It is important to note that IQ scores can vary depending on various factors, including testing conditions, mood, motivation, and attention levels during the testing. Additionally, IQ tests have their limitations and may not fully capture a person's true intellectual abilities.
For individuals with ADHD, their symptoms can affect their performance on tasks that require sustained attention, focus, and concentration, which are essential components of most IQ tests. Without ADHD medication, it's possible that someone with moderate ADHD might struggle to maintain focus during the test, leading to a lower IQ score.
When the same individual takes the IQ test while on ADHD medication, the medication may help improve attention, focus, and cognitive functioning. As a result, they may perform better on the test, potentially leading to a higher IQ score compared to when they were unmedicated.
So, it's plausible that an individual with moderate ADHD could score differently on an IQ test depending on whether they are taking ADHD medication or not. The 20-point difference between the IQ scores you mentioned is not uncommon in such cases, though actual variations might differ from person to person.
It's essential to remember that IQ scores are not the sole measure of a person's intelligence or capabilities. They represent a particular snapshot of cognitive abilities at the time of testing and may not reflect someone's full potential or talents. Furthermore, treating ADHD with medication can be helpful for some individuals in managing symptoms, but it's only one part of a comprehensive approach that might include other strategies, support, and accommodations tailored to the individual's needs.