

[edit] 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
  • corsi-direction-trialX.csv
  • corsi-direction-data-summary_X.txt


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

[edit] References

  • 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.

[edit] See Also

http://peblblog.blogspot.com/2010/07/corsi-block-tapping-test.html

PEBL Test Battery

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