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Psychological verbs and the double-dependency hypothesis.

A Beretta1, C Campbell

  • 1Department of Linguistics, Michigan State University, USA.

Brain and Cognition
|August 31, 2001
PubMed
Summary
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Broca's aphasia patients comprehend sentences with one dependency but struggle with two, supporting the double-dependency hypothesis (DDH). This study confirms DDH predictions using psychological verbs in different passive constructions.

Area of Science:

  • Neuroscience
  • Linguistics
  • Psychology

Background:

  • The double-dependency hypothesis (DDH) proposes that Broca's aphasia comprehension is impaired with two linguistic dependencies but intact with one.
  • Psychological verbs present unique challenges due to their argument structures and potential for multiple dependencies.

Purpose of the Study:

  • To test the double-dependency hypothesis (DDH) in individuals with Broca's aphasia.
  • To examine how Broca's aphasia patients comprehend sentences involving psychological verbs with varying dependency structures.

Main Methods:

  • Assessed comprehension performance of Broca's aphasia patients on sentences featuring two classes of psychological verbs.
  • Compared performance on subject-Experiencer verbs (forming verbal passives with two dependencies) and object-Experiencer verbs (forming adjectival passives with one dependency).

Related Experiment Videos

Main Results:

  • Patients demonstrated intact comprehension of adjectival passive psychological verbs (one dependency), aligning with DDH predictions.
  • Patients performed at chance levels on verbal passive psychological verbs (two dependencies), also consistent with DDH predictions.
  • Results support the DDH and contradict previous findings by Grodzinsky (1995b).

Conclusions:

  • The findings strongly support the double-dependency hypothesis in explaining comprehension deficits in Broca's aphasia.
  • The study provides evidence for the DDH's validity, particularly concerning the processing of complex sentence structures with psychological verbs.