“Adaptive recruitment of binocular correlation and matching computations to stereopsis”

The world where we are and the world we perceive are spatially 3-dimensional (3-D), or they have depth. We feel, in addition to understanding, that every object has a particular shape and thickness, occupies a volume, and is separated in depth from others in space. This sensation of three-dimensionality originates from the fact that the left and right eyes view the world from laterally separated positions. The geometry creates a tiny horizontal shift between the projections of each visual feature onto the respective retinae, i.e., binocular disparity. The visual system uses this cue to achieve a reliable and accurate sense of depth, and supports manipulation of 3D objects and navigation in 3D environments. In this process of binocular depth perception, or stereopsis, the visual system carries out two distinct computations, binocular correlation and binocular matching. This project tests a hypothesis that depth perception is determined by a weighted sum of two parallel computational processes, binocular computation and binocular matching, and the relative weight changes adaptively under different visual circumstances.

 
Recent Publications
1. Fujita I, Doi T (2016) Weighted parallel contributions of binocular correlation and match signals to conscious perception of depth. Phil Trans R Soc B 20150257. doi: 10.1098./rstb.2015.0257
2. Abdolrahmani M, Doi T, Shiozaki HM, Fujita I (2016) Pooled, but not single-neuron, responses in macaque V4 represent a solution to the stereo correspondence problem. J Neurophysiol 115: 1917-1931
3. Tanaka, S., & Fujita, I. (2015) Computation of object size in visual cortical area V4 as a neural basis for size constancy. J Neurosci 35: 12033-12046.

Posted:2016/03/10