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Lecture 17

Lecture 17 - Mar 22.doc

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PSYC 342
Jens C Pruessner

PSYC 342 Lecture 17 - Mar. 22 Outline: • Three aspects of attachment • Partner attachment • Parental attachment • Trust Partner Attachment - The Prairie Vole: • Male and female form long-lasting bonds • Share a burrow to live together and raise offspring • Female becomes socially exclusive after initial bonding, preferring her mate over others • The male ferociously guards his mate against rivals The Montane Vole: • Male and female occupy separate burrows and avoid each other except to mate • Mating occurs often and indiscriminately • Lacks any family values an are asocial Oxytocin and Vasopressin: • Oxytocin receptors three to seven times higher in prairie voles compared to montane voles • Receptors are concentrated in NcAc and PLC • While montane voles have the hormone, they are not responding to its effects • Oxytocin receptor location in Montane vole and Prairie vole differs Parental Attachment - The Prairie Vole: • Male and female raise their young together • The female is willing to sacrifice her life to protect her offspring • Male devotes his life to finding nutrients while female is nursing the offspring The Montane Vole: • Mother abandons her pups sixteen days after birth • The father never sees the offspring • When plucked from the nest by a predator, the offspring neither calls for help nor responds with stress hormone release Oxytocin and Vasopressin: • Number of oxytocin receptors surges in female mountain voles during the 16 days of nursing • This is the absolute minimum time necessary to ensure survival of the offspring (and thus survival of the species) Further Evidence From Laboratory Studies: Impact of Vasopressin: Link to Human Behaviour: • Vasopressin and oxytocin in humans serve similar purpose • Maternal behaviour arises from hormonal changes induced by oxytocin and vasopressin • After birth, offspring stimulates secretion of oxytocin and vasopressin • Visual, tactile, olfactory sti
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