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Adolescence
Psyc311 DevelopmentalDr. Wright
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definition of puberty
• Pubertas – Latin word for “adult”• Narrow definition: The process by
which an individual becomes capable of reproduction.– The activation of the HPG/HPA axis
• Broad definition: The physical, psychological, and cultural changes that occur as the growing child transitions into adulthood.
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time periods of adolescent
• Adolescence is a unique developmental period– it keeps changing!
• Early adolescence – 11 to 13 years old– Continues to be pushed earlier (9-10…)
• Middle adolescence – 14 to 17 years old• Late adolescence (early adulthood) – 18 to 20
years old– Continues to be pushed later (21-24…)
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physical changes…
Primary sex characteristics• The body organs and reproductive structures and
functions that differ between women and men. • Gonads (testes and ovaries)
Secondary sex characteristics• Characteristics of the body that are caused by hormones,
develop during puberty, and last through adult life. • Changes in genitals/breasts/voice• Pubic/body/facial hair
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Tanner Stages
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Tanner Stages
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changes… Rapid acceleration of physical growth
• Adolescent growth spurt• 3.5 (girls) to 4.0 (boys) inches/year• ½ adult weight gained during adolescence
Changes in body composition• 3:1 muscle to body fat ratio for boys• 5:4 for girls • Emergence of sex differences in physical
performance Changes in circulatory and respiratory systems
• Increase in size/capacity of heart and lungs
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two roles of hormones Organizational role (life-long):
– Modification of the organism early in life• primarily influencing its anatomy
– Organization/structure of CNS• “Feminine” vs. “masculan-ized” brain and body
Activational role (specific to puberty):– Structural “remodeling” of brain– Increase in salience of sexual stimuli, sexual motivation – Development of secondary sex characteristics
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hormone regulatory systems
• Endocrine system• HPA axis
– Hypothalamus Pituitary gland Adrenals– Corticosteroids– Regulates body’s response to stress
• HPG axis– Hypothalamus Pituitary gland Gonads
(Testes/Ovaries)– Sex Hormones (Androgens/Estrogens)– Regulates sexual maturation
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The hormonal changes brought on by puberty can affect the adolescent’s behavior in at least three ways.
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impacts of puberty
• Sleep patterns– Delayed phase preference– 9 hours: 1 am to 10 am
• Family relations– Transformation of parent-child bond
• Peer relations– Transformation of friendships, romantic
relationships
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impacts of puberty
• Self-esteem– Changing body image– Changing sense of self
• Moods– Increased stress + Increased sensitivity
• Fluctuation of moods– Due to hormones or environment?– “Storm and stress”: myth or fact?
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moods
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timing - individual factors
• Genetic factors– Timing and tempo
• Environmental factors– Nutrition– Body weight– Exposure to hormones/chemicals– Family conflict– Stepfathers
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timing - group factors
• Comparisons • Across socioeconomic groups
– Impact of poverty– Dietary intake, health care, exposure to disease
• Across countries– Impact of industrialization
• Across time periods– Secular trend
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early maturation
• Boys– Early maturation positives
• Popularity, higher self-esteem– Early maturation negatives
• Deviant, risk behaviors; more rigidity later
• Girls– Early maturation positives
• Popularity (cultural dependence)– Early maturation negatives
• Lower self-esteem, eating disorders, emotions, deviant behaviors
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late maturation
• Boys– Late maturation positives
• Higher levels of creativity, inventiveness– Late maturation negatives
• Low self-esteem, low social competence
• Girls– Late maturation positives
• Thinner build– Late maturation negatives
• Social withdrawal
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the second wave….
Longitudinal fMRI studies reveal:
• Period of rapid synaptogenesis and pruning• Increased myelination (back to front)• Opportunity for massive cognitive growth and
learning– Shift into Piaget’s formal operations
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Among the most important changes to take place in the adolescence brain are those in the prefrontal cortex and limbic system.
