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This research aims to explore several aspects of verbal semantic degradation in Dementia of Alzheimer Type(DAT) patients. In this paper, the semantic deficit concerning [SEPARATION] verbs in DAT was studied in 12 DAT patients, compared with 12 matched control participants during an action naming task based on video-clips, an experimental design called APPROX. Concerning the related works of the language disorder in DAT, the majority of studies have focused on nominal production. Little is known about action semantics and verb production. However, there is growing evidence that verbs' related knowledge could be impaired in DAT as nominal concepts are. The responses produced by patients and healthy subjects were analyzed focused on the following distinctions: ① validity, ② specificity, ③ expectancy and ④ approximation. Our findings suggest that DAT patients have a progressive loss of the more conventional lexical items with a relative spare of approximative ones. We thus confirmed that non-canonical and anomalous responses reflect a progressive lack of both specificity and semantic relatedness regarding the target responses.