Castelo-Branco M, Kozák L R, Teixeira J, Xavier J, 2007, "The role of visual area hMT/V5 in dissociating perceptual decision from veridical stimulus properties" Perception 36 ECVP Abstract Supplement
The role of visual area hMT/V5 in dissociating perceptual decision from veridical stimulus properties
M Castelo-Branco, L R Kozák, J Teixeira, J Xavier
The mechanisms triggering perceptual decision were studied with bi-stable stimuli: during neuroimaging experiments subjects were asked to report, by means of button presses, their interpretation of two superimposed gratings moving in different directions (plaid stimuli). Plaids may be perceived either as two surfaces, one being transparent and sliding on top of the other (component motion) or as a single coherent pattern whose direction of motion is intermediate of the component vectors (pattern motion). We have constructed textured plaid stimuli that can be physically disambiguated into pattern and component motion by parametrically defined local dot movement. We found that hMT+ complex directly encodes and triggers decision processes related to surface segmentation, even when perception is dissociated from veridical stimulus properties.
[Supported by POCI_SAU-NEU_60281_2004, Bial 15/02, and Gulbenkian Foundation: Estímulo à Investigaçao/02.]
These web-based abstracts are provided for ease of seaching and access, but certain aspects (such as as mathematics) may not appear in their optimum form. For the final published version of this abstract, please see
ECVP 2007 Abstract Supplement (complete) size: 2091 Kb