Human visual cortical responses to specular and matte motion flows
Frontiers in Human Neuroscience
Frontiers Media S. A
Item Usage Stats
MetadataShow full item record
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. © 2015 Kam, Mannion, Lee, Doerschner and Kersten.
Functional magnetic resonance imaging (fMRI)
evoked cortical response
functional magnetic resonance imaging
secondary visual cortex
visual area V3
visual area V4
Published Version (Please cite this version)http://dx.doi.org/10.3389/fnhum.2015.00579
Showing items related by title, author, creator and subject.
Sevil, S. G.; Kucuktunc, O.; Duygulu, P.; Can, F. (Springer New York LLC, 2010)In this paper we present an automatic photo tag expansion method designed for photo sharing websites. The purpose of the method is to suggest tags that are relevant to the visual content of a given photo at upload time. ...
Okuyan, Erhan (Bilkent University, 2014)Direct volume rendering is widely used in many applications where the inside of a transparent or a partially transparent material should be visualized. We have explored several aspects of the problem. First, we proposed ...
Dogrusoz, U.; Belviranli, M. E.; Dilek, A. (Institute of Electrical and Electronics Engineers, 2013)We present a new algorithm for automatic layout of clustered graphs using a circular style. The algorithm tries to determine optimal location and orientation of individual clusters intrinsically within a modified spring ...