The dual-stream model borrows vision's what/where logic

The dual-stream model of language processing, developed by Hickok and Poeppel, adapts the visual system's division into a 'what' (object identification) and 'where' (localization) pathway, positing one stream that maps sound to meaning (structure and content) and another that maps sound to articulation (motor output), because sub-specialized circuitry optimized for each problem is an efficient engineering solution the brain reuses.