Psychology 1000 Lecture Notes - Homeostasis, Blood Sugar, Lateral Hypothalamus

• School: Western University
• Department: Psychology
• Course: Psychology 1000
• Professor: Terry Biggs

Document Summary

Adaptive significance: we are motivated to engage in behaviour that promotes survival advantages. Physiological disruptions to homeostasis produce drives to behave in a certain way (e. g. thirst influences drinking) Goal-directed behaviour is jointly determined by expectation that behaviour will lead to a goal and the value the individual places on the goal (incentive value) Performing an activity to obtain an external reward or avoid punishment. Performing an activity because you find it enjoyable or stimulating. Decreases in blood glucose levels are detected by liver sensors, which convert stored nutrients back into glucose. Drop-rise pattern may be a signal of hunger to the brain. Peptides sent into bloodstream as food arrives in intestines from the stomach. Leptin: a hormone in the fat cells that decreases appetite (halaas et al. , 1995) Lateral hypothalamus (lh): may be involved in stimulating eating, but is not a hunger on center. Ventromedial hypothalamus (vmh): may influence stopping eating, but is not a hunger off center.