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Biological Approach

All that is psychological is first physiological ­ that is, sine the mind appears to reside in the brain, all
thoughts, feeling and behaviours have an ultimately physical/biological cause


1. Physiological processes: these affect behaviour, mood and cognition
2. Genes: these can affect behaviour
3. Behavioural contiguity:…

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o MZ desirable, however, they share very similar environments
o Useful to study MZ reared apart
Bouchard et al. (1990) found more concordance with intelligence for MZ
(compared to DZ)
Adoption studies
o Useful to compare a trait (e.g. schizophrenia) of adopted children with their
biological and adoptive parents


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