What Is ADHD?

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Attention deficit hyperactivity disorder (ADHD) is one of the most common disorders diagnosed among children in the United States (Lynch, 2013). Its growing prevalence in the United States is becoming a major controversy in the field of Psychology. The public seems to have an opinion as well. Should we be treating children with …
Background of ADHD
The history of children with hyperactivity and intention is very dense. The diagnosis of ADHD has grown and changed a lot over the years, but the story of ADHD begins in 1798 (Lange et al., 2010). Sir Alexander Crichton was a medical doctor from Edinburgh who became an expert on mental illness. In the second of his books about mental illness, he wrote about attention disorders. He described people who are unable to focus or pay attention with the necessary amount of consistency (Lange et al., 2010). The distractibility of these individuals and the fact that the disorder is “born with a person” are two other similarities that his description have with the modern understanding of ADHD (Lange et al., 2010). Sir Alexander Crichton started the conversation that turned into the diagnosis of ADHD, but he the definition of the disordered changed a lot through history.
The next major contributor to the modern diagnosis of ADHD was Heinrich Hoffman and his stories about “Fidgety Phil” (Lange et al., 2010). In 1844, Hoffman described a child who misbehaved regularly, didn’t listen to his father, and couldn’t sit still (Lange et al., 2010). These symptoms are still part of the DSM diagnosis of ADHD today. His work introduced the public to the idea of a ADHD-like child that isn’t inherently a bad kid.
Sir George Frederic Still (1868-1941), “the father of British pediatrics”, is known a...

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... and 10.0 mg/kg in sequential order. The behavioral test only occurred after the second injection of methylphenidate per day. The lever pressing data from last day (how many days?) of each dose will serve as the data point. After the drug phases, abstinence will be introduced and behavioral data will be collected again.
Research Question
Will behavioral tolerance occur with acute and chronic exposure to methylphenidate?
Behavioral tolerance will occur; the response rate of the rats before and during the drug insult will produce more frequent reinforcement (more adaptive behavior) than after abstinence is introduced.
Data Analysis
This is a within subjects repeated measures design where each animal will receive each level of the independent variable and will serve as its own control. The data will be analyzed with a one-way within-subjects anova.
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