As if the debates described above were not enough, there are a number of theories somewhere on the spectrum from the radical to the ridiculous. Below are some examples of ideas that are not generally accepted by palaeontologists but that do occasionally circulate.

Some studies indicate that Neanderthals may have had considerably longer lifespans than humans. This is not widely accepted, as it is based upon the assumption that rates of maturation in Neanderthals are very similar to those in Homo sapiens. Specifically, ages are calculated according to tooth wear and this is then correlated to maturity of the specimen in terms of height, development, etc. The conclusion is that Neanderthals took longer than sapiens to reach maturity, and thus that their lifespan must have been correspondingly longer. Almost every stage of this line of argument is contentious, and it is highly notable that no Neanderthal remains of individuals with an apparent age greater than around 40 years have been found.

Creationists, naturally, contend that Neanderthals are fully modern humans, often arguing along the lines of Virchow’s discredited theory that the differences between Neanderthals and sapiens are caused by injuries and pathologies. The sheer quantity of Neanderthal remains now known make it difficult to conceive of all individuals suffering the same injuries, and means that palaeontologists universally reject this idea.

Finally, it has been proposed that the related group of neurological disorders that include autism, Asperger’s syndrome, dyslexia and attention deficit hyperactive disorder (ADHD) may be due to the presence of Neanderthal genetic material, rather than mis-functioning genes. Supporters of this theory draw parallels between the symptoms of autism and deduced behaviours of Neanderthals: dispraxia (lack of hand-eye coordination) compared to absence of Neanderthal throwing weapons; seasonal affected disorder (SAD) may indicate Neanderthals hibernated; autistic children typically have a slightly larger brain; and difficulty in learning a language. They also note that autism is more common among people of European descent, who would be expected to have more Neanderthal genes than those of purely African or Asian descent. Opponents point to the circumstantial nature of this evidence, maintain that there are many symptoms of autism that are not explained in this way, and object to the assumptions made (there is no direct evidence to support the idea that Neanderthals hibernated outside of the Neanderthal theory of autism, and Neanderthals may well have had a language).

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1 Homo erectus was another relative of both Homo neanderthalensis and Homo sapiens.
2 With the possible exception of the disputed taxon Homo floriensis, known to the popular media as ‘hobbits’.
3 ‘Hominin’ is the term used for all humans, living and extinct. ‘Hominid’, formerly used for humans, has now been widened to include apes. It is now possible that Neanderthals may have been driven extinct by terminal confusion about their own identity.