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Abstract
According to some authors, episodic memory impairment may be a feature shared by all schizophrenic patients, whereas others argue in favor of the mnesic heterogeneity. Our aims were to determine whether patients can be grouped based on according to their mnesic performances. The California Verbal Learning Test (CVLT), an episodic verbal learning test, was compared in 61 schizophrenic patients and 61 matched healthy subjects. The 32 indices were calculated using CVLT Scoring Software. This process allowed us to describe patients’ episodic processes in detail (encoding, storage, retrieval). We isolated one group with normative data, another showed impairment of both encoding and retrieval processes, and in the last one, only encoding process was impaired. As schizophrenia is heterogeneous with regard to episodic memory, impairments should not be considered as a common core to the various forms of the illness and it would be fruitful to systematically assess episodic processes in detail to take into account individual abilities and challenges.
Highlights
Long-term episodic memory underlies the encoding, storage, and retrieval of personal memories and is acquired in a specific spatio-temporal context
They have identified two more mnesic profiles. They showed that the prevailing symptoms, the severity of the disorder, sex, age, age of onset, and duration of illness and treatment varied between groups of schizophrenia patients who were classified according to their memory profiles, emphasizing that episodic memory performances could be heterogeneous in schizophrenia patients
Using the California Verbal Learning Test (CVLT, [20]), a word list learning task widely used to investigate functional mechanisms of episodic memory, we showed different episodic memory performances depending on the schizophrenia subtypes
Summary
Long-term episodic memory underlies the encoding, storage, and retrieval of personal memories and is acquired in a specific spatio-temporal context. In schizophrenia, this prominent cognitive function is considered to be impaired and to constitute a hallmark feature of the illness [1,2,3,4]. Authors have showed that some patients can be considered to have a normal memory profile according to their performance on encoding and retrieval tests [12,13] They have identified two more mnesic profiles. They showed that the prevailing symptoms, the severity of the disorder, sex, age, age of onset, and duration of illness and treatment varied between groups of schizophrenia patients who were classified according to their memory profiles, emphasizing that episodic memory performances could be heterogeneous in schizophrenia patients
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