psychotools (version 0.7-4)

MemoryDeficits: Memory Deficits in Psychiatric Patients

Description

Response frequencies of 96 patients who took part in a pair-clustering experiment to assess their memory deficits.

Usage

data("MemoryDeficits")

Format

A data frame containing 576 observations on 7 variables.

ID

Participant ID.

group

Factor with four levels specifying patient or control group of participant.

trial

Trial number from 1 to 6.

E1

Number of pairs recalled adjacently.

E2

Number of pairs recalled non-adjacently.

E3

Number of single pair members recalled.

E4

Number of non-recalled pairs.

Details

Riefer, Knapp, Batchelder, Bamber and Manifold (2002) report a study on memory deficits in schizophrenic (n = 29) and organic alcoholic (n = 21) patients who were compared to two matched control groups (n = 25, n = 21). Participants were presented with 20 pairs of semantically related words. In a later memory test, they freely recalled the presented words. This procedure was repeated for a total of six study and test trials. Responses were classified into four categories: both words in a pair are recalled adjacently (E1) or non-adjacently (E2), one word in a pair is recalled (E3), neither word in a pair is recalled (E4).

References

Riefer DM, Knapp BR, Batchelder WH, Bamber D, Manifold V (2002). Cognitive Psychometrics: Assessing Storage and Retrieval Deficits in Special Populations with Multinomial Processing Tree Models. Psychological Assessment, 14, 184--201.

Examples

data("MemoryDeficits", package = "psychotools")
aggregate(cbind(E1, E2, E3, E4) ~ trial + group, MemoryDeficits, sum)