Human Grasping
Human Grasping - Related Videos
09:41
Estimation of Contact Regions Between Hands and Objects During Human Multi-Digit Grasping
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Cited by 9 •
2023
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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Cited by 7 •
2018
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.
06:54
Dissection of Human Retina and RPE-Choroid for Proteomic Analysis
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Cited by 7 •
2017
The human retina is composed of functionally and molecularly distinct regions, including the fovea, macula, and peripheral retina. Here, we describe a method using punch biopsies and manual removal of tissue layers from a human eye to dissect and collect these distinct retinal regions for downstream proteomic analysis.
16:00
Behavioral Assessment of Manual Dexterity in Non-Human Primates
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Cited by 45 •
2011
As manual dexterity is a prerogative mainly of primates, behavioral tasks have been developed in macaque monkeys. Four reach and grasp prehension tasks, measuring hand manipulation ability and force, allow to establish functional recovery after a lesion of the central nervous system and to test the effect of a treatment.
12:31
In Vivo Modeling of the Morbid Human Genome using Danio rerio
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Cited by 66 •
2013
Here, we present a systematic approach for developing physiologically relevant, sensitive and specific in vivo assays for interpreting variation in human pathology. Transient genetic manipulation via microinjection of WT and mutant human mRNA and morpholino (MO) antisense oligonucleotides harness the tractability of the developing zebrafish embryo to rapidly assay pathogenic mutations, especially, but not exclusively, in the context of human developmental disorders.
FAQs
Visual information supports advance planning by indicating an object’s location, size, and likely hand shape, while tactile feedback becomes especially important as contact occurs. Together, these signals help the hand refine finger position and adjust force during closure. This ongoing exchange allows grasping to remain stable when the object’s physical demands require more or less effort.
Grip force must match the object’s physical demands. Greater weight can require stronger support, while size affects how the fingers oppose the object and surface friction influences how easily it may slip. Adjusting force to these conditions prevents an unstable hold while avoiding unnecessary effort, making the behavior both effective and economical.
Sensory feedback continuously updates finger position and grip force as contact develops. Rather than relying only on an initial motor plan, the hand can respond to changing information about stability and the object’s demands. This correction process helps maintain control throughout the interaction and illustrates how perception and movement operate as a connected system.
Human grasping links perceptual information directly to changing motor behavior. Seeing an object helps guide hand shaping, and tactile information then supports adjustments in finger placement and force. Because each stage influences the next, the action is adaptive rather than purely preprogrammed. This makes grasping a useful behavior for studying how organisms coordinate sensing with movement.
Behavioral studies can focus on how visual and tactile information influence motor planning, hand shaping, finger position, and graded force. Examining these components together reveals how people adapt their actions to an object’s weight, size, and friction. The resulting perspective connects observable hand behavior with broader principles of motor control and perception-action coordination.
Findings about sensory guidance, force adjustment, and coordinated finger movement can inform rehabilitation strategies for restoring effective hand behavior. The same principles also support prosthetic hand design by identifying functions a device must reproduce, and robotic manipulation by highlighting the importance of adapting hand configuration and force to object properties.