Differential human brain activation by vertical and horizontal global visual textures.

Experimental Brain Research
Jane E AspellOliver J Braddick

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 di...Continue Reading

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Citations

Nov 17, 2010·PloS One·Jennifer B SwettenhamNgoc J Thai
Oct 15, 2013·The European Journal of Neuroscience·Yoshihito Shigihara, Semir Zeki
Oct 31, 2012·Brazilian Journal of Otorhinolaryngology·Theo Zeferino PavanAntonio Adilton Olivera Carneiro
Oct 8, 2011·NeuroImage·Jean-François Knebel, Micah M Murray
Jul 26, 2011·Brain Research·Charles AissaniJean Lorenceau
Sep 29, 2012·Vision Research·Jean-François NankooDouglas R Wylie

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