What explanation is given for lennies mental conditon is it accurate?

Lennie's mental condition is described as a developmental disability, likely intellectual disability or cognitive impairment. It is depicted as a realistic portrayal of someone with limited cognitive abilities, which affects his understanding of the world around him and his social interactions. While the explanation is simplified and at times stereotypical in "Of Mice and Men," it serves to highlight the challenges faced by individuals with such disabilities during the time period in which the novel is set.