Related Experiment Videos
Preserved visual lexicosemantics in global aphasia: a right-hemisphere contribution?
1Cognitive Neurology and Alzheimer's Research Centre, St. Joseph's Health Care London, London, Ontario, Canada. bgold@lri.sjhc.london.ont.ca
Brain and Language
|December 9, 2000
Summary
Extensive testing of patient GP revealed that nonperisylvian areas can extract meaning from printed words, highlighting the right hemisphere's role in visual semantic processing.
Area of Science:
- Neuroscience
- Psycholinguistics
- Cognitive Neurology
Background:
- Investigating the capacity of non-perisylvian brain regions for visual lexicosemantic processing after severe left-hemisphere damage.
- Examining the functional roles of the left hemisphere (LH) and right hemisphere (RH) in language and meaning extraction from written text.
Observation:
- Patient GP, with extensive LH language region destruction, underwent comprehensive testing.
- The patient demonstrated preserved abilities in recognizing superordinate categories (e.g., animals, tools, furniture) and differentiating real words from nonwords and proper nouns.
- The patient could also distinguish between words for living and nonliving things.
Findings:
- The study suggests LH specificity for phonological and syntactic processing due to global impairment.
- Significant RH participation in visual lexicosemantic processing was observed.
- Preserved visual lexicosemantic abilities, despite severe phonological coding deficits, underscore the importance of the direct lexical route to word meaning.
Implications:
- Findings challenge traditional models by demonstrating RH's crucial role in semantic processing of written words.
- Highlights the brain's plasticity and compensatory mechanisms following focal brain injury.
- Provides insights into the neural underpinnings of reading and semantic access, particularly the direct visual route to meaning.