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...s the study of mental illness. Psychologists may study how drugs or other chemical agents [[affect]] the brain, but generally are not trained to prescribe or ...ated illnesses grew. Many conditions have been linked to [[biological]] or chemical abnormalities in the brain's psychology, but for some conditions the [[etio

...y." (Lévi-Strauss 1987: 59) This sudden emergence, however, introduces an imbalance between the two orders of the signifier and the signified: since the signif ...the term gets gradually richer (say, with modern science, we discover the chemical composition of water, H2O), "the reference is constant":