ap psych unit 8a.1 motivational concepts & hunger copy · 2019-11-22 · are you motivated? •...
TRANSCRIPT
APPSYCHUnit8A.1MotivationalConcepts
&Hunger
• Whatismotivation?• Whatmotivatesyou?• Fromwhat4perspectives do
psychologistsviewmotivatedbehavior?
AreYouMotivated?
• Motivation - aneedordesirethatenergizesanddirects behaviortowardsagoal.
• Thereareveryclosetiesbetweenemotionsandmotivatedbehaviors.
• AronRalstonStory– Howdoeshisstorymakeyoufeel?
thismotivateyouormakeyoufeel like you’vedonenothingwithyourlife?!
1.Instincts&EvolutionaryPsychology• Instinct - Acomplexbehaviorthathasapatterninaspecificspeciesandisunlearned.– Seaturtles,newlyhatchedonabeach,willautomaticallymovetowardtheocean.
– Humans:rooting,suckling,andsleeping
– Reflexes
1.Instincts&EvolutionaryPsychology
• Ismotivationsimplyaninstinct?(InstinctTheory)– Notexactly,it’sacomboofpsychologicalneeds&psychologicalwants
– Butyes,evolutionandinstinctplayaroleinbehavior,justnotmotives
2.Drives&Incentives• Instincttheorywasreplacedbydrive-reductiontheory.
• Drive-ReductionTheory- aphysiological needcreatesanaroused stateoradrivethatmotivatestheorganismtosatisfytheneed.– HungerorThirst
Drives&Incentives• TheaimofDrive-ReductionTheoryistoattainhomeostasis.
• Homeostasis -balancedorconstantinternalstate.Thewordliterallymeans“stayingthesame.”– Causesa“drive”– Bodiestemperatureregulation
Drives&Incentives• Incentive - positiveornegativeenvironmentalstimulusthatmotivatesbehavior.
• Wearenotjustpushedbyourneedtoreduce“drives”wearealsopulledbyincentives.• Somebodywhoisfooddeprivedandsmellsbakingbreadfeelsastronghungerdriveandthebreadbecomestheincentive.
• Nature(inbornphysiologicalneed)vs.Nurture (incentives intheenvironment)
3.OptimumArousal
• Somemotivatedbehaviorscanbeexplainedbythewanttobearoused.• Wearemotivatedanddrivenbycuriosity,wearefascinatedbynovelornewthings.
• ArousalTheory-Motivationaimsnottoeliminatearousalbuttoseekoptimumlevelsofarousal.• WhatgotAron Ralstonstuckunder thatrockinthefirstplace??
• Boredom=lackofstimulation&arousal
4.Maslow’sHierarchyofNeeds• Developed byAbraham
Maslow• Someneedstakepriority
overothers• Thirstpreoccupiesyouwhen
desperately thirsty• When lowerneedsare
satisfiedwefocusonhigherneeds
• HierarchyofNeeds –pyramidofhumanneeds,beginningwithphysiologicalthatmustfirstbesatisfiedbeforemovinghighertoeachtier,thenup,thenup
Maslow’sHierarchyofNeeds
• Whatisself-transcendence?
• Aretheselevelsuniversallyfixed?
• Aretheythesameforeveryculture?
Maslow’sHierarchyofNeeds• Consideryourown
experiences inrelation tothehierarchy. Haveyoueverexperienced truehungerorthirstthatdisplacedyourconcernforother,higher-levelneeds?
• Doyouusuallyfeelsafe?Loved?Confidant?
• Thehigher tierscanbecomemuchlessimportantinemergencysituations.
Hunger
AncelKeysExperimentFed36volunteers justenoughtomaintaininitialweight.Thencutrationsinhalf.• Bodystabilizedat25%belowstartingweight• Beganconserving energy• Becamefoodobsessed• Alleffortswerefocusedtowardtheirnextmeal• Lostinterestinanyactivitiesnotinvolving food(sex,socialactivities)
Foodandhungerhasapowerfuleffectonus.
PhysiologyofHunger• Ourstomachscontractwhenwefeelhungry
(seebelow)• Butthisisonlyonesourceofhunger
BloodChemistry&TheBrain
• Whenourbloodglucose (sugarthatcirculatesinourblood,majorsourceofenergyforbody)leveldrops,signalswillbesentfromthestomach,intestines,andlivertothebraintotriggerhunger
• Thehypothalamus triggershunger-monitorsthebody’sappetitehormones
BloodChemistry&TheBrain
• Damagetothehypothalamuscancreateweightdifficulties – either toomuchorlittle.
