Although no doctor can be available to every patient all the time, your patients' perception of your availability is important, particularly to personality-disordered patients who have not achieved object constancy
I believe that Spero's four other stages of development can be placed here, as the individual moves haltingly through the stages of symbiosis, practicing, and rapprochement, towards the achievement of "emotional object constancy
A second and related perceptual process is object constancy
(or viewpoint invariance), which is the ability to recognize two different views of an object as the same 3D distal object.
The child strives to reduce the discrepancy by internalizing an image of the primary caregiver, thereby developing object constancy
and tolerating separation (Kobak & Cole, 1994).
The eminent developmental psychologist, Jean Piaget, speaks of a stage in cognitive development which he calls object constancy