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Related Experiment Video

Updated: Jul 9, 2026

Examining the Characteristics of Episodic Memory using Event-related Potentials in Patients with Alzheimer's Disease

Examining the Characteristics of Episodic Memory using Event-related Potentials in Patients with Alzheimer's Disease

Published on: August 30, 2011

Perseveration in Alzheimer's disease.

S Pekkala¹, M L Albert, A Spiro

¹Department of Speech Sciences, University of Helsinki, Helsinki, Finland. seija.pekkala@helsinki.fi

Dementia and Geriatric Cognitive Disorders

|December 14, 2007

Summary

Perseveration, a common Alzheimer's disease (AD) symptom, increases with cognitive decline. Different types of perseveration emerge and worsen as Alzheimer's disease (AD) progresses, indicating brain region deterioration.

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Examining the Characteristics of Episodic Memory using Event-related Potentials in Patients with Alzheimer's Disease

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Signal Attenuation as a Rat Model of Obsessive Compulsive Disorder

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Area of Science:

Neuroscience
Cognitive Psychology
Neurology

Background:

Perseveration is a frequent cognitive symptom observed in Alzheimer's disease (AD).
Understanding the progression of perseverative behaviors is crucial for diagnosing and managing AD.
The study investigates how perseveration changes across different stages of cognitive decline.

Purpose of the Study:

To document the types and quantitative burden of perseveration.
To track the progression of perseveration from normal aging to mild and moderate Alzheimer's disease (AD).
To identify specific perseverative patterns associated with distinct stages of AD.

Main Methods:

A semantic verbal fluency task was administered to participants.
Participants included individuals with normal cognition (n=30), mild AD (n=20), and moderate AD (n=20).
Quantitative analysis of perseverative errors was performed.

Main Results:

Perseveration significantly increased with the severity of Alzheimer's disease (AD).
Distinct types of perseveration statistically differentiated the study groups.
Recurrent and continuous perseverations were observed early in AD, increasing with disease severity.
Stuck-in-set perseverations emerged in the moderate AD stage.

Conclusions:

The observed types of perseveration likely reflect progressive deterioration in specific brain regions affected by Alzheimer's disease (AD).
Perseverative patterns can serve as indicators of neuropathological changes in AD progression.
Further research can explore the neural correlates of different perseveration types in AD.