Disentangling Representations of Object and Grasp Properties in the Human Brain

摘要: The properties of objects, such as shape, influence the way we grasp them. To quantify role different brain regions during grasping, it is necessary to disentangle processing visual dimensions related object from motor aspects specific hand configuration. We orthogonally varied (shape, size, and elongation) task (passive viewing, precision grip with two or five digits, coarse digits) used representational similarity analysis functional magnetic resonance imaging data infer representation configuration in human brain. found that elongation most strongly represented feature grasping coded preferentially primary cortex well anterior posterior superior-parieto-occipital cortex. By contrast, somatosensory, motor, ventral premotor cortices number digits while ventral-stream dorsal-stream a mix dimensions. features modality, was less relevant passive viewing than grasping. summarize, this study shows particularly property grasp, which along used, within both parietal regions, suggesting communication between streams about these might be execution efficient actions. SIGNIFICANCE STATEMENT something, an guide preshaping into appropriate Different grips can objects require configurations. However, natural actions, type are often confounded, few experiments have attempted separate them produced conflicting results. As such, unclear how across Here manipulated grip, revealed dimension (object (number more dorsal streams. These results suggest play visuomotor coding essential for