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Utilizing Repetitive Transcranial Magnetic Stimulation to Improve Language Function in Stroke Patients with Chronic Non-fluent Aphasia
Published on: July 2, 2013
[Case report--Crossed aphasia]
Sigrídur Magnúsdóttir1, Ester Sighvatsdóttir
1Talmeinathjónustu, Landspítala Grensási, 108 Reykjavík. siggatal@lsh.is
Abstract:
A case study of crossed aphasia is presented. A 60-year-old right-handed individual suffered stroke in the right hemisphere leaving him with Broca's aphasia and severe verbal apraxia. A CT scan 3 days after hospitalization showed a new frontotemporal infarct in the right hemisphere, insula and frontal portion of the superior and middle temporal gyrus. MRI 2 weeks later showed more diverse changes involving the parietal lobe. In addition to the Broca's aphasia and verbal apraxia AA had prosodic difficulties involving intonation, stress and conversational vocal variations. Interesting phonological problems were also present, such as total loss of so-called preaspiration, a characteristic of the Icelandic phonological system. In 70% of crossed aphasia cases the symptoms are similar to those of aphasia in the left hemisphere but AA clearly does not fall into that group.
Insights
This case study details crossed aphasia in a right-handed individual, highlighting unusual phonological and prosodic deficits beyond typical Broca's aphasia symptoms. The findings challenge the conventional understanding of crossed aphasia presentation.
Area of Science:
- Neuroscience
- Neurolinguistics
- Clinical Neurology
Background:
- Crossed aphasia, rare in right-handed individuals, typically presents with left-hemisphere-like aphasic symptoms.
- Understanding the neurological underpinnings of language processing in atypical brain lateralization is crucial.
Observation:
- A 60-year-old right-handed male presented with Broca's aphasia and verbal apraxia following a right-hemisphere stroke.
- Neuroimaging revealed a frontotemporal infarct affecting the right insula and temporal gyri, with subsequent parietal lobe involvement.
- The patient exhibited significant prosodic difficulties (intonation, stress, vocal variation) and unique phonological deficits, including loss of preaspiration.
Findings:
- The patient's aphasia presentation deviated significantly from the typical pattern observed in 70% of crossed aphasia cases.
- The specific phonological deficit (loss of preaspiration) is characteristic of the Icelandic language, adding a unique dimension to the case.
- The combination of Broca's aphasia, verbal apraxia, prosodic issues, and specific phonological loss points to complex right-hemisphere language processing.
Implications:
- This case expands the known spectrum of crossed aphasia, demonstrating that right-hemisphere strokes can lead to diverse and atypical language impairments.
- It underscores the potential for right-hemisphere involvement in aspects of speech production, prosody, and phonology, even in right-handed individuals.
- Further research into right-hemisphere language functions and their disruption in crossed aphasia is warranted, particularly concerning phonological processing.
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