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Lecture 6

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University of Toronto Scarborough
Horatio Morgan

Lecture 6  Oxytocin does not affect the male bird song but does affect female pair bonding  In voles, it does the same type of function; it makes the females far less likely to ever mate again with another person and the male will aggressively defend its female, home and territory  When it asks you about sensory ques, it refers to any senses; eg. Olfaction, tactile (touching) etc  Prairie voles are monogamous but montane voles are polygamous  When mamals exhibit bonding, it is related to high oxytocin and vasopressin  It has been shown that there are higher vasopressin 1a receptor (V1aR) binding in ventral pallidum (VP) of praire voles than in montane vles  Also more oxytocin receptor (OXR) binding occurs in prairie voles in the nucleaus accumbens (nacc) and medial prefrontal cortex (mPFC)  We can also see that contact time is higher for partners rather than strangers; in mating or in just usual circumstances; when given oxytocin or vasopressin, it increases contact time for partners and decreases stranger contact; when given the antagonist, it makes them more promiscuous  Lac-z from the graph is just a control chemical; its not known to have an affect so that’s why we use it; to see what it would look like without an effect  When this test was done on promiscuous voles, it was also shown to increase their contact time with partners and less with strangers  Parenting however was not affected by vasopressin; it was tested on both prairie and montane voles; no significant difference between control and experimental; this suggests that the mechanism are controlled by different pathways  When V1aR is added to the anterior hypotothalamus, the aggression of males increased towards strange females; this did not occur in the lateral septum  Arginine vasopressin gene is the gene that affects all this bonding and stuff  When giving dopamine antagonist, the praire voles did not stick to one partner; they had a variety of partners; especially at high dosages of the antagonist  Then they went on to affect certain dopamine receptors or certain complexes that involved dopamine reception; this was also shown to affect the voles although teacher never went into clear detail  It was also shown that those voles that wandered far away from home, had less reproduction than did those that remained home  Brain regions
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