Ebbinghaus

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A screenshot of PEBL's Ebbinghaus task.

Contents

[edit] About

This is a short (5-10 minute) experiment replicating some of the basics of Ebbinghaus's famous self-experiments. It gives lists of CVCs repeatedly until the subject gets them correct twice, then moves on to a new list. It then repeats the same lists, to allow 'savings' to be computed.

[edit] Notes

This task is located in battery/ebbinghaus/ebbinghaus.pbl

[edit] Options

  ##How many lists? (each repeated twice)
  numlists <- 2
 
  length <- 8  ##Should be 8, 12, or maybe 16
  cond <- GetEasyChoice("Select stimulus set to use:",["Nonsense CVS","3-letter Words"],["cvcs","words"],gWin)

[edit] Data Output

Data are saved to the file "data/" folder, in a subfolder named based on the participant code. The filename is ebbing-"+gSubNum+"-"+cond+".csv".


Samplesave file is:

subNum,trial,corr,list,resplist,corrorder,resp,rounds,abstime,rt
3333,1,5,HAS,FOG,TAX,TIC,TOP,PUN,FOR,DIG,HAS,FOG,TAX,TIC,TOP,FOR,DIG,PUN,6,8,7,1,4,3,5,2,1,27193,19617
3333,1,5,HAS,FOG,TAX,TIC,TOP,PUN,FOR,DIG,HAS,TOP,TAX,TIC,PUN,FOG,FOR,DIG,4,8,7,1,6,3,5,2,2,51094,43518
3333,1,8,HAS,FOG,TAX,TIC,TOP,PUN,FOR,DIG,HAS,FOG,TAX,TIC,TOP,PUN,FOR,DIG,2,4,5,3,7,6,8,1,3,68340,60764
3333,1,8,HAS,FOG,TAX,TIC,TOP,PUN,FOR,DIG,HAS,FOG,TAX,TIC,TOP,PUN,FOR,DIG,1,5,6,3,7,8,4,2,4,84612,77036
3333,2,1,BOP,HUM,HAW,PRY,PER,PEW,BOT,COT,BOP,HAW,HUM,PER,PEW,COT,PRY,BOT,8,2,4,1,5,7,3,6,1,109145,23005
3333,2,4,BOP,HUM,HAW,PRY,PER,PEW,BOT,COT,BOT,HUM,HAW,PRY,PEW,PER,BOP,COT,7,2,8,4,3,1,6,5,2,136409,50269
3333,2,8,BOP,HUM,HAW,PRY,PER,PEW,BOT,COT,BOP,HUM,HAW,PRY,PER,PEW,BOT,COT,4,1,7,2,6,5,3,8,3,152686,66546
3333,2,8,BOP,HUM,HAW,PRY,PER,PEW,BOT,COT,BOP,HUM,HAW,PRY,PER,PEW,BOT,COT,5,3,6,4,2,1,7,8,4,169574,83434
3333,3,8,HAS,FOG,TAX,TIC,TOP,PUN,FOR,DIG,HAS,FOG,TAX,TIC,TOP,PUN,FOR,DIG,3,1,2,8,7,5,6,4,1,196290,21895
3333,3,8,HAS,FOG,TAX,TIC,TOP,PUN,FOR,DIG,HAS,FOG,TAX,TIC,TOP,PUN,FOR,DIG,6,4,1,2,5,7,8,3,2,213076,38681
3333,4,8,BOP,HUM,HAW,PRY,PER,PEW,BOT,COT,BOP,HUM,HAW,PRY,PER,PEW,BOT,COT,1,5,3,6,2,8,4,7,1,230021,15417
3333,4,8,BOP,HUM,HAW,PRY,PER,PEW,BOT,COT,BOP,HUM,HAW,PRY,PER,PEW,BOT,COT,1,5,3,6,2,8,4,7,1,230021,15417

Here, after subject code and trial number (list) ID), it records the number correct, then the presented list (8 columns) followed by the remembered list (8 columns), The next 8 columns show the order the words appeared on the response screen. The nexc column records which round of the trial you are on, then the absolutet time since the beginning of the experiment (in ms), and finally the time relative to the beginning of the trial. Because this was designed mostly as a demonstration for a graduate student course, you may need some additional coding to permit you to easily compute savings as Ebbinghaus did. But in the case above, the 'has' list took four rounds to learn to criterion twice the first time; the second time it was learned on the first round. This is a savings of 2 rounds of study. For the BOP list, we also have a savings of 2.

[edit] References

Ebbinghaus, H. (1913). Memory. A Contribution to Experimental Psychology. New York: Teachers College, Columbia University.

[edit] See Also

PEBL Test Battery

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