p179fig04.56 Final steps in generating a visible, figure-ground separated, 3D surface representation in V4 of the unoccluded parts of opaque surfaces.<BR>|| Visible surface perception. <TABLE border="1"><TR><TD><B>Boundary enrichment:</td><TD><B>near</td><TD><B>far</td><TD>asymmetry between near & far</td></tr><TR><TD>V4</td><TD>horizontal rectangle</td><TD>horizontal & vertical rectangles</td><TD>cannot use these (overlapping?) boundaries for occluded object recognition</td></tr><TR><TD>V2</td><TD>horizontal rectangle</td><TD>vertical rectangle</td><TD>use these boundaries for occluded object recognition</td></tr><TR><TD><B>Visible surface filling-in:</td><TD>filling-in of entire vertical rectangle</td><TD>partial filling in of horizontal rectangle</td><TD>visible percept of unoccluded [vertical] surface</td></tr></table>