Completeness of filling-up in the filled/unfilled illusion

Abstract

The present study is concerned with a contextual filling-up inducing the illusion of extent. The data of the psychophysical experiments demonstrated the presence of processes of spatial integration along the main stimulus axis. The dependencies established were used to verify the predictions of our semi-empirical computational model, and it was demonstrated that the model calculations adequately account for the illusion magnitude variations shown by all the subjects tested.