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These include heightened, enhanced sensitivity to the rules of grammar (morpho-syntax), often resulting in hyper-systemizing, as well as rigidity interpreting metaphorical, non-literal language. Human cognition and behavior (including language) believably resulted from an intense feedback loop between an increase in cognitive flexibility (primarily through a gradual emergence and complexification of language\/grammar) and a reduction in reactive aggression and impulsivity (this resulting in more prosocial behaviors). Neurobiologically, this feedback loop contributed to a relatively recent evolution of denser connectivity between some cortical structures and the striatum, which is found affected in ASD. In this paper, we propose that the seemingly disparate features of ASD, including linguistic and behavioral rigidity, result from a common cause: an enhanced striatal function, linked to a reduced control of the striatum by selected cortical structures. The striatum is associated with both impulsiveness (including reactive aggression) and with automated, rigid, ritualized responses. 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