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Conceptual proposition selection and the LIFG: neuropsychological evidence from a focal frontal group
- Source :
- Neuropsychologia. 48(6)
- Publication Year :
- 2009
-
Abstract
- Much debate surrounds the role of the left inferior frontal gyrus (LIFG). Evidence from lesion and neuroimaging studies suggests the LIFG supports a selection mechanism used in single word generation. Single case studies of dynamic aphasic patients with LIFG damage concur with this and extend the finding to selection of sentences at the conceptual preparation stage of language generation. A neuropsychological group with unselected focal frontal and non-frontal lesions is assessed on a sentence generation task that varied the number of possible conceptual propositions available for selection. Frontal patients with LIFG damage when compared to Frontal patients without LIFG damage and Posterior patients were selectively impaired on sentence generation tests onlywhenstimuli activated multiple conceptual propositions that compete with each other for selection. We found that this selective impairment is critical for reduced speech rate, the core deficit of dynamic aphasia, and we would argue it is causative for one form of dynamic aphasia associated with LIFG lesions. These results provide evidence that the LIFG is crucial for selecting among multiple competing conceptual propositions for language generation. Crown Copyright © 2010 Published by Elsevier Ltd. All rights reserved.
- Subjects :
- Adult
Male
Speech production
Cognitive Neuroscience
Concept Formation
Decision Making
Prefrontal Cortex
Experimental and Cognitive Psychology
Proposition
Neuropsychological Tests
Functional Laterality
Statistics, Nonparametric
conceptual proposition selection
Behavioral Neuroscience
Executive Function
Neuroimaging
Aphasia
medicine
Selection (linguistics)
Humans
Prefrontal cortex
Neurologic Examination
Language Disorders
Language Tests
Mechanism (biology)
Neuropsychology
Middle Aged
Magnetic Resonance Imaging
Semantics
Pattern Recognition, Visual
Brain Injuries
Female
medicine.symptom
Psychology
Cognition Disorders
Photic Stimulation
Cognitive psychology
Subjects
Details
- ISSN :
- 18733514
- Volume :
- 48
- Issue :
- 6
- Database :
- OpenAIRE
- Journal :
- Neuropsychologia
- Accession number :
- edsair.doi.dedup.....dca168c0c7a5600e30daf4f54828bc0f