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Confabulation and memory in patients with Alzheimer's disease
1Departments of Logopedics and Phoniatrics, Karolinska Institutet, Stockholm, Sweden. ing-mari.tallberg@klinvet.ki.se
Journal of Clinical and Experimental Neuropsychology
|April 20, 2001
Summary
Alzheimer's disease patients confabulate by substituting recent memories with remote ones. This confabulation is linked to poorer overall cognitive function, not specific memory recall issues.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Neurology
Background:
- Confabulation is a common symptom in various brain diseases, often accompanying cognitive impairments.
- Understanding the semantic characteristics of confabulation is crucial for diagnosing and managing cognitive disorders.
Purpose of the Study:
- To describe the semantic features of confabulation in Alzheimer's disease (AD).
- To investigate the relationship between these semantic features and memory functions in AD patients.
Main Methods:
- 15 Alzheimer's disease patients were prompted to confabulate.
- Confabulations were analyzed for semantic remoteness from target answers.
- Cognitive tests assessed episodic memory, semantic memory, priming, and global cognitive function.
Main Results:
- Semantic remoteness in confabulations correlated positively with lower Mini Mental State Examination scores.
- No significant relationship was found between semantic remoteness and item recall, word fluency, or priming.
- Findings suggest confabulation in AD may stem from retrieval difficulties of recent autobiographical memories.
Conclusions:
- Confabulation in Alzheimer's disease is characterized by semantic remoteness.
- This phenomenon is associated with generalized cognitive decline rather than specific memory deficits.
- Primary dysdiacetic confabulation, involving substitution with remote memories, appears prevalent in AD.