11/07/2019
AACN's Ask the Experts Series
What is the role of neuropsychology in diagnosing ADHD?
By Wendy B. Marlowe, PhD, ABPP
Since October was ADHD awareness months, it is a good time to talk about the role of the neuropsychologist in assessing attention deficit hyperactivity disorder.
Although some people think that anyone with fidgety behavior and distractibility has attention deficit disorder or attention deficit hyperactivity disorder, and many people take online rating scales to self-diagnose ADHD, the actual diagnosis is more complex.
Attention deficit hyperactivity disorder (ADHD) is a constellation of symptoms, the most prominent of which are inattention, over activity and impulsivity. The Diagnostic and Statistical Manual-5 describes a combination of symptoms that can result in an ADHD diagnosis. The number of symptoms required to meet the criteria depends on the age of the person, with more characteristics required in children.
The criteria for inattentive behavior include making careless mistakes, not listening, avoiding tasks that require mental effort, losing things, and being distractible or forgetful. The criteria for hyperactivity relate to being fidgety, overactive, having trouble sitting still, difficulty waiting for one’s turn, and interrupting. The symptoms must occur across multiple settings and interfere with daily functioning. The tricky part of the criteria, and that aspect that really requires the expertise of a clinical neuropsychologist, relates to the symptoms not being better explained by another mental disorder.
The symptoms are not totally specific or unique to ADHD. Any of us can be distractible or inattentive if we are preoccupied with worries or fears, anxious, hungry or sleepy. In addition to alcohol, many other recreational drugs, as well as prescription medications may cause drowsiness or inattention. These same factors may lead to impulsivity. If we are preoccupied for any reason, we may not take the time to consider consequences before an impulsive act. There are a number of other kinds of mental disorders, such as anxiety, mood disorders (depression, bipolar disorder, disruptive mood dysregulation disorder) or personality disorders that are characterized by many of the same symptoms/behaviors seen in ADHD.
Neuropsychologists are generally careful health care providers. We do our best to provide an accurate diagnosis, and recommendations for intervention or treatment. We take a thorough history in order to understand your past background and how long these symptoms have persisted. Generally, ADHD develops in early childhood, whereas other disorders may occur at a later point in time. We undertake a comprehensive evaluation that involves all areas of thinking, behavior and performance for two primary reasons.
First, there are many other disorders with similar symptoms that need to be carefully considered before reaching the diagnosis. Second, ADHD is rarely “pure” and may be part of a co-occurring disorder, such as a learning disability or a more generalized disorder of executive functions. People with ADHD are also at risk for psychiatric disorders involving mood, personality and often substance abuse.
A comprehensive neuropsychological assessment, in the hands of a well-trained and skilled neuropsychologist, will not simply rule in/rule out ADHD. A comprehensive neuropsychological evaluation will identify those factors or behaviors that are interfering with competence and successful functioning, and provide recommendations for improvement or amelioration.
Image credit: https://pixabay.com/photos/sad-learning-school-reading-544730/