So what exactly are the specific differences in executive dysfunction in AS? I apologize if this has been answered before. I missed it.
I know "executive function" is not a very precise term, although some researchers have been trying to define it more thoroughly in recent years. However, I've had the feeling that autism presents a lot of impairments that aren't specifically described in the criteria or necessarily clearly elucidated in one place, so I've been looking for something that might help identify where and how these executive function impairments might exist.
Unfortunately, the research I did find was done in 1996 and collated numerous earlier studies, so there's a lot of research since that may have an effect on their conclusions. Even so, it was rather interesting:
http://www.du.edu/psychology/dnrl/Execu ... %20and.pdfIt covers ADHD, Conduct Disorder, Autism, and Tourette's Syndrome. I focused on the autism. I can't copy/paste text from the paper itself, but the abstract says:
Quote:
In this paper, we consider the domain of executive functions (EFs) and their possible role in developmental psychopathologies. We first consider general theoretical and measurement issues involved in studying EFs and then review studies of EFs in four developmental psychopathologies: attention deficit hyperactivity disorder (ADHD), conduct disorder (CD), autism, and Tourette syndrome (TS). Our review reveals that EF deficits are consistently found in both ADHD and autism but not in CD (without ADHD) or in TS. Moreover, both the severity and profile of EF deficits appears to differ across ADHD and autism. Molar EF deficits are more severe in the latter than the former. In the few studies of more specific EF tasks, there are impairments in motor inhibition in ADHD but not in autism, whereas there are impairments in verbal working memory in autism but not ADHD. We close with a discussion of implications for future research.
What I noticed here is the verbal working memory impairment. I have tested with a very low verbal working memory, and I have been trying to figure out what it means, if anything.
This bit got my attention at the end of the paper (Implications for Future Research):
Quote:
In the two disorders (Autism, ADHD) with severe EF (executive function) deficits, both the severity and profile of such deficits is distinct for each disorder. More severe deficits relative to IQ matched controls are found in autism than in ADHD on molar EF tasks.
It would take me forever to transcribe enough, but basically: Hyperactivity and impulsiveness are characteristic in ADHD, perseveration and deficits in verbal working memory are characteristic in Autism, but there's a wide range of deficits for both.
One of the problems with the research for autistic EF deficits that they drew upon is that the majority of them did not screen anyone for whether they fit the criteria for ADHD (and the prevailing belief was that an autistic person who had ADHD just had autistic symptoms that mimicked ADHD).
I actually did not expect the paper to say that autism had more severe executive functioning deficits than ADHD, but I am not actually surprised. I would love to see more modern research on all of this.