Right-hemisphere interactions in picture-word processing

Underwood, Geoffrey; Whitfield, Alison

doi:10.1016/0278-2626(85)90021-1

Cited by 19 publications

(4 citation statements)

References 20 publications

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“…The additional right thalamic activation may be related to the presence of picture stimuli, as a previous object activation task using only word stimuli did not show its involvement. This is consistent with studies showing left hemisphere processing for word stimuli and additional right hemisphere involvement for picture-word stimuli [6]. The motor system activation was attributed to a more robust activation of other semantic memory systems, in this case somatomotor, when stimuli from multiple domains (picture and word modality of vision) are used to activate the semantic memory circuit.…”

Section: Neural Hybrid Model Of Semantic Memorysupporting

confidence: 79%

Neural mechanisms of semantic memory

Kraut¹,

Pitcock²,

Hart

2004

Curr Neurol Neurosci Rep

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Using previously published functional magnetic resonance imaging work studying object recall as a framework, we describe the spatial and temporal properties of brain activation as one plausible model of visually triggered access to semantic memory. We suggest that interactions between the dorsomedial thalamus and Brodmann area 6 facilitate the setting of object search criteria and perhaps drive the search. The pulvinar nucleus of the thalamus, in concert with ventral temporal and occipital cortical regions, become active later, perhaps when the criteria are met or the target object is identified.

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Section: Neural Hybrid Model Of Semantic Memorysupporting

confidence: 79%

Neural mechanisms of semantic memory

Kraut¹,

Pitcock²,

Hart

2004

Curr Neurol Neurosci Rep

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“…The f MRI signal changes detected during both trials that resulted in object recall and some that did not were located in bilateral Brodmann area 6 and the ventral temporo-occipital cortices. For these multimodal stimuli, the thalamic activation was bilateral, which has been reported when picture and word stimuli are processed (Underwood & Whitfield, 1985). In only those trials that resulted in object recall, there were significant signal changes in the thalamus (Kraut et al, 2002a).…”

Section: Introductionmentioning

confidence: 52%

Neural hybrid model of semantic object memory: Implications from event-related timing using fMRI

Kraut

Calhoun

Pitcock

et al. 2003

J Int Neuropsychol Soc

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Previous studies by our group have demonstrated fMRI signal changes and synchronized gamma rhythm EEG oscillations between thalamus and cortical regions as subjects recall objects from visually presented features. Here, we extend this work by estimating the time course of fMRI signal changes in the cortical and subcortical regions found to exhibit evidence for task-related activation. Our results indicate that there are separate loci of signal changes in the thalamus (dorsomedial and pulvinar) that exhibit notable differences in times of onset, peak and return to baseline of signal changes. The signal changes in the pulvinar demonstrate the slowest transients of all the cortical and subcortical regions we examined. Evaluation of cortical regions demonstrated salient differences as well, with the signal changes in Brodmann area 6 (BA6) rising, peaking, and returning to baseline earlier than those detected in other regions. We conclude that BA6 mediates early designation or refinement of search criteria, and that the pulvinar may be involved in the binding of feature stimuli for an integrated object memory.

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“…A verbal response of any kind is clearly unacceptable in view of the potential confounding arising from the dominance of left hemisphere speech mechanisms (c.f. Underwood & Whitfield, 1985). In the present study, it was decided to employ a lexical decision task and to use a GO/NOGO procedure which required subjects to use a bimanual response to signal GO (target = word) decisions.…”

Section: Methodsmentioning

confidence: 99%

Homotopic callosal inhibition in hemispheric priming: A test of cook’s topographical inhibitory model

Coney

2002

Curr Psychol

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This study set out to evaluate Cook's (1986) topographical inhibitory model of language processing in the hemispheres. The model employs the neurophysiological mechanism of homotopic callosal inhibition to explain recent findings which suggest that the left hemisphere processes denotative meaning, while the right hemisphere specializes in connotative meaning. Specific predictions in relation to lateralized priming phenomena were derived from the model. The first experiment tested the prediction that word repetition and denotative priming would facilitate responses to right visual field targets, while connotative priming would favour the left visual field. None of these predictions were confirmed. A second experiment modified in a number of ways, provided a more extensive test of the predictions but produced essentially the same result. It was concluded that no evidence could be obtained to support the topographical inhibitory model. Instead, the results extend previous findings by suggesting that associative priming has more or less equivalent effects in each hemisphere, provided the interval between prime and target is sufficiently long.T he present study set out to test the validity of the topographical inhibitory model proposed by Cook (1986) to explain recent findings concerning the contribution of the right hemisphere to language. The model develops the notion of homotopic callosal inhibition to account for differential specialisation of the hemispheres for detail and context in language processing.It is generally accepted that, in the great majority of individuals, the left hemisphere assumes the dominant role in language function. This view arose in the first instance from neurological observations beginning in the previous century (Broca, 1861; Dax, 1865), and subsequently received considerable support from split-brain research (Gazzaniga, 1970). The consensus of opinion concerning fight hemisphere function has been that this hemisphere has superior capabilities in certain aspects of visuospatial processing, among other things, but plays a relatively unimportant and clearly subsidiary role in the production and comprehension of language.Over the last two decades, however, some evidence has emerged which suggests that the language functions of the right hemisphere may have been significantly underestimated. A number of investigators have looked more carefully at the characteristics of preserved language capability in the presence of fight hemisphere damage. These investigators have sought to use more subtle behavioral tests than the relatively crude methods traditionally used to assess language in neurological cases, with results that

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Right-hemisphere interactions in picture-word processing

Cited by 19 publications

References 20 publications

Neural mechanisms of semantic memory

Neural mechanisms of semantic memory

Neural hybrid model of semantic object memory: Implications from event-related timing using fMRI

Homotopic callosal inhibition in hemispheric priming: A test of cook’s topographical inhibitory model

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