1. Asperger syndrome has only been known about in the English speaking world since around 1994 or 1995, so it is a relatively new condition that is still not fully understood. No evidence exists that the condition would be co-discovered if Hans Asperger's paper wasn't translated from German to English in 1991. Conversations with people who are knowledgeable about Asperger syndrome – including clinical psychologists – have revealed to me that official reports and references to Asperger traits in medical and educational publications (remember that GPs and teachers are usually first in line to encounter children with undiagnosed Asperger syndrome before psychologists are) are very few and far between before the 1990s so the pieces of the puzzle were not falling into place back then. It could be argued that the development of the internet in the late 1990s would have enabled people with, or parents of children with, (undiagnosed) Asperger syndrome to share information and experiences, ultimately leading to the condition being co-discovered around 2000ish.
2. The failure of the medical and educational community to pick up on Asperger traits in the 1970s and 1980s points to it being a very rare condition back then. Since 2005ish Asperger syndrome has become an officially recognised condition in the educational and medical communities, and a reasonably well known condition amongst the general public, with countless books and articles published on the subject. There are no accurate figures for how many people have Asperger syndrome but I was verbally informed by an educational psychologist that almost every primary school in England has at least one kid diagnosed with Asperger syndrome.
3. If Asperger syndrome is genetic then the percentage of people with Asperger syndrome (diagnosed or undiagnosed) today should be almost identical to that from the 1970s and 1980s. If Asperger syndrome is not genetic then the percentage of people with Asperger syndrome (diagnosed or undiagnosed) today could be significantly higher than that from the 1970s and 1980s.
4. There have been many changes in the education system and parent’s attitudes to school since the early 1990s. A much higher proportion of parents place a stronger emphasis on academic prowess before KS4 rather than just letting their children muddle along, enjoy school, work hard, and behave well which was usual in the 1970s and 1980s. The explosion in the number of books, videos, and software about primary school level English, maths, and science on the market along with the never ending demand for private tuition is a testimony to this. This raises a question as to whether pushing kids academically is detrimental to their social development and a root cause of (the rise of) Asperger syndrome. Has any serious research taken place into children with Asperger syndrome who come from very non-academic families? I have received unreliable and unverified information that children with Asperger syndrome who come from large council estates who’s parents have not bothered much with education prior to starting school are extremely rare.
5. Almost all studies into Asperger syndrome (published in English) has been by (white?) culturally British or American people using culturally British or American people as their subjects. Far less research has been carried out into people of culturally foreign backgrounds, or follow religions other than Christianity or Judaism, in the UK or the US. Therefore it is far less clear how Asperger syndrome manifests in such people with a different cultural background or social expectations. My own experience of the NAS is that it is dominated by white, British, socially conservative, middle class people from the suburbs and the shires. The NAS superficially claims to uphold an inclusive and multicultural society but in reality it has a generally poor knowledge of foreign cultures and non-Christian religions.
6. There are questions as to whether the occurrence of people with Asperger syndrome is equal throughout different races and nationalities or whether it is more commonplace in some races and nationalities than others. The NAS insists (without real evidence) that Asperger syndrome occurs equally in different races but it has been noted many a time at more local levels, and even amongst psychologists, that it is very uncommon amongst black children and young adults in Britain, around amongst south Asians, and most common of all amongst those of white British origin. There is no reliable information for Chinese, eastern European, and smaller ethnic groups - such as Turkish or Middle Eastern.
7. I have wondered if there are differences in Asperger syndrome in the UK and the US due to differences in society, culture, the education system, and social expectations between the two countries. I read somewhere that the US has some of the most complex, illogical, opaque, and unapparent social rules of any nation on earth. It’s a country where even mere survival requires the ability to read people and pick up social cues then respond appropriately to a higher degree than in most other countries. It is notable that the world is awash with social skills books and the vast majority of English language ones are written by Americans presumably for Americans or immigrants to the US. How common are social skills books in languages other than English for countries other than the US? A similar American bias applies to books about Asperger syndrome although there are some good British titles.
8. It is possible that there are undiscovered psychological conditions / pervasive developmental disorders that produce temporary or medium term Asperger syndrome like symptoms (a few years?) that eventually self cure or can be completely cured with the right help and support. This could explain why people officially diagnosed with Asperger syndrome have manage to cure themselves of it.
9. Psychology – like all social sciences - is not an exact science and is a science in a state of flux. At one time homosexuality was officially recognised as a mental health disorder.