Experimental Brain Research

, Volume 202, Issue 3, pp 669–679 | Cite as

Differential human brain activation by vertical and horizontal global visual textures

  • Jane E. Aspell
  • John Wattam-Bell
  • Janette Atkinson
  • Oliver J. Braddick
Research Article

Abstract

Mid-level visual processes which integrate local orientation information for the detection of global structure can be investigated using global form stimuli of varying complexity. Several lines of evidence suggest that the identification of concentric and parallel organisations relies on different underlying neural substrates. The current study measured brain activation by concentric, horizontal parallel, and vertical parallel arrays of short line segments, compared to arrays of randomly oriented segments. Six subjects were scanned in a blocked design functional magnetic resonance imaging experiment. We compared percentage BOLD signal change during the concentric, horizontal and vertical blocks within early retinotopic areas, the fusiform face area and the lateral occipital complex. Unexpectedly, we found that vertical and horizontal parallel forms differentially activated visual cortical areas beyond V1, but in general, activations to concentric and parallel forms did not differ. Vertical patterns produced the highest percentage signal change overall and only area V3A showed a significant difference between concentric and parallel (horizontal) stimuli, with the former better activating this area. These data suggest that the difference in brain activation to vertical and horizontal forms arises at intermediate or global levels of visual representation since the differential activity was found in mid-level retinotopic areas V2 and V3 but not in V1. This may explain why earlier studies—using methods that emphasised responses to local orientation—did not discover this vertical–horizontal anisotropy.

Keywords

Global processing Form vision Form coherence Orientation anisotropy fMRI 

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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Jane E. Aspell
    • 1
    • 3
  • John Wattam-Bell
    • 2
  • Janette Atkinson
    • 2
  • Oliver J. Braddick
    • 1
  1. 1.Department of Experimental PsychologyUniversity of OxfordOxfordUK
  2. 2.Department of PsychologyUniversity College LondonLondonUK
  3. 3.Brain-Mind InstituteEcole Polytechnique Fédérale de LausanneLausanneSwitzerland

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