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2.01 Twin Study

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by

Mrs Goldman

on 6 May 2014

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Transcript of 2.01 Twin Study

2.01 Twin Study
What's It All About?
Their Theory
If you study separated twins, you can figure out what has more influence (is stronger),
genetic
(that’s the
nature
bit) or
environmental
(that’s the
nurture
bit) in someone’s personality (or human characteristics as the article calls them).
The Experiment
(HOW they did it = their methods)
- 50 hours of psychological and medical assessments
- Different types of psychological tests that cover different aspects (like personality traits, occupational interest (jobs), mental ability )
- Assessment of their childhood home environment
- IQ test, life history interview, psychiatric interview, and sexual life history interview

More on HOW
They made sure to SEPARATE the twins and WATCH them (supervise) while they took the test so their answers would be their own.

And they tell us that their sample size (
who
they did the study on) was all ADULT twins separated in early life and reunited as adults

So They Concluded:
“...On multiple measures of personality and temperament, occupational and leisure time interests, and social attitudes, monozygotic twins reared apart are about as similar as are monozygotic twins reared together.”

AKA that
identical twins raised apart were almost exactly the same as identical twins raised together.

Twins Reared Apart = Twins Separated at Birth
< Like the movie The Parent Trap !! >
this is rare!! No one would separate twins just for research (that would be unethical), so scientists have to FIND twins who were already separated at birth to study them
Vocab Time!!
Monozygotic and dizygotic twins = Identical and Fraternal (non-identical) twins
Article Authors
(The Citation)
Sources of Human Psychological Differences: The Minnesota Study of Twins Reared Apart
Thomas J. Bouchard, Jr., David T. Lykken, Matthew McGue, Nancy L. Segal and Auke Tellegen
Their Results
(What they Found out)
- IQ is mostly determined by genetic variation (
nature
)
- Religious interest/values is affected by rearing environment (
nurture
)
- Base physiological and psychological traits are mostly determined by
nature
--the researchers were SURPRISED that they failed to find "significant effects for cognitive abilities or personality" (or that
nurture
had very little effect)

THINK ABOUT IT!!
That means that according to their results, these scientists and researchers think that twins, who have the exact same DNA (
nature
), tend to be very much the same even if they are split up and raised by two completely different families (
nurture
)
P
S
Y
C
H
O
L
O
G
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