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The effect of prior visual information on recognition of speech and sounds
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In: CEREB CORTEX , 18 (3) 598 - 609. (2008) (2008)
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Language control in the bilingual brain
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In: SCIENCE , 312 (5779) 1537 - 1540. (2006) (2006)
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Two distinct neural mechanisms for category-selective responses
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In: CEREB CORTEX , 16 (3) 437 - 445. (2006) (2006)
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Abstract:
The cognitive and neural mechanisms mediating category-selective responses in the human brain remain controversial. Using functional magnetic resonance imaging and effective connectivity analyses (Dynamic Causal Modelling), we investigated animal- and tool-selective responses by manipulating stimulus modality (pictures versus words) and task (implicit versus explicit semantic). We dissociated two distinct mechanisms that engender category selectivity: in the ventral occipito-temporal cortex, tool-selective responses were observed irrespective of task, greater for pictures and mediated by bottom-up effects. In a left temporo-parietal action system, tool-selective responses were observed irrespective of modality, greater for explicit semantic tasks and mediated by top-down modulation from the left prefrontal cortex. These distinct activation and connectivity patterns suggest that the two systems support different cognitive operations, with the ventral occipito-temporal regions engaged in structural processing and the dorsal visuo-motor system in strategic semantic processing. Consistent with current semantic theories, explicit semantic processing of tools might thus rely on reactivating their associated action representations via top-down modulation. In terms of neuronal mechanisms, the category selectivity may be mediated by distinct top-down (task-dependent) and bottom-up (stimulus-dependent) mechanisms.
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Keyword:
BRAIN; category selectivity; CONCEPTUAL KNOWLEDGE; CONNECTIVITY; CORTEX; dynamic causal modelling; effective connectivity; functional imaging; GRASP REPRESENTATIONS; HUMANS; LEXICAL RETRIEVAL; MEMORY; OBJECTS; semantic memory; SYSTEMS
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URL: http://discovery.ucl.ac.uk/132647/
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Two approaches to repetition suppression.
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In: Hum Brain Mapp , 27 (5) pp. 411-416. (2006) (2006)
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Language control in the bilingual brain
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In: Science , 312 (5779) pp. 1537-1540. (2006) (2006)
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Language control in the bilingual brain
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In: Science , 312 (5779) pp. 1537-1540. (2006) (2006)
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How reading differs from object naming at the neuronal level
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In: NeuroImage , 29 (2) pp. 643-648. (2006) (2006)
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How reading differs from object naming at the neuronal level
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In: NEUROIMAGE , 29 (2) 643 - 648. (2006) (2006)
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Reading skills after left anterior temporal lobe resection: an fMRI study
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In: BRAIN , 128 1377 - 1385. (2005) (2005)
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Structural and functional aspects of L2 acquisition
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In: In: Green, DW and Meisel, JM, (eds.) (Proceedings) Colloquium on Neuroimaging studies of representation and processing in bilinguals. 5th International Symposium on Bilingualism, March 21st-23rd. (pp. pp. 61-63). : Barcelona. (2005) (2005)
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Degenerate neuronal systems sustaining cognitive functions
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In: JOURNAL OF ANATOMY , 205 (6) 433 - 442. (2004) (2004)
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Retrieval of abstract semantics
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In: NEUROIMAGE , 22 (1) 164 - 170. (2004) (2004)
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An fMRI study of syntactic adaptation
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In: J COGNITIVE NEUROSCI , 16 (4) 702 - 713. (2004) (2004)
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The neural areas that control the retrieval and selection of semantics.
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In: Neuropsychologia , 42 (9) pp. 1269-1280. (2004) (2004)
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Differentiating the neural activation pattern for German and English in highly proficient bilinguals
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In: In: (Proceedings) Conference of the Neuroscience Society, 18-20th April. : San Francisco. (2004) (2004)
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Structural plasticity in the bilingual brain - Proficiency in a second language and age at acquisition affect grey-matter density.
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In: NATURE , 431 (7010) 757 - 757. (2004) (2004)
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Normal and pathological reading: converging data from lesion and imaging studies
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In: NEUROIMAGE , 20 S30 - S41. (2003) (2003)
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