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Perseveration in two aphasic patients

C Papagno1, A Basso

  • 1Neurological Clinic, San Paolo Hospital.

Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
|March 1, 1996
PubMed
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This study examines perseverative behavior in aphasic patients, finding it

Area of Science:

  • Neurolinguistics
  • Cognitive Psychology
  • Clinical Aphasiology

Background:

  • Perseveration is a common symptom in aphasia, often characterized by the repetition of a previous response.
  • Existing literature suggests specific conditions under which perseveration occurs, such as semantic relatedness or correct response status.

Purpose of the Study:

  • To investigate the characteristics of perseverative behavior in two individuals with aphasia (AB and MT).
  • To challenge and refine existing theories on the mechanisms underlying perseveration in aphasia.

Main Methods:

  • Standardized Language Examination administered to patients AB and MT.
  • Design and implementation of specific verbal and nonverbal tasks to elicit perseveration.
  • Detailed analysis of response patterns, including timing and semantic content of perseverations.

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Main Results:

  • Key features of perseveration described in the literature were not consistently observed.
  • Perseveration was not semantically linked to the target response.
  • Perseveration could occur spontaneously, irrespective of previous correct responses, and was not inhibited by them.
  • Patient AB exhibited perseveration when unable to retrieve the correct response, while patient MT persevered despite knowing the correct response.

Conclusions:

  • The findings suggest that perseveration in aphasia may not be solely driven by semantic factors or response inhibition.
  • The distinct patterns in AB and MT indicate varied underlying mechanisms for perseveration.
  • A lack of an effective inhibitory system for pre-existing behaviors appears common in both patients.