Historical clue formulations

• Condition that exists on a spectrum — 2023-04-18
• Special-education challenge — 2018-03-09
• Condition for filmdom's Rain Man — 2018-02-04
• Asperger's is a form of it — 2015-02-20
• Psychologist's study — 2005-07-03
• Psychiatric disorder — 2001-11-18