A validation study on the contextual memory test

Pao Yue-kong Library Electronic Theses Database

A validation study on the contextual memory test


Author: Wong, Sai-mai
Title: A validation study on the contextual memory test
Degree: M.Sc.
Year: 2002
Subject: Hong Kong Polytechnic University -- Dissertations
Neuropsychological tests
Memory -- Testing
Brain damage -- Patients -- Rehabilitation
Department: Multi-disciplinary Studies
Dept. of Rehabilitation Sciences
Pages: xvii, 253 leaves : ill. ; 30 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b1658982
URI: http://theses.lib.polyu.edu.hk/handle/200/1733
Abstract: Cognitive rehabilitation, particularly memory training, has been an integral duties of occupational therapists working with the brain-injured persons suffering from traumatic brain injuries, brain tumor, stroke, dementia, epilepsy and Parkison's disease, etc. Much works had been done by us in identifying and adapting suitable measurement instruments on memory to assist in accurate problem identification. The purpose of this study aimed at translating the Contextual Memory Test (CMT) into Chinese version and to gather evidence on its construct validity using a Messick's model for a group of individuals with brain injuries in Hong Kong. The study began with a description of the theoretical construct of memory and its relation with the CMT in the literature review. This was followed by the evaluation of the translation equivalence of CMT-Chinese version (CMT-CV) by altogether 3 groups of expert panels (two working on monolingual review and one group on bilingual review). Revision of 6 items in the questionnaire was carried out with reference to the statistical analysis and written comments from the experts. Cortstruct validity of the instrument was gathered through the evaluation of the content-related, structural-related and external validity of the CMT-CV. Three groups of experts were invited to study on the content-related validity of the instrument (two working on the content relevance of the pictures in relation to their thematic context and one on the CMT-CV as a whole). Results from the panels working on pictures were quite controversial and revision of 5 items in each version had been made. Fortunately, there was much more consensus on the group working on the content-related evidence of the CMT-CV except in the area related to 'long term memory'. While the panel review helped to provide qualitative suggestions on the way to improve the content areas being measured, the structural-related evidence provided further statistical evidence on the item quality of the CMT-CV though a field test in which a total of 92 individuals with brain injury were recruited. Results of item analysis suggested two items in the immediate recall and one item in the delayed recall in 'morning' version failed to achieve an acceptable item difficulty as well as discrimination value. With the deletion of these items, the alpha value remained unchanged. Concerning the item analysis on the questionnaire of the CMT-CV, the items addressing 'use of memory strategies' and 'metamemory' possessed adequate discrimination power and internal consistency. The high correlation between the recall scores of the CMT-CV and the RBMT-CV provided further evidence to substantiate the validity of the instrument in measuring memory function in a daily context. The investigation on the psychometric properties of the CMT-CV ended up with the study of the parallel form reliability of the CMT-CV. The results indicated the two versions belonged to the same construct and could be used interchangeably. Further analysis on and comparison of the performance limits, effect of age and education as well as the interaction among the three variables of the current study with the original version indicated that there was no statistical significant difference between the performances in the two cultures. As a summary, this study had gathered evidences on the construct validity of the CMT-CV on the assessment of memory, use of memory strategies and metamemory of the brain-injured individuals of Hong Kong. Further researches in the future were recommended so as to enhance the psychometric properties of such instrument to a greater extent.

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