Lisa Eberhardt and Anke Huckauf investigated crowding effects (i.e., reduced recognizability of peripherally presented visual stimuli which are flanked by similar stimuli) in real depth. The data show similar effects to two-dimensional space: Crowding increases with increased stimulus distance in depth from fixation depth.
The paper can be viewed online using the following link.
New paper in Attention, Perception, & Psychophysics
Universität Ulm Universität Ulm