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Mechanisms underlying perseveration in aphasia: evidence from a single case study
Stephen J Gotts1, Antonio Incisa della Rocchetta, Lisa Cipolotti
1Department of Psychology-Baker Hall, Carnegie Mellon University & Center for the Neural Basis of Cognition, Pittsburgh, PA 15213, USA. gotts@cnbc.cmu.edu
Neuropsychologia
|September 5, 2002
Summary
Aphasic patients
Area of Science:
- Neuroscience
- Psycholinguistics
- Cognitive Psychology
Background:
- Recurrent perseverations are involuntary repetitions common in aphasia.
- Understanding factors influencing these errors is crucial for aphasia rehabilitation.
Observation:
- Aphasic patient E.B. showed increased perseverations with low-frequency picture names and repeated stimuli.
- Semantic relatedness and presentation rate did not significantly affect perseveration frequency.
Findings:
- Existing priming theories partially explain perseverations but not sequential proximity or trial effects.
- Perseverations decreased over time, independent of stimulus presentation rate.
Implications:
- Neuromodulatory deficits may underlie perseverative behavior in aphasia.
- Hasselmo's neuromodulation theory accounts for all observed perseverative patterns in patient E.B.