Abstract
Aim: To determine category effect on naming in Alzheimer’s disease (AD) and its relation with severity of the disease or naming deficit. Methods: A group of 50 patients suffering from probable AD was tested in a naming task involving 99 pictures of items belonging to living and non-living categories. Parameters relating to pictures (percentage of majority responses, familiarity, visual complexity and image agreement) were determined using a control group and parameters relating to words (frequency, age of acquisition, number of letters and syllables) were controlled. Results: A category-specific effect was demonstrated and individual stepwise logistic regression demonstrated a significant category effect in 9 cases (living items more failed than non-living). Conclusion: Our results suggest a categorical effect on naming in favor of the non-living items, especially for mild AD with predominant naming deficit.
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