title: Gradual Development of Visual Texture-Selective Properties Between Macaque Areas V2 and V4.
abstract: Complex shape and texture representations are known to be constructed from V1 along the ventral visual pathway through areas V2 and V4, but the underlying mechanism remains elusive. Recent study suggests that, for processing of textures, a collection of higher-order image statistics computed by combining V1-like filter responses serves as possible representations of textures both in V2 and V4. Here, to gain a clue for how these image statistics are processed in the extrastriate visual areas, we compared neuronal responses to textures in V2 and V4 of macaque monkeys. For individual neurons, we adaptively explored their preferred textures from among thousands of naturalistic textures and fitted the obtained responses using a combination of V1-like filter responses and higher-order statistics. We found that, while the selectivity for image statistics was largely comparable between V2 and V4, V4 showed slightly stronger sensitivity to the higher-order statistics than V2. Consistent with that finding, V4 responses were reduced to a greater extent than V2 responses when the monkeys were shown spectrally matched noise images that lacked higher-order statistics. We therefore suggest that there is a gradual development in representation of higher-order features along the ventral visual hierarchy.
authors.affiliation: Division of Sensory and Cognitive Information, National Institute for Physiological Sciences, Aichi 444-8585, Japan.|Department of Physiological Sciences, The Graduate University for Advanced Studies (SOKENDAI), Aichi 444-8585, Japan.|Center for Neural Science, New York University, New York, NY 10003, USA.|Center for Neural Science, New York University, 4 Washington Place, New York, NY 10003, USA.
authors.forename: Gouki
authors.initials: G
authors.lastname: Okazawa
authors.affiliation: Department of Basic Neuroscience, University of Geneva, Geneva 1211, Switzerland.
authors.forename: Satohiro
authors.initials: S
authors.lastname: Tajima
authors.affiliation: Division of Sensory and Cognitive Information, National Institute for Physiological Sciences, Aichi 444-8585, Japan.|Department of Physiological Sciences, The Graduate University for Advanced Studies (SOKENDAI), Aichi 444-8585, Japan.
authors.forename: Hidehiko
authors.initials: H
authors.lastname: Komatsu
mesh_terms: D000818:Animals; D005260:Female; D008253:Macaca mulatta; D023421:Models, Animal; D009474:Neurons / Q000502:physiology*; D010775:Photic Stimulation / Q000379:methods; D014793:Visual Cortex / Q000502:physiology*; D014795:Visual Pathways / Q000502:physiology*; D014796:Visual Perception / Q000502:physiology*
keywords: image statistics; macaque; material perception; texture perception; ventral visual pathway