We investigated learning of spatio-temporal interpolation in depth and its
relation to spatio-temporal interpolation in two dimensions by means of a v
ernier discrimination task. Performance improved with training but improvem
ent did not or only partially transfer between opposite directions of motio
n in depth. Improvement was also at least partly specific for the eye and f
or the direction of two-dimensional motion used during monocular training.
This specificity might explain the apparent specificity of interpolation in
three dimensions. Training with stimuli moving in two dimensions increased
performance for a stimulus moving in depth. The results indicate that impr
ovement in spatio-temporal interpolation occurs at least partly on a stage
preceding stereoscopic vision, and are a rare example for transfer of impro
vement between different perceptual tasks. (C) 1999 Elsevier Science Ltd. A
ll rights reserved.