OCCLUSION
  1. something hidden, an occlusion of memory is something forgotten, i.e. not available to conscious recall. An occluded case is one whose memory is usually largely occluded and whose field of awareness is black or very dark. (COHA Gloss)
  2. occlusion is simply using remote viewpoints and then having the remote viewpoints go blank. (5410CMlOB)
  3. loss of viewpoint of effects. When one has lost a viewpoint with which to perceive effects and upon which he depended for all perception of effect he is very occluded. (PAB 4)


Technical Dictionary