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Accompanying materials

Dutilh, G., Vandekerckhove, J., Tuerlinckx, F., & Wagenmakers, E.-J. (2009). A diffusion model decomposition of the practice effect. Psychonomic Bulletin & Review, 16, 1026-1036. [pdf]

Archive A: Bayesian Diffusion Model
Archive B: Results for Variability Parameters
Archive C: Model fit
Archive D: Results for Errors

Concise information on the experiment (formore info, see paper above) 4 participants : two accuracy stressed (A1 & A2) and twospeed stressed (S1 & S2). 25 practice blocks 400 trials per block, 200 words, 200 nonwords, same stimuli each block.

Donwload the data as text file

Variables in .txt-file

name

participant code (A1, A2, S1, S2)

block

practice block (1-25)

trialnr

trialnumber withinblock

stim

letter string presented

wnw

1 means word, 2 means non-word

freq

frequency of word in Dutch

resp

response given (1=word, 2=nonword)

RT

response time (milliseconds)
correct 1 meanscorrect,0 means incorrect

Feel free to play with it! Please contact me if you have questions, or when you discover something cool.