Kanner's early descriptions of autism noted which of the following traits?

• A. Hyperactivity and impulsiveness
• B. Muteness and superior rote memory skills
• C. Social extroversion and vivid imagination
• D. Cognitive delay and physical disability

Answer: (B)

Kanner's early descriptions of autism emphasized specific behavioral traits that characterized individuals on the spectrum. Notably, he observed that some children exhibited muteness, meaning they had limited or absent verbal communication skills. Additionally, he noted that these individuals sometimes demonstrated superior rote memory skills, which refers to the ability to recall information or perform tasks without necessarily understanding the underlying concepts. This combination of a lack of spontaneous speech or interaction alongside impressive memory abilities formed an essential part of Kanner's initial understanding of autism.

The other traits mentioned in the choices do not align with Kanner's descriptions. Hyperactivity and impulsiveness, for instance, were not focal points in his early writings. Similarly, social extroversion and vivid imagination do not fit Kanner’s observations, as he focused more on social withdrawal and restricted play behaviors. Lastly, cognitive delay and physical disability were not definitive characteristics of his conceptualization of autism, as he recognized that individuals with autism could possess a range of cognitive abilities, including above-average intelligence in certain areas. Thus, the emphasis on muteness and superior rote memory skills is what Kanner specifically highlighted in his foundational work on autism.