DRM

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[edit] The PEBL Deese-Roediger-McDermott Task

This test is located in the PEBL test battery, in battery\DRM\DRM.pbl

[edit] About

This is an implementation (using free recall) of the classic DRM 'False Memory' test.

[edit] Notes

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

[edit] Options

Parameters can be set using the launcher parameter dialog. They include:

  • prestime (presentation time in ms--defaults to 1500 ms)
  • isi (time between each word in ms--150 ms default)
  • numlists (number of lists from drm-words.csv to use; default 24). This file contains all 24 lists used by Roediger & McDermott, which may take considerable time to test. You can choose to use a subset of these by picking a number less than 24. This number should be less than or equal to the number of rows is drm-words.csv.
  • samplelists (default 0). Whether the first numlists in drm-words.csv should be used, or if they should be sampled at random. Change to 1 to sample.
  • doratings (default 0). If non-zero, this will have participants do 'pleasantness' judgments to help encode better. This may not be effective in this sort of tasks, because all of the words are of a similar theme, and so participants may tend to give the same rating to everything on a list.

If you want to select a particular set of sublists, or create your own, edit the drm-words.csv file and set samplelists to 0, and numlists to the number of lists you have.

[edit] Data Output

A study log is recorded in data\X\drm-study-X.csv, and a recall log in data\X\drm-X.csv, where X is the participant code.

The study log looks like this:

sub  block  stimorder target	item	resp	abstime	rt
1	1	1	cold	warm	NA	5737	1766
1	1	2	cold	chilly	NA	7503	1767
1	1	3	cold	ice	NA	9270	1767
1	1	4	cold	heat	NA	11037	1767
1	1	5	cold	wet	NA	12804	1767
1	1	6	cold	snow	NA	14571	1767
1	1	7	cold	shiver	NA	16338	1767
1	1	8	cold	weather	NA	18105	1768
1	1	9	cold	winter	NA	19873	1768
1	1	10	cold	Arctic	NA	21641	1767
1	1	11	cold	air	NA	23408	1767
1	1	12	cold	frigid	NA	25175	1767
1	1	13	cold	hot	NA	26942	1767
1	1	14	cold	freeze	NA	28709	1767

Here, resp is NA unless the pleasantness ratings are used. abstime and rt indicates absolute and relative RT of the response (which should be fixed unless ratings are used).

The response log looks like this:

subnum	block	trial	target	resp	saidtarget	responlist	presorder   abstime	rt
1	1	1	cold	warm	0	         1	        1	    30489	1991
1	1	2	cold	chilly	0	         1	        2	    32491	1303
1	1	3	cold	ice	0	         1	        3	    33804	1028
1	1	4	cold	arctic	0	         0	       -1	    34842	3482
1	1	5	cold	freeze	0	         1	       14	    38334	1615
1	1	6	cold	igloo	0	         0	       -1	    39959	5552
1	1	7	cold	icicle	0	         0	       -1	    45521	2297

Here, saidtarget indicates whether the response was identical to the lure (i.e., cold); responlist indicates whether the response was actually studied; its serial study position is shown in presorder. abstime and rt give the absolute and relative response times. Absolute time is the same counter as in the study log, so study-delay times could be recorded.

[edit] References

  • Deese, J. (1959). On the prediction of occurrence of particular verbal intrusions in immediate recall. Journal of Experimental Psychology, 58, 17–22.
  • Roediger, H.L., & McDermott, K. B. (1995). Creating false memories: Remembering words not presented in lists. Journal of Experimental Psychology: Learning, Memory and Cognition, 24(4), 803–814. [1]

[edit] See Also

http://en.wikipedia.org/wiki/Deese%E2%80%93Roediger%E2%80%93McDermott_paradigm

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