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Kam TE, Mannion DJ, Lee SW, et al. Human visual cortical responses to specular and matte motion flows. Front Hum Neurosci. 2015;9:579doi: 10.3389/fnhum.2015.00579.
Kam, T. E., Mannion, D. J., Lee, S. W., Doerschner, K., & Kersten, D. J. (2015). Human visual cortical responses to specular and matte motion flows. Frontiers in human neuroscience, 9579. https://doi.org/10.3389/fnhum.2015.00579
Kam, Tae-Eui, et al. "Human visual cortical responses to specular and matte motion flows." Frontiers in human neuroscience vol. 9 (2015): 579. doi: https://doi.org/10.3389/fnhum.2015.00579
Kam TE, Mannion DJ, Lee SW, Doerschner K, Kersten DJ. Human visual cortical responses to specular and matte motion flows. Front Hum Neurosci. 2015 Oct 21;9:579. doi: 10.3389/fnhum.2015.00579. eCollection 2015. PMID: 26539100; PMCID: PMC4612507.
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Front Hum Neurosci. 2015 Oct 21;9:579. doi: 10.3389/fnhum.2015.00579. eCollection 2015.

Human visual cortical responses to specular and matte motion flows.

Frontiers in human neuroscience

Tae-Eui Kam, Damien J Mannion, Seong-Whan Lee, Katja Doerschner, Daniel J Kersten

Affiliations

  1. Department of Computer Science and Engineering, Korea University Seoul, South Korea.
  2. Department of Brain and Cognitive Engineering, Korea University Seoul, South Korea ; School of Psychology, UNSW Australia Sydney, NSW, Australia ; Department of Psychology, University of Minnesota Minneapolis, MN, USA.
  3. Department of Computer Science and Engineering, Korea University Seoul, South Korea ; Department of Brain and Cognitive Engineering, Korea University Seoul, South Korea.
  4. Department of Psychology, Bilkent University Ankara, Turkey ; National Magnetic Resonance Research Center, Bilkent University Ankara, Turkey ; Department of Psychology, Justus-Liebig-University Giessen Giessen, Germany.
  5. Department of Brain and Cognitive Engineering, Korea University Seoul, South Korea ; Department of Psychology, University of Minnesota Minneapolis, MN, USA.

PMID: 26539100 PMCID: PMC4612507 DOI: 10.3389/fnhum.2015.00579

Abstract

Determining the compositional properties of surfaces in the environment is an important visual capacity. One such property is specular reflectance, which encompasses the range from matte to shiny surfaces. Visual estimation of specular reflectance can be informed by characteristic motion profiles; a surface with a specular reflectance that is difficult to determine while static can be confidently disambiguated when set in motion. Here, we used fMRI to trace the sensitivity of human visual cortex to such motion cues, both with and without photometric cues to specular reflectance. Participants viewed rotating blob-like objects that were rendered as images (photometric) or dots (kinematic) with either matte-consistent or shiny-consistent specular reflectance profiles. We were unable to identify any areas in low and mid-level human visual cortex that responded preferentially to surface specular reflectance from motion. However, univariate and multivariate analyses identified several visual areas; V1, V2, V3, V3A/B, and hMT+, capable of differentiating shiny from matte surface flows. These results indicate that the machinery for extracting kinematic cues is present in human visual cortex, but the areas involved in integrating such information with the photometric cues necessary for surface specular reflectance remain unclear.

Keywords: classification; functional magnetic resonance imaging (fMRI); motion flow; surface materials; visual perception

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