PSYCHOSOCIAL MENTAL RETARDATIONS
\sˌa͡ɪkə͡ʊsˈə͡ʊʃə͡l mˈɛntə͡l ɹɪtɑːdˈe͡ɪʃənz], \sˌaɪkəʊsˈəʊʃəl mˈɛntəl ɹɪtɑːdˈeɪʃənz], \s_ˌaɪ_k_əʊ_s_ˈəʊ_ʃ_əl m_ˈɛ_n_t_əl ɹ_ɪ_t_ɑː_d_ˈeɪ_ʃ_ə_n_z]\
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Subnormal intellectual functioning which originates during the developmental period. This has multiple potential etiologies, including genetic defects and perinatal insults. Intelligence quotient (IQ) scores are commonly used to determine whether an individual is mentally retarded. IQ scores between 70 and 79 are in the borderline mentally retarded range. Scores below 67 are in the retarded range. (Joynt, Clinical Neurology, 1992, Ch55, p28)
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