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Lecture

PSYCH257 Lecture Notes - Posttraumatic Stress Disorder, Psychopathology, Epigenome


Department
Psychology
Course Code
PSYCH257
Professor
Allison Kelly

Page:
of 1
Model Explanation Example
Diathesis-stress model - Environmental stress
interacts with genetics
to predict mental
disorders
- Predisposing
(childhood) and
precipitating
(currently happening)
stress interacts with
genetic vulnerability
which later develops
into a psychological
disorder
- When soldiers go to
war, not all develop
PTSD.
- This is because some
do not have a genetic
predisposition toward
PTSD
- Soldiers with a lesser
genetic vulnerability
can experience the
same event without
developing PTSD
Reciprocal Gene-
Environment Model
- Environmental stress
mediates the effect of
genetics on
psychopathology
- The personality that
you grew up with
leads to stressful
situations which can
lead to psychological
disorders.
- Ex. Being shy, less
likely to be around
lots of people, leads to
developing a
psychological disorder
Epigenetics - In a stressful situation
that triggers genetic
vulnerability.
- The genome does the
work, the epigenome
decides which genes
get expressed
- Genes are turned
on/off by cellular
material outside of the
genome
- Environmental factors
influence epigenome
(passed down to the
next generation)
- Children with
adoptive parents with
schizophrenia
developed this
disorder when placed
in adoptive families
with a dysfunctional
environment
- Those children placed
in good environments
did not develop this
disorder