Asperger Traits as a Conditionally Adaptive Neurocognitive Phenotype: An Evolutionary Narrative Review

: Traits historically associated with Asperger syndrome, currently included within autism spectrum disorders (ASD), include high systemizing ability, sustained attention to detail, reduced reliance on social cues, and strong cognitive perseverance. Although these characteristics are often interpreted as impairments within contemporary social environments, an increasing body of literature suggests that they may also reflect variants of human cognitive diversity with potential evolutionary relevance. This narrative review explores whether the cognitive profile commonly associated with Asperger traits can be interpreted within an evolutionary framework, integrating perspectives from evolutionary genetics, cognitive neuroscience, and developmental biology. A targeted selection of theoretical and experimental contributions was examined through full-text analysis, including models related to epistatic genetic architecture, neurocognitive network organization (including the default mode network), evolutionary behavioral strategies such as the "solitary forager" hypothesis, the extreme male brain theory, genomic imprinting models of cognition, and recent approaches investigating epistatic interactions in autism-related genetic pathways. Findings were synthesized through conceptual triangulation within a narrative review framework. Across these models, several convergent themes emerge. Traits associated with the Asperger phenotype, such as enhanced systemizing, cognitive autonomy, persistence, and technical imagination, may represent extreme expressions of cognitive strategies that could have been advantageous in certain ancestral ecological contexts. In small and variable environments, such traits may have supported technological innovation, environmental exploration, and resilience under conditions requiring independent problem-solving. Genetic evidence suggests that autism-related phenotypes arise from complex polygenic and epistatic networks rather than single-gene alterations, supporting the possibility that these traits reflect stable variants within human neurocognitive diversity. Emerging research also indicates a potential modulatory role of intergenerational epigenetic mechanisms in shaping neurodevelopmental trajectories, although these interpretations remain theoretical and should be considered with caution. Overall, the Asperger phenotype may be interpreted not solely as a neurodevelopmental deficit but as a context-dependent cognitive configuration whose functional impact varies according to environmental demands. In modern societies characterized by high social communication load, rapid relational dynamics, and sensory overstimulation, these traits may contribute to an evolutionary mismatch. However, the interaction between polygenic architecture, epistatic regulation, and potential epigenetic modulation suggests that the persistence of such cognitive phenotypes may reflect broader mechanisms maintaining neurocognitive diversity within the human population.