Related Experiment Videos
Speech timing subsequent to brain damage: effects of utterance length and complexity
1School of Communication Sciences and Disorders, McGill University, Montreal, Quebec, Canada. insr@musicb.mcgill.ca
Brain and Language
|April 7, 1999
Summary
Nonfluent aphasic patients exhibit impaired speech timing, specifically lacking normal phrase-final lengthening. This study analyzed syllable durations in brain-damaged patients and controls, revealing timing control deficits in aphasia.
Area of Science:
- Neuroscience
- Linguistics
- Speech-Language Pathology
Background:
- Focal brain damage can lead to deficits in speech timing control.
- Understanding these deficits is crucial for developing effective therapies for individuals with aphasia.
Purpose of the Study:
- To investigate hypotheses regarding speech timing control deficits after focal brain damage.
- To compare temporal patterns in nonfluent aphasics, fluent aphasics, right-hemisphere-damaged patients, and normal controls.
Main Methods:
- Acoustic analyses of syllable durations were performed.
- Participants produced monosyllabic root syllables in medial and final positions within varying sentence structures.
- Syllable durations were analyzed as a proportion of utterance length across different contexts and patient groups.
Main Results:
- Most subject groups displayed relatively normal temporal patterns.
- Nonfluent aphasic patients notably failed to exhibit normal phrase-final lengthening effects.
- This suggests a specific deficit in temporal control for this patient group.
Conclusions:
- Findings challenge some theories of temporal control in brain-damaged populations.
- Nonfluent aphasia is associated with specific impairments in speech timing, particularly phrase-final lengthening.
- Further research is needed to fully understand the implications for speech production theories.