Instincts, Drives, and Hunger - PowerPoint PPT Presentation

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Instincts, Drives, and Hunger

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Instincts, Drives, and Hunger

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  1. Instincts, Drives, and Hunger

  2. Instincts • A pattern of behavior that is passed on through a species that can’t be unlearned • Building nests • Swimming upstream • Migration • Rooting

  3. Drives • An aroused state of tension motivating a course of action • You are driven to fulfill physiological needs • Plan to get food, avoid pain, etc.

  4. Drive-Reduction Theory • You have a need: food/water • You have a drive: hunger/thirst • You have a drive reducing behavior: eating/drinking

  5. Incentives • Positive or negative environmental stimulus that motivates behavior • Physical attraction • Fear of disapproval • Scholarships • Failure

  6. Ancil Keys • WWII Prison Camps • Fed enough to maintain initial weight, then cut food supplies in half • The men became obsessed with food • Nothing else was important

  7. Physiology of Hunger • Walter Cannon – swallowed balloon to see if stomach contractions & hunger pangs were related • He had stomach contractions when he felt hungry

  8. Body Chemistry and the Brain • The hypothalamus has two centers within that help control eating • Lateral hypothalamus (LH) brings on hunger • Ventromedial hypothalamus (VM) depresses hunger

  9. Hormones and Pills • Scientists know of hormones and proteins that stimulate hunger and depress hunger (leptin, ghrelin, PPY) • Trying to find a miracle pill to work with these to regulate weight

  10. Set Point Theory • Older theory • Body’s weight thermometer • If you eat too much, you body is supposed to stop at your set point • Same thing happens of you don’t eat enough

  11. Basal Metabolic Rate • In order to maintain our bodies’ set point, our bodies need to maintain their basal metabolic rate • Too much food – fidget • Too little food – slow down body process

  12. Cultures shape “beauty” - thin Men/women views of what’s thin Eating Disorders

  13. Anorexia • Normal sized people become obsessed with losing weight • Continues to feel fat • Diets turn to starvation • At least 15% below normal body weight

  14. Bulimia • Quick fix to lose weight • Binge eat high calorie foods followed by: • Vomiting • Laxative use • Fasting • Excessive exercise