1. Hypothalamic–pituitary–adrenal responses in neonatally handled and nonhandled rats: differences in facilitatory and inhibitory neural pathways;Bhatnagar,1996
2. Attachment;Bowlby,1969
3. Hormonal responses accompanying fear and agitation in the squirrel monkey;Coe;Physiol. Behav.,1982
4. Plasma-corticosterone levels during active avoidance learning in rats;Coover;J. Comp. Physiol. Psychol.,1973
5. Conditioned decreases in plasma corticosterone levels in rats by pairing stimuli with daily feedings;Coover;J. Comp. Physiol. Psychol.,1977