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Dynamic hierarchical cognition: Music and language demand further types of abstracta

Abstract Hierarchical structures are rapidly and flexibly built up in the domains of human language and music. These domains require a tree-building capacity – “dendrophilia” – to dynamically infer hierarchical structures from sensory input (or to hierarchically structure output), based on subunits stored in a lexicon. This dynamic process involves a crucial class of abstracta overlooked in the target article.