Exam 3 Flashcards
Puberty
sexual maturation becomes evident
- biologically capable of becoming parents
- greatest period of sexual differentiation since interuterine life
- onset different for girls and boys
- girls begin with growth spurts at about 10.5
- boys begin a growth spurt at 12.5
- the path may be different for intersex conditions
Puberty in folks with female sex traits
girls: range of start (8-13 yrs)
- early signs
- breast development - breast budding
- growth spurt- height and weight
- pubic hair development
- menarche (12.8 yrs) very first period
- generally no mature ova are produced
Puberty education in school
video places emphasis on hygiene
rather than education of what is actually going on
Puberty in folks with male sex traits
boys range of start (9.5-13.5 yrs)
ealry signs
enlargement of testes, penis
pubic hair development
growht spurt (muscle development)
Spermarhce (around 13)
first ejaculation, although semen has few living sperm
Psychological impact of timing of puberty
3 times, early, late, on time
not necessarily a period of storm and stress
research doesn’t back up stress and anxiety increases for all adolescence
individual changes, moving, divorce, global pandemic
but if it’s ob time with peers is best
there are gender differences in impact and timing of puberty
Early puberty for girls
girls
below average popularity
withdrawn
lacking self confidence
stressed
poorer body image
higher risk eating disorders
early sexual debut
early puberty in boys
seen as relaxed, independent, self confident, popular
attractive
good body image
leaders -athletes
Late puberty in girls
regarded as physically attractive
lively
-sociable
leaders
good body image
Late puberty in boys
viewed as anxious
overly talkative
attention seeking
poor body image
Which is worse?
early girls, leads to most body related disorders, most common/problamatic
Earlier puberty in boys
2012 AAP
- boys pubertal development was 6 months to 2 years earlier than data several decades ago
- boys NON hispanic, white, 10.4 years
- boys non hispanic African american, 9.14 years
- boys hispanic 10.4 years
Causes of earlier puberty
changes indiet
obesity in girls (body fat stores estrogen)
possibly environmental toxinc, EDC
changes in sleep
—erratic sleep patterns
more blue screen exposure
changes in medical care
family structure
media - very sexualized
Is early puberty bad?
physical consequences
prolonged exposure to estrogen
more exposure increase adolescent
psychological consequences
judged on appearance, judged as older, than they are, teased, maturity not liked to appears
What can parents do?
breastfeed baby
push for earlier puberty education in schools
don’t disparage there bodies “im so fat”
Ellis and Garber (2000) - consequences of early puberty
physical
- higher rate of breast cancer
- obesity
- teenage pregnancy
psychological
- more body image disturbance
- more emotional problems
- more “problematic” behavior
Ellis and Garber- past literature explores biology
monozygotic (identical), twins average difference in months
reared together 2.8 months in getting period
reared apart 9.3 months
Dizygotic (fraternal) twins average difference in months
reared together 12 months apart getting period
Interpreted
something is going on environmentally
difference between together and apart
something about environment can push puberty around
Belsky, Steinburg and Draper
proposed an evolutionary model of reproductive effort
model rests on bilogically asesses
availability and predictability of resources
trustworthiness of others
enduringness of close personal relationships
if environment is it may be adaptive to reproduce earlier
Girls and environmental relationships
causes
- family stress
- lack of resources
- father absence
- coercive relationships
- lack of family support
effects
- accelerates puberty
- accelerates sexual behavior
- orients towards unstable relationships
Hyptotheses
history of mood disorders in mom will predict early puberty
higher family stress will predict ealry puberty
girls from father absent homes will experience puberty earlier
amount of time with unrelated males –> ealry puberty
Method
short term, longitudinal study
mother completed questionares
daughters completed surver of pubertal states
97 families, 47 father absent
All hypotheses were coreect
find-out related to famlily structure very shocking
Boys? - james, ellis, schlomer and garber 2012
looked at boys and girls
risk taking, family stress, percieved mate value
father absence = early puberty in girls not bous
risk taking, percieved mate value = early for girls and boys
Ellis and Diel Guidance, 2019
comfortable, childhood, low stress, delayed puberty
Pandemic: Verzani et al (2021)
found earlier puberty for girls
medically referals for early puberty
2020 = 206 patients, 2019- 118 patients
increased 108%
boys 9 in 2020, 6 in 2019
changes in diet during pandemic
blue screen exposure
reported changes in stress level
pandemic contributed to ealry puberty
Life history theory
organisms face trade offs facing development constraints
this has been applied to pubertal timing particularly in girls
Moral development
has an emotional component
has a behavioral component
cognitive component - planned cheating