Berg's Card Sorting Test

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Screen shot of PEBL's Berg Card Sorting Test


[edit] About

This is PEBL's version of the Wisconsin Card Sorting Test, sometimes referred to as simply WCST. It is a test long thought to involve reasoning, learning, and executive control. It is particularly sensitive to inability to shift set. We refer to our implementation of the Wisconsin Card Sorting Test as "Berg's Card Sorting Test" because the more common name, the "Wisconsin Card Sorting Test" is a registered trademark, and it was first developed by Esta Berg at the University of Wisconsin.

[edit] Notes

Versions of the test are located in battery\bcst\cardsort.pbl and battery\bcst\bcst-64.pbl

Initial versions of the BCST used keyboard input; now input can be performed either with the mouse or keyboard, by setting gUseMouse from 1 to 0.

Also, this test is localizeable into a particular language by editing a labels.txt file, located in the translations\ subdirectory. Translate the text strings in labels-en.txt, rename the file to label-XX.txt (where XX is whatever language you are translating to), and edit line 60 of the test to change the name of the file it is reading in. For languages that require using a different font, load fonts on the lines around line 500.

There are currently two versions of the test distributed in separate files in the Test battery. cardsort.pbl is the standard two-deck version, and bcst-64.pbl is a specific single-deck version that has the same sequence of cards/trials on every run.

[edit] Options

  • repeats affects how many times through the deck
  • runlength (default is 5) determines how many correct sorts are needed before the rule changes.
  • useCanonical determines whether the 4 stimulus cards are thesame as in Berg's original, or whether they are generated randomly.
  • useReduced eliminates ambiguous cards, as described by Nelson.

[edit] Data Output

Data are stored in bcst-<gsubnum>.txt. Detailed report stored in bcst-report-<gsubnum>.txt. Report calculates trials accuracy, number incorrect, perseverations on prior rule, and number of achieved categories.

Data in bcst-<gsubnum>.txt are in the following columns: Subnum trial run rule lastrule color shape number resp corr persev abstime rt

Sample report:

 Report for PEBL's _Berg's Card Sorting Task_,
 a free version of the Wisconsin Card Sorting Task (tm)*
 (c) 2008-2010 Shane T. Mueller
 Version 0.6
 PEBL Version 0.10
 Sun Mar 14 11:35:47 2010
 Participant Code: 0
Run length to move to next category: 10
Number of times through deck: 2
Deck Size: 64
Order of Cards: Rule 1  (color): Red Green Yellow Blue 
                Rule 2  (shape):  Triangle Star Cross Circle 
                Rule 3 (number):  1 2 3 4 
Statistic                    Value
1. Categories Completed/Experienced: 7 / 8
2. Number of Trials:             128
                            Total Percent Mean/Cat
3. Correct Responses:         103	80.46	12.875
4. Total Errors:              25	19.53	3.125
5. Perseverative Responses    32	25	4.571
6. Perseverative Errors       14	10.93	2
7. Non-Perseverative Errors   11	8.59	1.375
8. Unique Errors              3	2.34	0.375
8. Trials to complete 1st cat:   22
9. Failure to maintain set:     NOT COMPUTED
10. Learning to Learn:           NOT COMPUTED
11. Conceptual Level responses:  NOT COMPUTED
12. Perseverative Runs: Min    Max   Mean   Total
                         2      5     3   21
Stats 1-11 are standard statistics commonly
   reported.  #1 contains both categories completed (standard stat)
   and categories experienced, whether or not the last one was
   actually completed.  Means are computed based on categories
   experienced (not categories completed), and perseverative means
   based on categories experienced AFTER the first category usually a
   maximum of 8.  Total and percent for 1-11 are computed like the
   commonly-reported stats, to the best of our knowledge. #12,
   Perseverative runs, computes the number of error perseverations in
   a row at the beginning of each new category.
*PEBL, the PEBL test battery, and this test are unaffiliated with the Wells Printing Company 
or PAR Inc, the producers of the 'Wisconsin Card Sorting Test' (tm)


[edit] References

  • Berg, E. A. (1948). A simple objective technique for measuring flexibility in thinking. J. Gen. Psychol. 39: 15-22.
  • Nelson, H. E. (1976). A modified card sorting test sensitive to frontal lobe defects. Cortex, 12, 313-324.
  • Piper, B. J., Li, V., Eiwaz, M. A., Kobel, Y. V., Benice, T. S., Chu, A. M., Olsen, R. H. J., et al. (2011). Executive function on the Psychology Experiment Building Language tests. Behavior Research Methods. doi:10.3758/s13428-011-0096-6
  • Fox, C. J., Mueller, S. T., Gray, H. M., Raber, J., & Piper, B. J. (2013). Evaluation of a Short-Form of the Berg Card Sorting Test. PLoS ONE, 8(5), e63885. doi:10.1371/journal.pone.0063885

[edit] See Also

PEBL Test Battery

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