Rossiter, C; (2007) 'Penguins don't fly': An investigation into typicality and its effect on naming in aphasia. Doctoral thesis , UCL (University College London).

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Abstract

The study investigates typicality as a variable in naming for people with aphasia. Normative data was collected from 32 subjects to obtain overall mean typicality ratings for 167 items. The effect of typicality on naming for a group of 20 people with aphasia was then examined using matched sets and logistic regression analyses, for both the group as a whole, and individual participants. When potential confounding variables (frequency, familiarity, imageability, concreteness, age of acquisition and word length) were controlled using matched sets, a significant typicality effect was found for the group and two individual participants, demonstrating better naming for typical items. Logistic Regression analysis also showed a significant typicality effect for the group and five individuals, in the same direction. However, in both group and individual regression analyses, typicality was found to be a relatively weak naming predictor in comparison to other variables, particularly, age of acquisition, word length and operativity. The clinical and theoretical implications of these findings are discussed.

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