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(pre) frontal development
• Final development of executive function– Planning/problem-solving– Impulse control– Seat of “sober 2nd thought”
• Full maturation – sometime between adolescence and early adulthood
• Coincides with child-onset schizophrenia– Failure in executive functioning
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heightened arousal
• Increased hormone activity– estrogen & testosterone
• Sexual stimulation• Social status conflict
• Increased neurotransmitter activity– heightened emotional sensitivity/reactivity
• Limbic system (norepinephrine)– increased risk, stimulation-seeking behaviors
• Punishment/reward system (dopamine)– increased fluctuations in mood
• Serotonin
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timing of brain maturation• Limbic system matures early in puberty• Prefrontal cortex matures several years later
• Heightened need for reward/stimulation– leads to increased risk-taking, stimulation-seeking
behaviors• Higher level of emotional volatility• Underdeveloped “sober” assessment of risks• Increased cognitive/social demands
– Creates cognitive overload– Difficulty with impulse control
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timing of brain maturation
• Time gap may explain why adolescence is a period of heightened experimentation with risky behaviors.
• Increased risk of – violence/criminal activity
• kids under 18 account for 25 of violent crime in US– drug & alcohol experimentation– unsafe sexual activities
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conduct problems
Adolescents whose prefrontal cortical development is less mature than normal are even more likely to have conduct problems.
Populations most at risk?
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teen pregnancy
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teen pregnancy in US
• 750-850,000 teens between 15-19 years old become pregnant every year.– 2/3rds between 18-19 years old.– 25,000 under 15 years old.
• African American teens have highest rate– 134/1,000 vs. 48/1,1000 Caucasian teenagers
• 57% end in birth (11% of all births in US)– 14% end in miscarriage– 29% end in abortion
• 82% of those pregnancies were unintended• 86% of teen mothers remain unmarried• 35% have a 2nd child within two years
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risk factors
Physical• Sexual maturation
– 4-5 years before psychological/emotional maturation– Becoming longer as puberty starts earlier
• Brain development– Heightened activation of limbic system– Increased attraction to risky behaviors– Pre-frontal development incomplete
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Why is teenage pregnancy higher in the US?
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consequences
• SES factors– 50% of pregnancies occur in most impoverished
populations• Less opportunity for education• Less access to birth control• Reduced internal locus of control• Exposure to other risk factors
– drugs, alcohol, abuse, lack of parental monitoring• Desire for family/stability
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consequences
• Should we be concerned about this?• For teenage parents
– mother in particular• For baby• For families• For community• Methods of prevention?
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adolescent substance useadolescent substance use
• Have tried, by grade 10:Have tried, by grade 10:– cigarettes – 40%cigarettes – 40%– alcohol – 63%alcohol – 63%– illegal drugs – 38%illegal drugs – 38%
• By end of high school:By end of high school:– 17% smoke regularly17% smoke regularly– 28% recent heavy drinking28% recent heavy drinking– 40%+ tried illegal drugs40%+ tried illegal drugs
Figure 11.7
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impact of substance abuse
• Alcohol/drug abuse– Greater potential impairment in learning– More widespread brain damage– Repeated exposure may effect path and quality of
development– Due to reduction in plasticity, this damage cannot
be corrected later!• So, does this mean all experimentation with
drugs/alcohol bad?
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adolescent substance adolescent substance abusersabusers
• Compared to experimenters:Compared to experimenters:– more antisocial, impulsive actsmore antisocial, impulsive acts– start earlierstart earlier– more likely to be affected by more likely to be affected by genetic and environmental factorsgenetic and environmental factors
• low SESlow SES• family drug usefamily drug use• family difficultiesfamily difficulties• physical, sexual abusephysical, sexual abuse• poor school performancepoor school performance
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• Should we be worried about exposure to graphic violence through media?– Why or why not?
• What reasons might we have for thinking adolescents are particularly vulnerable to aggression/violence?
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social implications
• What should the social attitudes be about adolescent exposure to and involvement in high-stimulation/high-risk activities?
