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Spatial attention enhances object coding in local and distributed representations of the lateral occipital complex.(Report)

Guggenmos, Matthias ; Thoma, Volker ; Haynes, John-Dylan ; Richardson-Klavehn, Alan ; Cichy, Radoslaw Martin ; Sterzer, Philipp

Neuroimage, August 1, 2015, Vol.116, p.149 [Periódico revisado por pares]

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  • Título:
    Spatial attention enhances object coding in local and distributed representations of the lateral occipital complex.(Report)
  • Autor: Guggenmos, Matthias ; Thoma, Volker ; Haynes, John-Dylan ; Richardson-Klavehn, Alan ; Cichy, Radoslaw Martin ; Sterzer, Philipp
  • Assuntos: Visual Perception ; Computer Science ; Neurosciences
  • É parte de: Neuroimage, August 1, 2015, Vol.116, p.149
  • Descrição: To access, purchase, authenticate, or subscribe to the full-text of this article, please visit this link: http://dx.doi.org/10.1016/j.neuroimage.2015.04.004 Byline: Matthias Guggenmos [matthias.guggenmos@bccn-berlin.de] (a,b,*), Volker Thoma (c), John-Dylan Haynes (a), Alan Richardson-Klavehn (d), Radoslaw Martin Cichy (e,1), Philipp Sterzer (a,b,1) Keywords Attention; Objects; Lateral occipital complex; Multivariate pattern analysis; Mutual information; fMRI Highlights * Attentional modulation of voxel-level activity increases with object tuning. * Attention increases mutual information between voxel responses and object identity. * Attention increases information content and reproducibility of activation patterns. * Pattern effects linked to local increase of mutual information but not neural gain. Abstract The modulation of neural activity in visual cortex is thought to be a key mechanism of visual attention. The investigation of attentional modulation in high-level visual areas, however, is hampered by the lack of clear tuning or contrast response functions. In the present functional magnetic resonance imaging study we therefore systematically assessed how small voxel-wise biases in object preference across hundreds of voxels in the lateral occipital complex were affected when attention was directed to objects. We found that the strength of attentional modulation depended on a voxel's object preference in the absence of attention, a pattern indicative of an amplificatory mechanism. Our results show that such attentional modulation effectively increased the mutual information between voxel responses and object identity. Further, these local modulatory effects led to improved information-based object readout at the level of multi-voxel activation patterns and to an increased reproducibility of these patterns across repeated presentations. We conclude that attentional modulation enhances object coding in local and distributed object representations of the lateral occipital complex. Author Affiliation: (a) Bernstein Center for Computational Neuroscience, Berlin, Germany (b) Visual Perception Laboratory, CharitAaAaAeA@ UniversitAaAaAeAntsmedizin, Ber Germany (c) School of Psychology, University of East London, London, UK (d) Department of Neurology, Otto von Guericke University, Magdeburg, Germany (e) Computer Science and Artificial Intelligence Laboratory, Massachusetts Institute of Technology, Cambridge, USA * Corresponding author at: Bernstein Center for Computational Neuroscience, Philippstra[sz]e 13, Haus 6, 10115 Berlin, Germany. Article History: Received 30 December 2014; Accepted 1 April 2015 (footnote)1 Contributed equally.
  • Idioma: Inglês

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