2.5. Rey auditory verbal learning test

The Rey auditory verbal learning test (RAVLT) is a standard neuropsychological verbal memory test that had been widely used as a proxy for episodic memory functions and impairments in aging and dementia (Savage and Gouvier, 1992). The test involves a free recall paradigm in which participants listen to a list of 15 nouns (list A) and are asked to recall aloud as many words as possible. Following 5 repetitions of word recall (A1 to A5), a new list (B) is introduced for “interference” with words presented in the list A. Participants then are asked to recall the words from list A (immediate recall, A6) and 20-mins later asked again to recall as many words as possible (delayed recall, A7). Performance scores were calculated based on the number of words recalled. Other performance metrics were calculated as following: learning rate (learning slope [LS] = [A5–A1]/4); susceptibility to interference (retrospective interference [RI] = A6/A5); forgetting rate ([A5–A7]/5). All the five variables were included as input features.