Week 9 Flashcards
(53 cards)
Instincts
unlearned patterns of behaviour – biologically determined, not learned (e.g., babies crying/suckling, seeking out sexual partners)
Instincts provide the energy that channels behaviour in appropriate direction
Issues with instinct approaches
- Psychologists do not agree on what, or even how many,
primary instincts exist - Does not clearly explain why one specific pattern of
behaviour, and not others, has appeared in a given species - Due to how much of the variety and complexity of
human behaviour is learned, behaviour cannot be seen as instinctual.
What is drive reduction approach
Behaviour motivated by need to reduce internal tension caused by unmet biological needs
What is drive
motivational tension, arousal that energizes behaviour to fulfill a
need
What is negative feedback
unpleasant feeling until need is met
What are primary and secondary drives
Primary drives: drives related to biological needs
* Hunger
* Thirst
* Sleep
Secondary drives: are those that prior experience and learning bring about needs
* Knowledge
* Financial well-being
* Personal achievement
Challenges with drive reduction
- Overemphasizes biological needs (primary drives)
- Doesn’t account for nonhomeostatic behaviours
- E.g., curiosity or thrill-seeking
behaviours that increase
tension/arousal
Maslows hierarchy of needs
- Primary needs must be satisfied before higher order needs
- Base has basic needs (e.g., food, water) – fundamental to survive E.g., students perform better when basic needs are met!
- Sequential progression
- Intuitive, but difficult to falsify
- However there are times where people purposelly put their secondary needs before their primary ones
Incentive approach
- Motivation stems from desire to obtain valued external goals or incentives
- Desirable properties of external stimuli (e.g., grades, money, affection) account for individual’s motivations
- Explains why we may succumb to incentive (e.g., dessert) even though we lack internal cues (e.g., hunger)
Arousal approaches
- We strive to maintain certain levels of stimulation & activity, increasing or reducing as necessary People vary in optimal levels of
arousal - E.g., someone who loves extreme sports vs. someone
who loves calm activities
Overjustification effect
Occurs when providing excessive external rewards for an activity that is already intrinsically motivating leads to a reduction in intrinsic motivation
Motivation
people’s thoughts, expectations & goals (their cognitions)
Cognitive approach
Intrinsic motivation and extrinsic motivation
Intrinsic motivation: motivation driven by internal rewards or personal satisfaction (e.g., a physician working long hours because they love medicine)
Extrinsic motivation: motivation driven by external rewards or pressures (e.g., a physician working hard to make a lot of money)
Lepper, Greene & Nisbett
Lepper, Greene & Nisbett (1973)
* Preschoolers who enjoyed drawing either given (1) expected reward (2) unexpected reward (3) no reward
* Expected reward group showed significant decline in intrinsic motivation!
What are glucose levels monitored by ?
Biological basis of hunger
- Glucose levels monitored by hypothalamus (via weight set point?)
Biologoical basis of hunger
What would an injury to the hypothalamus cause (hunger)
Biological basis of hunger
- Injury to hypothalamus has radical consequences for eating behaviour
- Lateral hypothalamus (go)
- Ventromedial hypothalamus (stop
Biological basis of hunger
Ghrelin, Leptin and insulin
hormones
Hormones
* Ghrelin– increases eating (reduced after gastric bypass)
* Leptin – produced by fat cells, signals satiety, reduces hunger
* Insulin – secreted by pancreas, regulates satiety & food intake
What happens when you have an empty stomach
sends signals to brain to stimulate hunger
What do stretch rectors do
Detect fullness & send satiety signals to brain
How does the brain reward system play a role in the biological basis of hunger
Reward system – dopamine!
* Brain’s reward system plays a role – especially for highly palatable foods – release of dopamine reinforces behaviours
Environmental & psychological influences (sight, smell,
stress, etc.)
What does ozempic do
Lower hunger drive: Mimics (enhances) GLP-1
hormone – naturally produced to help regulate
blood sugar & appetite
- GLP-1 receptors reduces hunger signals, feel
fuller for longer periods
Reduced cravings: Ozempic also dampens brain’s response to food-related cues – makes eating less rewarding or pleasurable
* Slows gastric emptying
Social/environmental factors on hunger
Biological factors alone do not explain our eating behaviours!
* Culturally learned preferences & habits
* When, what you eat, stress-eating, comfort foods, etc
* Social norms/societal rules
* Food-related cues (appearance, odour, effort required)
* Stress - link between heightened arousal/negative emotion & overeating
Culture & food: Philadelphia vs. Paris (Rozin et al., 2003)
Portions much larger in Philadelphia
* Mean portion sizes in restaurants: 25% larger
* Mean item sizes (e.g., candy bar) 41% bigger
* Mean portion sizes in cookbooks
Time spent in MacDonalds
* Philly M=14.4 min
* Paris M=22.2 min
Americans 3x more likely to be obese than
French!
Eating in italy
- Limited take-out options
- Social norm is to stop and have your coffee – no rushing!
- Eating as social
- Antipasto/primo/secondo/aperitivo
- Certain foods/beverages reserved
for the specific times - Weekly markets, focus on in season
foods