This research evaluates the memory performance of (monolingual, bilingual) Alzheimer patients and normal individuals through a digit backward test. The present research is applied and retrospective. It is causal comparative in its data collection. Its statistical population comprised (monolingual and bilingual) Alzheimer patients living in nursing homes or centers for caring Alzheimer patients in Fars province (2017). 90 people were considered as sample, including 60 people with (monolingual, bilingual) Alzheimer and 30 normal people as a comparison group. The measuring tools of the research were the psychological status questionnaire of the MMSE test and the digit backward span test (DBST) for working memory (WM). As for analyzing the data, this research used descriptive statistics such as mean, standard deviation, frequency, and minimum and maximum percentages according to the questions and hypotheses. Univariate analysis of variance test was used at the inferential level. The findings showed there is a significant difference between memory spans in all groups. The average of the group of normal individuals is higher than the bilingual ones with Alzheimer, and the average of the group of bilingual individuals with Alzheimer's is more than the group of monolingual ones with Alzheimer’s.
