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The Neural Mechanisms of Speech Comprehension: fMRI studies of Semantic Ambiguity
| CBU number: | 6127 |
| Authors: | Rodd, J.M., DAVIS, M.H., JOHNSRUDE, I.S. |
| Reference: | Cerebral Cortex, 15(8), 1261-1269 |
| Year of publication: | 2005 |
| Abstract text: | A number of regions of the temporal and frontal lobes are known to be important for spoken language comprehension, yet we do not have a clear understanding of their functional role(s). In particular, there is considerable disagreement about which brain regions are involved in the semantic aspects of comprehension. Two functional magnetic resonance studies use the phenomenon of semantic ambiguity to identify regions within the fronto-temporal language network that subserve the semantic aspects of spoken language comprehension. Volunteers heard sentences containing ambiguous words (e.g. ëthe shell was fired towards the tankí) and well-matched low-ambiguity sentences (e.g. ëher secrets were written in her diaryí). Although these sentences have similar acoustic, phonological, syntactic and prosodic properties (and were rated as being equally natural), the high-ambiguity sentences require additional processing by those brain regions involved in activating and selecting contextually appropriate word meanings. The ambiguity in these sentences goes largely unnoticed, and yet high-ambiguity sentences produced increased signal in left posterior inferior temporal cortex and inferior frontal gyri bilaterally. Given the ubiquity of semantic ambiguity, we conclude that these brain regions form an important part of the network that is involved in computing the meaning of spoken sentences. |
| First CBU author: | Davis, M.H. |
| Annual report number: | CBUAR 50 |
| Keywords: | frontal cortex, semantics, sentences, spoken language, temporal lobe, CBUImaging |