Neuroimaging of cognitive functions in human parietal cortex

Culham, Jody C.; Kanwisher, Nancy

doi:10.1016/s0959-4388(00)00191-4

Cited by 721 publications

(454 citation statements)

References 89 publications

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“…This kind of normalisation process is typical of the computations attributed to parietal cortex, a high order cortex that receives direct and indirect projections from all sensory regions, activated in many tasks that involve attention and coordinates transformation in both spatial and temporal domains (Culham and Kanwisher, 2001;Duhamel et al, 1992). Numerosity sensitive cell assemblies in monkeys and cats have been found by electrophysiological recordings from areas that are homologous to parietal regions (Nieder and Miller, 2004;Sawamura et al, 2002;Thompson et al, 1970).…”

Section: An A-modal Right Hemisphere Superiority For Approximate Numementioning

confidence: 89%

Exact and approximate judgements of visual and auditory numerosity: An fMRI study

Piazza

Mechelli

Price³

et al. 2006

Brain Research

199

161

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Human adults can assess the number of objects in a set (numerosity) by approximate estimation or by exact counting. There is evidence suggesting that numerosity estimation depends on a dedicated mechanism that is a-modal and non-verbal. By contrast, counting requires the coordination between the pre-existing numerosity estimation abilities with language and one-to-one correspondence principles. In this paper we investigate with fMRI the neural correlates of numerosity estimation and counting in human adults, using both visual and auditory stimuli. Results show that attending to approximate numerosity correlates with increased activity of a right lateralized fronto-parietal cortical network, and that this activity is independent of the stimuli presentation's modality. Counting activates additional left prefrontal, parietal, and bilateral premotor areas, again independently from stimulus modality. These results dissociate two neuronal systems that underlie different numerosity judgements. SECTION:Cognitive and Behavioural Neuroscience

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Section: An A-modal Right Hemisphere Superiority For Approximate Numementioning

confidence: 89%

Exact and approximate judgements of visual and auditory numerosity: An fMRI study

Piazza

Mechelli

Price³

et al. 2006

Brain Research

199

161

View full text Add to dashboard Cite

show abstract

“…The parietal cortex is classically thought of as an association area, taking inputs from multiple sensory areas and projecting to multiple higher cortical areas. Recent neuroimaging data have also revealed that the parietal cortex plays a role in memory and attention (41,42). It is also possible that dysfunction in the parietal cortex could explain many of the neurocognitive deficits seen in children treated for medulloblastoma.…”

Section: Discussionmentioning

confidence: 99%

Changes in Cerebral Cortex of Children Treated for Medulloblastoma

Liu

Marcus

Fischl

et al. 2007

International Journal of Radiation Oncology*Biology*Physics

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“…It is well established that the IPS plays an important role in a large variety of tasks with high attentional demands (Culham and Kanwisher, 2001). More recently, language-related tasks have also been reported to activate posterior parietal cortex (Gurd et al, 2002;Sohn et al, 2000).…”

Section: Discussionmentioning

confidence: 99%

Interactions of the hippocampal system and the prefrontal cortex in learning language-like rules

2003

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One of the most influential views on the hippocampal function suggests that this brain region is critically involved in relational memory processing, that is, binding converging inputs to mediate the representation of relationships among the constituents of episodes. It has been proposed that this binding is automatic and obligatory during learning and remembering In addition, neuroimaging studies have highlighted the importance of the prefrontal cortex, in learning, memory, and language processing. However, the posited importance of hippocampalprefrontal interaction remains to be empirically tested. In the present study we used functional magnetic resonance imaging to examine in detail this interaction by assessing learning-related changes in hemodynamic activity during artificial language acquisition. It has been shown previously that artificial grammar systems might be learned by evaluating pattern-based relations in word sequences and generalizing beyond specific word order, that is, rule abstraction. During scanning, participants learned an artificial language whose miniature grammar meets the universal principles of a natural language. Increased proficiency level of the artificial language is associated with decreased left hippocampal activity. In contrast, we observed an increased recruitment of the left inferior frontal gyrus (Broca's area), a region that contributes to syntax processing in natural language. The present results, therefore, indicate a learning-related change in brain circuitry underlying relational processes of language learning, with a transition from a similarity-based learning system in the medial temporal lobes to a language-related processing system in the left prefrontal cortex.

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Neuroimaging of cognitive functions in human parietal cortex

Cited by 721 publications

References 89 publications

Exact and approximate judgements of visual and auditory numerosity: An fMRI study

Exact and approximate judgements of visual and auditory numerosity: An fMRI study

Changes in Cerebral Cortex of Children Treated for Medulloblastoma

Interactions of the hippocampal system and the prefrontal cortex in learning language-like rules

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