Long range grouping mechanisms for object perception.

The case made by Kogo and Wagemans for border ownership of surface boundaries to explain modal completion of illusory contours is well argued, and is compatible with psychophysical and physiological research on configural interactions with stereoscopic depth processing. However, it is important to contextualize such a mechanism of surface interpolation with related object grouping mechanisms in visual cortex, such as those not necessarily related to depth. Additionally, it's worth considering how the BOWN model can be generalized beyond Kanizsa shapes to more complex volumetric surface interpolations.