To provide insight into the relationship between the motor system and mental transformations, a mental rotation task was adapted for use with young children. Specifically, 4-, 5-, and 6-year-old children were asked to match a picture of a hand shown from a palmar perspective with two comparison images of a left and right hand from the same perspective, while also holding their own hands in a similar posture. No discernible reaction time pattern emerged for the 4-year-olds. Instead of a linear increase in reaction time with angular disparity typical for mental rotation tasks, the 5-year-olds’ reaction times reflected a recapitulation of actual biomechanical movements needed to align their hands with the stimulus. In contrast, the 6-year-olds’ reaction times were only slightly influenced by biomechanical constraints and generally followed the shortest rotational path, indicating a more abstract transformation strategy. These findings are in line with the view that cognition is ontogenetically grounded in the sensorimotor system and becomes increasingly abstract with development. Importantly, the qualitative difference between age groups indicates a possible developmental shift in the underlying mechanisms of mental transformation. The study further highlights the need for age-appropriate designs to uncover the interplay between embodied processes and emerging cognitive abilities.
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