![]() Furthermore, it is a symptomatic hypo- or hyper-reactive behavior (diagnostic criterion B4), with occasional visual fascination with lights or movement. In the DSM-5 (2013), Diagnostic and Statistical Manual of Mental Disorders, 5th edition, the diagnostic criterion B1, of Autism Spectrum Disorder (F84.00/299.00), has its descriptor consisting of motor movements, use of objects of inappropriate form, stereotyped or repetitive speech, echolalia and idiosyncratic phrases, and simple motor stereotypy, aligning toys or rotating objects. For Cantavella (1992), stereotypy is, in essence, a compulsive defense. In the case of Autism, the hyperexcitation of the brain results in an excess of stimuli corresponding, consequently, to the need to discharge tension through the motor escape called stereotypes or repetitive and ritualized movements. ![]() It was from Skinner's studies (1957 ) that the term operant conditioning began to be used with reference to environmental events, because functional relationships occur both between adaptive and maladaptive behaviors. Information gathering as a process is recorded in the functional assessment. Functioning problems have a functional relationship with antecedents and their consequences. These operant behaviors are positively or negatively reinforced, increasing the probability of their occurrence in the future. It is from Frederic Burrhus Skinner's studies on behaviorism that we obtain the principles to employ this conditioning. Modification of undesirable behavior or positive reinforcement of desirable behavior is achieved by differential reinforcement in operant conditioning.
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