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  The neural basis of the bilateral distribution advantage

Pollmann, S., Zaidel, E., & von Cramon, D. Y. (2003). The neural basis of the bilateral distribution advantage. Experimental Brain Research, 153(3), 322-333. doi:10.1007/s00221-003-1551-0.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0010-E220-B Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002C-66F8-6
Genre: Journal Article

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 Creators:
Pollmann, Stefan1, Author              
Zaidel, E., Author
von Cramon, D. Yves2, Author              
Affiliations:
1External Organizations, ou_persistent22              
2MPI of Cognitive Neuroscience (Leipzig, -2003), The Prior Institutes, MPI for Human Cognitive and Brain Sciences, Max Planck Society, ou_634574              

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Free keywords: Bilateral distribution advantage; fMRI; Visual; Human
 Abstract: Letters can be matched by their physical identity (i.e., a–a: same/A–a: different) or by their name (both a–a and A–a: same). The latter, more demanding task has in previous experiments led to an advantage of bilateral over within-hemifield matches, which was not observed in the former. We have investigated the neural basis of this bilateral distribution advantage (BDA) in letter name matching with event-related fMRI. Unilateral, compared to bilateral, name matching led to increased activation in the contralateral fusiform and lateral occipital gyri. This increase went along with an ipsilateral increase of activation in homologous areas. Such a hemispheric resource sharing was not observed for letter shape matching. This pattern of activation shows that letter name matching induces hemispheric resource sharing in visual areas, which occurs when task demands in the hemisphere of input reach a critical level. Activation in anterior cingulate complex and posterior cingulate/retrosplenial cortex showed a task × visual field interaction with lower activation for bilateral than unilateral name matches but higher activation for bilateral than unilateral shape matches, which fits the interhemispheric transfer demands in these tasks.

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Language(s): eng - English
 Dates: 2003
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: -
 Identifiers: eDoc: 239443
Other: P6896
DOI: 10.1007/s00221-003-1551-0
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Title: Experimental Brain Research
  Other : Exp. Brain Res.
Source Genre: Journal
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Publ. Info: Heidelberg : Springer-Verlag
Pages: - Volume / Issue: 153 (3) Sequence Number: - Start / End Page: 322 - 333 Identifier: ISSN: 0014-4819
CoNE: https://pure.mpg.de/cone/journals/resource/954925398496