The aim of this paper is to review recent work concerning the psychobiological substrates of
social bonding, focusing on the literature attributed to opioids, oxytocin and norepinephrine …

Based on the presentations given by well-known specialists at a recent multidisciplinary
conference of developmental psychobiologists, obstetricians, and physiologists, this book is …

The existence of organized responses to milk in newborn mammals, which lack experience
at the nipple, implies the prenatal development of neural and behavioral systems for …

To determine how rat mothers protect their pups against pain, we applied focal heat (34–51
C) to the ear or shoulder of 10-day-old rats that were isolated, in contact among themselves …

We assessed the neurochemical basis of olfactory learning induced by presentations of odor
and moderate shock in infant rats. Paradoxically, shock conditioning produces an odor …

To support nipple attachment and huddling, rat pups must learn to approach and prefer
maternal odor. Similar to other altricial species, rat pups have a sensitive period for learning …

Stress during the neonatal period leads to a large number of behavioral and biochemical
alterations in adult life. The aim of this study is to verify the effects of handling and tactile …

Previous results show that endogenous opioid systems mediate affective responses in
neonatal rats. Opioids modulate isolation-induced ultrasonic vocalizations and analgesia …

Milk promotes activity in the kappa opioid system of the rat fetus and reduced
responsiveness in a behavioral bioassay of cutaneous sensitivity. In the study, E20 rat …

Although born blind and deaf, newborn rats exhibit a remarkable capacity to recognize and
gain access to the nipples of the lactating mother. However, it is well‐known that full‐term rat …