Casanova has stated that most of the neurodiversity movement is based on the good intention to destigmatize autism, but some of their scientific arguments are questionable. He sees many other positives in the movement, such as the desire for acceptance and accommodations. Casanova states that the concepts behind neurodiversity originated in ancient Greek times, when Socrates attempted to determine which behaviors were a disorder and which ones were simply differences. According to him, those ideas were also seen in the Renaissance, the Romantic era, and the antipsychiatry movement. He further claims that Leo Kanner originated the modern version of the neurodiversity movement through studying autistic individuals.