In psychology:
dif ways of viewing the same behaviour
higher levels are more complicated (holistic), lower levels are more simple (reductionist)
all behaviours can be viewed from any of the levels
highest level: explanations of behaviour from a social and cultural perspective e.g. traditions, norms, rules ect
middle level: explanations of behaviour from psychological perspective e.g. cognitions, learning, psychodynamic etc
lower level: explanations of behaviour from a bio perspective e.g. gene, neurochemistry ect
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