PSYC 100 Lecture Notes - Lecture 8: Basal Metabolic Rate, Blood Sugar, Ghrelin

• School: McGill University
• Department: Psychology
• Course: PSYC 100
• Professor: Jens C Pruessner

Document Summary

Motivation: need and desire that energizes and directs behaviour. Instinct theory: replaced by evolutionary perspective, focuses on genetically predisposed behaviours. Arousal theory: focuses on finding right level of stimulation. Instinct: complex behavior that is rigidly patterned throughout a species and is unlearned. Rather than explaining human behaviours, early instinct theorists were simply naming them. Drive-reduction theory: idea that a physiological need creates an aroused tensions state (negative drive) that motivates an organism to satisfy the need. Physiological need increases, physiological drive increases, an aroused and motivated state focuses on inner pushes and external pulls interaction need food drive with hunger drive reducing behaviour such as eating. Homeostasis: tendency to maintain a balanced and constant internal state, regulation of any aspect of body chemistry, eg. blood glucose at a particular level. Glucose: form of sugar that circulates in blood provides major source of energy for body tissues. When level is low feel hunger.