PS102 Lecture Notes - Body Mass Index, Libido, Antidiuretic

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Published on 20 Apr 2013
School
WLU
Department
Psychology
Course
PS102
Professor
PS102 March 19th 2013
Chapter 12 Motivation:
Motivation:
o All of the processes that indicate, direct and sustain behaviour
o Motives are needs or desires that direct or energize behaviour
o Goal Directed
o When motives are internal they push us to act call these drives thirsty
o When motives are external (or outside of us) we call them incentives they
pull or entice us to act
Drives:
o Directed
o Make us driven make us act
How do we direct that behaviour?
o Self-regulation:
o Homeostatis
- stable internal equilibrium
- temperature control
- reflective, involuntary
- supplement, voluntary behaviours
The primary drives: Thirst and Hunger
- Primary drive stems from unlearned motives to satisfy biological needs
- Satisfied through : reflexive compensatory mechanisms, couples
with directed behaviour
Thirst:
- we continually loose water
- Extracuricullar thirst: occurs when body tissues lose fluids, such as
when one perspires while exercising
- Intracellular thirst: occurs when body cells lose water, such as when
one eats salty foods
How do we solve the thirst problem?
- 1. Antidiuretic Hormone
- 2. Volume Receptors
- 3. Osmoreceptors
- 4. Behvaiour getting a drink
Hunger Drives:
- Internal cues motivate hunger by stimulating the hypothalamus in the
brain, receptors from stomach and intestines and liver
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- External cues motivate hunger when we see, smell or taste foods that
we like. Also learning
Internal Cues:
- Receptors in the Brain
- Location Hypothalamus
- Receptor for Glucose
- Measures amount of glucose available for metabolic consumption
- Receptors in Stomach and Intestine
- Why stop eating?
- Leptin hormone produced by fat cells
Signals from the outside:
- Palatability taste, smell, texture
- Learning schedules for eating expected meal times, others will
influence what we eat
Eating problems: Too much or Too little of a good thing
- Obesity and belemia and anorexia
Obesity:
- Definition varies:
- 20% above the average weight for a given height
- Body Mass Index BMI- individual’s weight divided by height, squared,
-30 or higher obese
What causes Obesisty?
- genetic Predispositions
- Excessive eating/ inadequate exercise
- Set Point Theory
Obesity: Set point theory:
- Normal levels of body fat are between 22 to 26%
- Set point: The weight the body maintains when one is not trying to gain
or lose weight
- Stability point
- Settling point: equilibrium idea, but can re-set if long period of change
Eating Disorders:
- Anorexia nervosa: An overwhelming, irrational fear of gaining weight
or becoming fat, compulsive dieting to the point of starvation, and
excessive weight loss
- Bulimia nervosa: A chronic disorder characterized by repeated and
uncontrolled episodes of binge-eating, appears to be of a normal
weight, vomiting and laxatives
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Document Summary

Drives: directed, make us driven make us act. How do we direct that behaviour: self-regulation, homeostatis stable internal equilibrium temperature control reflective, involuntary supplement, voluntary behaviours. Primary drive stems from unlearned motives to satisfy biological needs. Satisfied through : reflexive compensatory mechanisms, couples with directed behaviour. Extracuricullar thirst: occurs when body tissues lose fluids, such as when one perspires while exercising. Intracellular thirst: occurs when body cells lose water, such as when one eats salty foods. Internal cues motivate hunger by stimulating the hypothalamus in the brain, receptors from stomach and intestines and liver. External cues motivate hunger when we see, smell or taste foods that we like. Measures amount of glucose available for metabolic consumption. Leptin hormone produced by fat cells. Learning schedules for eating expected meal times, others will influence what we eat. Eating problems: too much or too little of a good thing. 20% above the average weight for a given height.

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