5.1 Autism in families
As you learned in Week 1, twin studies provide evidence for a strong genetic factor in autism. When one twin of a pair is on the autism spectrum, the chance of the other twin also being on the spectrum (known as
Even in non-identical twins or in siblings, concordance for autism is higher than in the neurotypical population. Twin and sibling concordance findings together suggest that autism can be passed down (inherited) from one generation to another, and affect multiple members of the same family. This was illustrated in video clips in Week 3: brothers Acis and Harry and their grandfather John are all on the autism spectrum.