Since the earliest descriptions of moral deficit, various labels have been applied to the syndrome, each reflecting the prevailing theories of its aetiology, opinions of its cardinal features, and beliefs about the role of subtle, rather than obvious, neuropathological causes of the disorder.
When the syndrome first appeared in the modern classification schemas, the disorder was known as the hyperkinetic child syndrome (7) or hyperkinetic reaction of childhood(8) in North America. In Europe and many other countries where the International Classification of Diseases(9) is used, the disorder was known as the hyperkinetic disorder. These labels reflected the existing emphasis on hyperactivity as the cardinal manifestation of the syndrome. (19 The name of the disorder was changed to attention-deficit disorder in the third edition of the Diagnostic and Statistical Manual in 1980(11 to reflect the prevailing opinion, especially in North America, that cognitive deficit rather than overactivity lay at the heart of the disorder. (1,2) Nevertheless, a distinction between those with and those without hyperactivity was retained. In 1987, DSM-IIIR changed the name of the disorder to attention-deficit hyperactivity disorder and combined all symptoms into one unidimensional category, reflecting the then current view that inattention, restlessness, and impulsiveness were related and equivalent markers of the disorder.
This change in criteria embodied in DSM-IIIR resulted in a loss of the distinction between children who had AD-HKD with hyperactivity and those without. Since clinicians and researchers thought that this distinction was clinically relevant and scientifically valid, in 1994 (!3) the symptoms were divided once again into inattentive and hyperactive-impulsive clusters.
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Attention Deficit Disorder or ADD is a very complicated, and time and again misinterpreted, disorder. Its beginning is physiological, but it can have a multitude of consequences that come alongside with it. That apart, what is the differentiation between ADHD and ADD ADHD is the abbreviated form of Attention Deficit Hyperactive Disorder, its major indications being noticeable hyperactivity and impulsivity.