Factor analysis of three standardised tests of memory in a clinical population
Hunkin NM, Stone JV, Isaac CL, Holdstock JS, Butterfield R, Wallis LI, and Mayes AR.
The aim of this study was to determine the factor structure of three
standardised memory tests: Wechsler Memory Scale-Revised (WMS-R),
Warrington Recognition Memory Test (WRMT), Doors and People Test
(D&P). We investigated whether these different standardised tests of
memory are consistent in their evaluation of memory function, and the
extent to which these tests discriminate between different memory
functions (e.g. recall/recognition and verbal/non-verbal memory).
Fifty patients with selective memory impairment were tested on the
WMS-R, WRMT and D&P.
Age-scaled scores from selective measures of these tests
(WMS-R-verbal, WMS-R-visual, WMS-R-delay, WRMT-words, WRMT-faces,
D&P-people, D&P-doors, D&P-shapes, D&P-names) were used as input to a
Maximum likelihood factor analysis yielded a three-factor solution
consistent with a theoretically motivated fractionation of memory
function into recall and recognition components. Recognition
performance, but not recall performance, showed dissociation into
visual and verbal components.
The WMS-R, WRMT and D&P are highly consistent in their assessment of
memory function. The results of the factor analysis are consistent
with a theoretically motivated fractionation of recall and recognition
memory. They are also partially consistent with a dissociation
between visual and verbal memory function.
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