Unformatted text preview: 3/6/11 1 3/6/11 Cooper & Zubek (1958) Can J Psychol, 12: 159-164 2 3/6/11 3 3/6/11 Corder et al., 1993. Science,
261: 921-923. 4 3/6/11 5 3/6/11 http://en.wikipedia.org/wiki/File:Gene2-plain.svg Not shown: Natural selection of genotype 6 3/6/11 These two photographs of rodent dams and their pups depict two maternal behaviors that
represent a high degree of nurturing for newborn rat pups: (A) “arched back nursing” and (B)
“licking and grooming.” Adult offspring of dams that exhibit these behaviors are less fearful
than their counterparts reared by less nurturing dams.
(A) Arched-back nursing. The dam nursing her pups in this photograph has her back and
ventral surface arched, exposing all of her nipples to all pups simultaneously. This makes it
easier for each pup find a nipple and remain attached. In contrast, the nipples of a dam lying
on her side are relatively less accessible. (B) Licking and grooming. The lower portion of this photograph shows the pink, hairless
heads and bodies of several rat pups. The dam, whose fur is black, is licking their skin with
great vigor and frequency, constituting a very strong tactile stimulus for these newborn pups.
This tactile stimulation promotes of a series of biochemical events that culminate in less
fearful adult offspring. 7 3/6/11 8 3/6/11 Tightly bound Loosely bound DNA tightly bound to Histone cannot be read/transcribed 9 3/6/11 http://www.thestylemansion.com/resources/pages/
image1/001645/audrey_hepburn.jpg 10 3/6/11 11 ...
View Full Document