&gt;  deem some one being autistic without any actual developmental tests, brain imaging or even in depth psychoanalysis.<p>The latter two have nothing to do with psychiatric or psychological diagnoses. A diagnoses is made on the basis of symptoms, it doesn&#x27;t get more exact than that. There are symptoms which frequently go together, and this is how disorders get a name. Although science attempts to find biological markers for mental illness, this has not been very successful. Psychoanalysis is just pseudoscience.