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John C Dunn

Publications and source records attributed to John C Dunn.

5 recordsLinked to original sources
PubMed2006

Latent Semantic Analysis: an improved method to measure cognitive performance in subjects of Non-English-Speaking-Background.

The present study examined the validity of cognitive assessment in older adults when administered in a second language (English). A battery of tests that included the MMSE, CAMCOG and the Logical Memory Test of the Wechsler Memory Scale III, was administered to 121 older community volunteers of either an English Speaking Background (ESB) or a Non-English Speaking Background (NESB) living in the metropolitan area of Perth, Western Australia. The logical memory test was scored using Latent Semantic Analysis. It was hypothesized that this scoring method would be less affected by cultural and linguistic differences than standard scoring methods. The results suggest that LSA is a more robust measure of cognitive function than traditional scoring methods and may therefore improve the validity of cognitive assessment results on subjects of NESB.

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PubMed2004

Remember-know: a matter of confidence.

This article critically examines the view that the signal detection theory (SDT) interpretation of the remember-know (RK) paradigm has been ruled out by the evidence. The author evaluates 5 empirical arguments against a database of 72 studies reporting RK data under 400 different conditions. These arguments concern (a). the functional independence of remember and know rates, (b). the invariance of estimates of sensitivity, (c). the relationship between remember rates and overall hit and false alarm rates, (d). the relationship between RK responses and confidence judgments, and (e). dissociations between remember and overall hit rates. Each of these arguments is shown to be flawed, and despite being open to refutation, the SDT interpretation is consistent with existing data from both the RK and remember-know-guess paradigms and offers a basis for further theoretical development.

Humans↗
PubMed2002

Latent semantic analysis: a new method to measure prose recall.

The aim of this study was to compare traditional methods of scoring the Logical Memory test of the Wechsler Memory Scale-III with a new method based on Latent Semantic Analysis (LSA). LSA represents texts as vectors in a high-dimensional semantic space and the similarity of any two texts is measured by the cosine of the angle between their respective vectors. The Logical Memory test was administered to a sample of 72 elderly individuals, 14 of whom were classified as cognitively impaired by the Mini-Mental State Examination (MMSE). The results showed that LSA was at least as valid and sensitive as traditional measures. Partial correlations between prose recall measures and measures of cognitive function indicated that LSA explained all the relationship between Logical Memory and general cognitive function. This suggests that LSA may serve as an improved measure of prose recall.

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