The flamboyant behaviour and the restless pursuit of romantic opportunities in cyclothymia suggest the hypothesis that its constituent traits may have evolved as a mechanism in sexual selection. Even their creative bent—in poetry, music, painting, or fashion design—may have evolved to subserve such a mechanism. Cyclothymic traits appear to lie on a polygenic continuum between excessive temperament and manic depression. Indeed, clinically identified cyclothymes have patterns of familial affective illness, as one would expect for a forme fruste disorder/79)
Cyclothymia has also been observed in the offspring of manic-depressive probands, with onset in the postpubertal period. (92> Finally, family studies of patients with a bipolar disorder have revealed an excess of cyclothymia.(97) Hypothetically, this temperament might represent one of, if not the most important, inherited trait diathesis for bipolar disorder. For instance, moody-temperamental individuals are over-represented in the 'discordant' monozygotic co-twins of manic-depressives. (98> Alternatively, and in a more theoretical vein, manic-depressive illness might be the genetic reservoir for the desirable cyclothymic traits in the population at large.
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Autism is a developmental disorder that manifests itself in early childhood and affects the functioning of the brain, primarily in the areas of social interaction and communication. Children with autism look like other children but do not play or behave like other children. They must struggle daily to cope and connect with the world around them.