Voluntary Grasping
Voluntary Grasping - Related Videos
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When we grasp an object, multiple regions of the fingers and hand typically make contact with the object's surface. Reconstructing such contact regions is challenging. Here, we present a method for approximately estimating the contact regions by combining marker-based motion capture with existing deep learning-based hand mesh reconstruction.
10:51
Frame-by-Frame Video Analysis of Idiosyncratic Reach-to-Grasp Movements in Humans
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This protocol describes how to use frame-by-frame video analysis to quantify idiosyncratic reach-to-grasp movements in humans. A comparative analysis of reaching in sighted versus unsighted healthy adults is used to demonstrate the technique, but the method can also be applied to the study of developmental and clinical populations.
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11:34
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FAQs
Visual information is converted into a motor plan that specifies where the hand should travel and how the fingers should be arranged. Information about location supports hand transport, while size and shape guide finger shaping. This coordination links perception to action rather than treating vision and movement as separate processes, making grasping useful for studying sensorimotor integration.
Contact does not end the control process. Once the hand meets the object, the nervous system adjusts the force used to secure it. This contact-related correction shows how voluntary grasping combines advance planning with ongoing sensorimotor control. Researchers can therefore examine how movement is organized before contact and refined as interaction with the object unfolds.
Attention and action selection influence which visually available object becomes the target of movement. Decision-making determines whether an intended grasp is initiated, while motor planning organizes its execution. Studying these links helps psychology connect an observable hand action with less visible processes, including selecting an action and integrating object information with the planned response.
Research can focus on the relationship between perceived object properties and resulting behavior. Investigators examine how information about location, size, and shape corresponds to hand transport, finger shaping, and force adjustment at contact. This approach connects what a person perceives with how the action is organized, rather than considering hand movement independently from perception and decision-making.
Changes in reaching and securing objects provide a behavioral context for examining motor development and neurological impairment. Because the task links perception, planning, and movement, it helps researchers frame questions about how coordinated action develops or how impairment affects sensorimotor behavior. The resulting observations can identify which aspects of perception-action coordination require further study or support.
The principles revealed by voluntary grasping clarify how people translate perceived object properties into controlled hand actions. That knowledge is relevant to research on human-computer interaction and rehabilitation, where coordinated movement and sensorimotor behavior are important concerns. Its value comes from connecting observable performance with perception, decision-making, hand movement, and force control.