• LH(lateralhypothalamus– triggershunger))vs.VMH(ventromedialhypothalamus– lowershunger)
• Mnemonic: LargeHunger,LingeringHungervs.VeryMiniHunger
TheAppetiteHormones• Insulin:Secretedbypancreas;controlsbloodglucose
• Leptin:Secretedbyfatcells;whenabundant,causesbraintoincreasemetabolismanddecreasehunger
• Orexin:Hunger-triggeringhormonesecretedbyhypothalamus.
Couldwemanipulateappetitehormonesandtreatanorexiaorobesity?
TheAppetiteHormones• Ghrelin:Secretedbyemptystomach;sendsout“I’mhungry” signalstothebrain;decreasesaftermeals• Bypasssurgeryeffectsthis
• Obestatin: secretedbyfullstomach,sends“I’mfull”signals,suppresseshunger
• PYY:Digestivetracthormone;sends“I’mnothungry”signals
Couldwemanipulateappetitehormonesandtreatanorexiaorobesity?
SetPoint&BMRSetpoint– thepointatwhichanindividual’s“weight thermostat” issupposedlyset.Whenthebodyfallsbelowthisweight,adecreasedmetabolicratemayacttorestorethelostweight•Thetheoryofthesetpointisnotaswidelybelievedanymore.Basalmetabolic rate– thebody’srestingrateofenergyexpenditure•Researchersbelievepeoplereacha“settlingpoint,” thelevelatwhichaperson’sweightsettlesinresponsetocaloricintakeandexpenditure
TheyPsychologyofHungerPartofbeinghungryisknowingwhenourlastmealoccurred, andwhattimewenormallyeatat.•Amnesiaexperiment– ifoffered foodpeoplekeepeating
Psychological influencesoneatingbehavioraremostextremewhenthedesiretobethin overwhelms normalhomeostaticpressures
TastePreferences:BiologyBothbiologyandcultureplayaroleinfoodpreferences.
CarbsboostSerotonin levels,creatingacalmingeffect.Thisleadstothelabelofcomfort foods.•Doyoucravecertain foodsincertainstressfulsituations?
Preferences forsweetorsaltyisgenetically based.
Sometastepreferences areconditioned – anacquired tasteortheopposite– atasteaversion
TastePreferences:Culture• Differentculturesenjoydifferent
foods• Examples?
• Withrepeatedexposure,tasteappreciationforafoodtypicallyincreases
• Areyouaneophobe?• Tastepreferencescanbeadaptive–
hotterclimatestraditionallyusedmorespicetokillbacteria
• Pregnancyrelatenauseaandcravings• changinghormone levelsaffect
tastepreferences inpregnantmoms
TheEcologyofEatingSituationalEating:Peopleeatmorewhentheyareeatingwithothers–socialfacilitation- explainswhywemayeatmoreduringtheholidays
UnitBias- Portionsize– Countriesthatofferservingsinsmallersizesarethinneronaverage
Experimentwithbowlorspoonsize– biggersizesmeanyouwilltakemore•Souseasmallerplate!
EatingDisordersAnorexiaNervosa– Aneatingdisorderinwhichaperson(mostlikelyanadolescent)dietsandbecomessignificantly(15%ormore)underweight,yetstillfeelingfatcontinuestostarve
Bulimianervosa– aneatingdisordercharacterizedbyepisodesofovereating,usuallyhighcaloriefoods,followedbyvomiting,fasting,laxativeuse,orexcessiveexercise
Binge-eatingdisorder– significantbingeeating,followedbyguilt,withoutthepurgeofbulimia
EatingDisorders
Geneticsmayinfluencesusceptibilitytoeatingdisorders
Thereareculturalfactors• InIndia,womenratetheirshapetheclosesttotheiractualshape• InAfrica,beingalittlelargermeansprosperity
Generationally, thenumberofeatingdisordershaverisenas50%ofwomensaytheyfeelnegativeabouttheirappearance
GenderDifferencesMuscledysmorphicdisorder–bigorexia– Peoplewiththisdisorderobsessaboutbeingtoosmallandfrailandundeveloped.Eveniftheyhavegoodmusclemass,theybelieve theirmusclesareinadequate.
Menaremorelikely tobeoverweight, andwomenaremorelikely toperceivethemselvesasoverweight
MediaandBodyImagePartofthe issueswithbodyimageintoday’ssocietyarewhatisportrayed“sexy” or“attractive” inthemedia
Peoplebegintoidealizemediaportrayalswhichleadstodissatisfactionwithpersonalbodyimage
IfBarbiewerereal,shewouldbeabout6’ tall,havea39”bust,18”waist,33” hips