Psych335-AffiliationandAggression - Affiliation and...

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Affiliation and Aggression Affiliative and aggressive behaviors. 1. Pair bonding. 2. Social recognition 3. Aggression(s) Pair bonding between male and female Relatively uncommon among mammals ~3% of all mammalian species ~15% of primates (including humans) Studied most intensely in voles Several closely related species Different social patterns Some species of voles form pair bonds 1. Male and female pair up until death do they part If partner dies, only ~20% go on to form new pair bonds 2. Share living space and hang out together. 3. Share pup care tasks (although male might not be the father) 1. Form pair bonds Like to ‘cuddle’ 2. Puberty delayed as long as they live at home. Females ovulate, mate and pair bond within 24 hr of exposure to urine from a strange male. Males pair bond with females and become aggressive toward strangers within 24hr of meeting. 3. Mom and dad both parental 4. Young very distressed by separation. Ultrasonic vocalizations Elevated cortisol 1. No pair bonds No cuddling - even in small cages 2. No social inhibition of puberty 3. Only mom parental Mom may split after 8-14 days 4. Young not distressed by separation.
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Hormonal control of pair bonding in voles Oxytocin (OT) and vasopressin (AVP) are two peptides which induce pair bonding in voles. In this case, OT and AVP are acting as neurotransmitters rather than posterior pituitary hormones. Both OT and AVP projections and receptors are widely distributed in the brain. OT controls pair bonding in females, and AVP does in males. AVP and OT distribution in vole brains: Oxytocin distribution and projections do not differ between monogamous and polygamous species, nor between males and females. Vasopressin distribution and projections do no differ greatly between monogamous and polygamous species. Infusion of vasopressin and oxytocin or their respective antagonists do not induce pair bonding in the meadow voles. Thus, the distribution of oxytocin and vasopressin cannot account for the species differences in the pair bond formation. Oxytocin receptor distribution in female prairie vole vs. female meadow vole
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Psych335-AffiliationandAggression - Affiliation and...

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