this could allude to an injury that Stevenson does not write in the short story. Furthermore, this case of "unilateral brain damage" could simply refer to the repression suffered by Dr. Jekyll. The Victorian era recognized the left side of the brain as the logical side, that of reasoning and speech. The left hemisphere was often “associated with masculinity, whiteness, and civilization” (Stiles 884). Dr. Jekyll displays all the qualities of the left hemisphere: masculinity, whiteness, logic, intelligence, and humanity (Stiles 885). Conversely, the right side of the brain controlled emotions, deeming it feminine and “only for women” (Stiles 884-85). This side of the brain had some exceptions to femininity (showing great gender bias), which is strange while Dr. Jekyll relies so much on his left brain that when he suddenly starts using the right, the scale is too far off. “cure” inadvertently creates his mental illness and criminality (Stiles 887) At the time of his confession, Jekyll says, “I was conscious of no repugnance, rather of a start of welcome, that too was me-.” same. Stevenson 88). This statement is rather heartbreaking because Jekyll was simply looking for a way to end his misery. When Dr. Jekyll cannot reverse his "cure" at the behest of the good, law-abiding man, he commits an act of "self-healing." destruction by drinking a poisoned vial to avoid capture and the legal and social condemnation that follows” (Sanna 35-35). In terms of the dissociation of Jekyll and Hyde, whatever the cause, the theory of dualism comes up repeatedly. “a thought according to which facts about the world in general or about a particular class can only be explained by ultimately assuming the existence of two different, often opposed and irreducible, principles” (Singh). Henry Jekyll, an esteemed physician with a brilliant intellect, is all too aware of “the duplicity of the life he leads and the evil that resides within him” (Singh). Jekyll discusses his thoughts on duplicity in his work. Jekyll says: “Every day, and on both sides of my intelligence, moral and intellectual, I thus gradually approached this truth, by the partial discovery of which I was doomed to such a terrible thing. shipwreck: this man is not really one, but really two” (Stevenson 83). Jekyll thinks he will enjoy both changes without any reaction; however, Hyde soon becomes more powerful than his "good" alter and ultimately leads Dr. Jekyll to his downfall (Singh). Stevenson creates a coexistence in Dr. Jekyll and Mr. Hyde to constitute a “normal” individual (Singh). Looking at things as Jekyll did, "Humans are half good, half bad", Stevenson separated the two, making pure good (Jekyll) and pure evil, as Jekyll says: "Edward Hyde, alone in the ranks of humanity, was pure evil” (Stevenson 88). After all, good and evil are independent objects, persons; they possess distinct psychological characteristics and constantly fight with each other