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Orientation-selective adaptation to first- and second-order patterns in human visual cortex.

Jonas Larsson1, Michael S Landy, David J Heeger

  • 1Department of Psychology and Center for Neural Science, New York University, New York, NY 10003, USA. jonas@cns.nyu.edu

Journal of Neurophysiology
|October 14, 2005
PubMed
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Neural mechanisms for second-order visual textures remain unclear. This study used fMRI to show that orientation-selective adaptation to these textures, unlike first-order luminance-based ones, is processed in higher visual areas beyond V1.

Area of Science:

  • Neuroscience
  • Visual Perception
  • Cognitive Science

Background:

  • Second-order textures, which lack luminance contrast, are common in visual scenes.
  • Understanding the neural basis of second-order texture perception is crucial for visual neuroscience.

Purpose of the Study:

  • To investigate the neural mechanisms underlying the perception of second-order texture orientation.
  • To determine if second-order texture processing originates in early visual areas or involves higher-level cortical regions.

Main Methods:

  • Used functional magnetic resonance imaging (fMRI) with an adaptation protocol.
  • Measured orientation-selective neural adaptation to first-order (luminance-modulated) and second-order (contrast- or orientation-modulated) gratings.
  • Examined responses in multiple human visual cortical areas, including V1, V2, V3, V3A/B, LO1, hV4, and VO1.

Related Experiment Videos

Main Results:

  • Both first- and second-order stimuli elicited orientation-selective adaptation across visual areas.
  • First-order adaptation was localized to V1, with no significant increase in extrastriate areas.
  • Second-order texture adaptation was significantly larger in extrastriate areas (VO1, V3A/B, LO1) than in V1, suggesting later processing.
  • Cross-modal adaptation between first- and second-order stimuli was minimal.

Conclusions:

  • Orientation selectivity for first-order textures is established in V1.
  • Second-order texture orientation is processed by mechanisms beyond V1, likely involving specialized areas like VO1.
  • Distinct neural pathways may exist for processing first- and second-order visual information.