People with more ADHD symptoms often score lower on fluid intelligence. This paper asks what carries that gap. The candidate that holds is working memory. Processing speed does not.
The approach
Symptom scores, working memory, processing speed, and fluid intelligence are measured in the same people, and the paths between them are compared. The mediation test is the result: the intelligence deficit associated with ADHD symptoms runs through working memory.
Fluid intelligence deficits associated with ADHD symptoms