PSYC 440 Lecture Notes - Lecture 4: Twin Study, Heritability, Psychopathology
11 Feb 2018
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Environment (events, conditions and experiences) that is common to all members of a household: non-shared environment (e2): Any experience, milieu, or circumstance that causes children from the same family to be dissimilar: how to study h2, family studies: Look for aggregation of a disorder within a family. Similarity among members may both be due to shared genetics and/or environment: adoption studies: Comparing the extent to which adoptees resemble their biological vs. adoptive relatives. People who would like to adopt children have specific characteristics. The environment is different: twin studies: Control for genetic factors (i. e. mz twins are genetically identical; dz are partly genetically identical). You can disentangle the influence of genes and the environment (i. e. understand the unique contribution). Not easy to find pairs of twins where one is depressed and the other is(cid:374)"t: molecular studies, precursors of psychopathology, effects of heritability, depression: Range from 18 (male) to 37% (female): bipolar disorder: Range from 50-60% depending on the phobia: ptds:
