PSYO 2470 Lecture 8: motivation 2
2 May 2017
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Document Summary
Feeding as a response to drive reduction: reducing hunger drive, fueling need a certain amount of energy. In the hypothalamus stimulate feeding: amsh/cart. In hypothalamus inhibitory effect on feeding: overeat when we ignore biological signals. If something is delicious, don"t listen to satiety signals. Somatic responses have lots to do with actual feeding voluntary control: food seeking and ingesting behaviour is under voluntary control, motivation and reinforcement. Vta: cocaine activates the axon terminal of the dopamine neurons in the nucleus accumbens, pathway operates under unconscious control, rat vta. Found in ventromedial area: ventral to vta are the dopaminergic cell bodies of the substantia. Something worse than expected, see phasic decrease in dopamine signalling. Secondary reinforcer takes over the dopamine signalling from the primary reward. Dopamine, wanting, and liking: dopamine appears to be more involved in wanting rather than liking. Just seeing more wanting in knockdown mice with no increase in liking.