• Sexual Activity• Drugs & Alcohol• Violence
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identity development
• Adolescence Erickson stage of identity crisis• Identity
– Sense of individual self– Selection of commitments, beliefs, values
• Interpersonal process– Taking their place in the adult community
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cognitive changes
• Importance of conceptual structure of thinking Propositional logic: thinking constrained by logical relations
– Emphasis on rationality and scientific methodology
• Importance of conceptual resources employed in thinking
Five process: Attention, working memory, processing speed, organization, meta-cognition
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cognitive changes• Piaget’s – Formal Operational Thought
– Logical, abstract thinking
• Thinking about possibilities– “If-then” thinking– Connection between how things are and how they
might have been or could be.
• Thinking about thinking– Understanding knowledge (how/when gained)– Monitoring one’s own mental states
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relativism
• Not everything is “black and white”– Recognition of importance of perspective– Death of childish “realism/absolutism”
Can result in extreme skepticism• Rejection of authority• Rejection of cultural/social norms• Everything is “ok” – no right/wrong
Tolerance for different beliefs• Though less tolerance for actual interaction/helping
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adolescent egocentrism
• Increased introspection, self-consciousness, rationalization
• Responsible for adolescent version of egocentrism.– Imaginary audience– Personal fable– Importance of personal individuality
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• Crisis never begins: diffusion• Crisis begins –> ends with foreclosure• Crisis begins –> ends with achievement• Psychosocial moratorium
– Period of exploration• Importance in contemporary society?
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• What are some of the grounds of identity?
• Gender• Ethnicity/culture• Age group • Vocation• Political ideology• Religious/moral values
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• What is gender identity?– Function of gender roles
• Adolescence – adulthood– Gender intensification
• Social/cultural pressures• Peer pressures• Parental pressures• Biological pressures
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• What is ethnic identity?– Identification
• Physical/psychological characteristics• Cultural practices/beliefs
– Racial socialization• Majority vs. minority status• Dislocation from native lands• Cultural heritage
– Positive vs. negative identity• Assimilation vs. marginality• Bi-culturalism
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• Vocational identity– Aspect of identity associated with career.
• Being a lawyer • Being a janitor
• Religious identity– Aspect of identity associated with religious belief system.
• Being a Christian or Buddhist• Being an atheist
• Age identity– Aspects of identity associated with age group.
• Being a teenager• Being an elderly person
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Identity and stereotypes• Identities commonly incorporate/activate
stereotypes– Common characteristics associated with
• Being female• Being Native American• Being a plumber• Being a liberal
• Some characteristics positive, others negative.• Stereotype activation makes these characteristics
salient.– This can have incredibly powerful effects on behavior.
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• Gender and ethnicity stereotypes– Influence on academic performance
• When gender made salient– Females under-perform on math exams
• When ethnicity made salient– Blacks under-perform on academic tests– Whites over-perform on academic tests– Can be activated by something as simple as asking
ethnicity on demographic form!
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Effect of Recording Race (Prime for Race)
0
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Race Prime No Race Prime
Presence of Race Prime
Mea
n It
ems
Co
rrec
t
Black
White
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Effect of Stereotype Threat on Performance
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Diagnostic Non-Diagnostic
Stereotype Threat Condition
Mea
n I
tem
s C
orr
ect
Black
White
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• Clash of multiple identities• Asian females
– Baseline math performance– When gender made salient, perform less well– When ethnicity made salient, perform better
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Stereotype Threat and Math Performance
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Female Control Asian
Primed Identity
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Other effects
• When primed with racial stereotypes people were more likely to perceive a power tool as a gun.
• People primed with elderly stereotype will perceive hills to be steeper and distances longer.
• People primed with stereotype of obesity perceived people to be less intelligent, more lazy.
• Priming with gender influences perception of artistic pieces and writing.
• Priming of identity stereotypes facilitate specific interpretations of behavior.
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• Positive identity stereotypes create “uplift”• Negative identity stereotypes create “threat”• A person can have a mixture of both in their identity.• Subtle and powerful influence of our identity on our
perception, attitudes, and behaviors.