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Asperger Syndrome Vs. High-Functioning Autism Asperger Syndrome Vs. High-Functioning Autism Asperger Syndrome vs. High-functioning Autism Asperger syndrome (AS) is one of several pervasive developmental disorders (PDD), which presents itself very similarly to high-functioning autism (HFA). Hans Asperger first discovered the condition in 1944, but it was only uniquely recognized in standard classification models in 1994..