Global Processes in Stereopsis: Some Comments on Ramachandran and Nelson (1976)

Abstract
The use of the term ‘global’ in the context of stereopsis is discussed. It is concluded that different meanings of this term need to be kept carefully distinguished at all times. The discussion centres around a series of demonstrations introduced by Ramachandran and Nelson, and interpretations are offered for these demonstrations in terms of spatial-frequency-tuned stereopsis channels.