Spatiotemporal Boundary Formation Demos Kellman lab UCLA Tandra Ghose & Phil Kellman

Global motion, continuous surface boundaries and object shape can be perceived from visual information that is fragmentary in both space and time.Shipley and Kellman (1994) showed that element trasnformation such as local element changes in color, orientation or location are as effective a cue to spatiotemporal boundary formation as the previously known cue of accretion and deletion of texture (Gibson, 1968). Note that in the movie shown below no specific form/shape can be percieved in a single static frame of the movie. 

Movie-1: Spatiotemporal Boundary Formation

Shipley, T.F. & Kellman, P.J. (1994). Spatiotemporal boundary formation: boundary, form, and motion from transformations of surface elements. Journal of Experimental Psychology: General , 123, 1, 3-20.