Grasp
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For newborns, grasping is a natural reflex.

A grasp is an act of taking, holding or seizing firmly with (or as if with) the hand. An example of a grasp is the handshake, wherein two people grasp one of each other's like hands.

In zoology particularly, prehensility is the quality of an appendage or organ that has adapted for grasping or holding.

Grasping is often preceded by reaching, which is highly dependent on head and trunk control, as well as eye control and gaze.[1]

Development

[edit]
Grasp reflex of a 5-month-old baby boy

The development of grasping is an important component of child development stages, wherein the main types of grasps are:

  • Raking grasp, wherein the fingers, but not including the thumb, do all the holding.[2]
  • Palmar grasp, wherein the fingers squeeze against the palm, instead of against themselves as in the raking grasp.[2] Children are usually able to use a palmar grasp by the age of 6 months.[3][4]
  • Pincer grasp wherein the pointer finger and the thumb squeeze to grasp an object.[2] Children are usually able to use a pincer grasp by the age of 9 to 10 months.[3][4]

Infants reach as early as 16 weeks of age and are able to perform certain actions that lead to grasping objects. The act of grasping is a two-stage motor skill that develops. The first stage, infants will reach out towards the desired object. In the second stage, the infants will then clench fingers once the object has made contact with the palm and close. Infants try to grasp an object before it is within reach by initiating arm and hand movements. The child will extend their grip more than necessary because their perception is less developed than an adult's grip.[5] Infants progress their grasping skills throughout time by practice and providing objects that are reachable. It is essential to provide infants with objects they can grasp in order to progress and further their development of the grasping skill; exposing infants to new objects to practice grasping will overall benefit this primitive motor skill and elevate the associated cognitive process.[6] Infants develop their reaching and grasping from making just contact with their hands, to using their palms to contact an object. Infant grasp is an extension of reaching and develops between six and nine months of age. Stable patterns of reaching in order to grasp continue to develop as the child grows and matures. By the age of 6, children are now learning hand placement on the writing utensil the correct way.[7]

Types of hand movements

[edit]

Hand grasps can be grouped into taxonomies according to qualitative and quantitative properties, leading to specific clusters of movements.[8] In terms of synergies, there are three categories of hand movements. Simple synergies are present, when all the components of the hand are moving in a similar pattern. Conversely, it is called reciprocal synergies, when the fingers or thumbs are working in different patterns. Finally, sequential patterns are specific hand movements performed in a specific order.[9] Synergies are fundamental for controlling complex hand movements, such as the ones of the hand during grasping. The importance of synergies has been demonstrated for both muscle control and in the kinematic domain in several studies, lately on studies including large cohorts of subjects.[10][11][12]

Reflex

[edit]
Main article: Palmar grasp reflex

The palmar grasp reflex (sometimes simply called grasp reflex) is among the primitive reflexes and appears at birth and persists until five or six months of age.[13] When an object is placed in the infant's hand and strokes their palm, the fingers will close and they will grasp it. The grip is strong but unpredictable; though it may be able to support the child's weight, they may also release their grip suddenly and without warning. The reverse motion can be induced by stroking the back or side of the hand.

References

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Grasp

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A grasp is the coordinated action of the human hand in which the fingers and opposable thumb contact and enclose an object to hold or manipulate it securely. This essential motor function enables everyday activities such as tool use, writing, and object transport, relying on the hand's intricate anatomy—including 27 bones (8 carpals, 5 metacarpals, 14 phalanges), over 30 muscles, tendons, and ligaments—for precise control and strength.[1][2] Neural mechanisms in the brain, spinal cord, and peripheral nerves coordinate these movements, allowing adaptation to object shape, size, and texture.[3] Grasps are typically classified into power grasps for robust enclosure of larger objects and precision grasps for fine manipulation of small items, following taxonomies like that of Cutkosky which categorize over a dozen variations based on contact points and opposition types.[4] Developmentally, grasping emerges from innate reflexes in newborns, progressing to voluntary skilled actions by early childhood. Impairments in grasping, often due to neurological disorders, stroke, or injury, can significantly affect independence, with therapeutic interventions focusing on rehabilitation and adaptive aids.[5]

Anatomy and Physiology

Hand Structures for Grasping

The human hand's skeletal framework consists of 27 bones, including eight carpal bones forming the wrist, five metacarpal bones in the palm, and 14 phalanges in the fingers. The carpal bones, arranged in proximal and distal rows, articulate with the radius and ulna proximally and with the metacarpals distally at the carpometacarpal (CMC) joints, providing stability and flexibility for hand positioning. The metacarpals connect to the phalanges at the metacarpophalangeal (MCP) joints, while the phalanges form proximal interphalangeal (PIP) and distal interphalangeal (DIP) joints, enabling flexion, extension, and opposition essential for grasp formation.[6] Finger positioning during grasps relies on both intrinsic and extrinsic muscles. Intrinsic muscles, such as the four lumbricals and seven interossei (four dorsal and three palmar), originate within the hand and fine-tune movements by flexing the MCP joints while extending the interphalangeal joints, creating a balanced, sweeping motion that increases the fingertip-to-palm distance for secure object enclosure. Extrinsic muscles, including the flexor digitorum superficialis and profundus for flexion and the extensor digitorum for extension, originate in the forearm and provide the primary force for powerful finger curling and release, with lumbricals attaching to flexor tendons to coordinate these actions.[7][8] The thumb's opposable structure, facilitated by the saddle-shaped CMC joint between the trapezium carpal and the first metacarpal, allows a wide range of motion including flexion, abduction, and rotation, enabling the thumb pad to contact the other fingers directly. This joint, supported by robust ligaments and larger intrinsic thumb muscles like the opponens pollicis, permits precision opposition critical for manipulative tasks. Evolutionarily, this adaptation emerged in early hominins around 3.2–3.5 million years ago, as evidenced in Australopithecus afarensis fossils, enhancing tool use through secure power and precision grips that improved hunting, foraging, and survival.[6][9] Tactile feedback during grasp initiation arises from specialized skin receptors in the glabrous skin of the hand, particularly Meissner's corpuscles and Merkel cells. Meissner's corpuscles, located in dermal papillae, are rapidly adapting mechanoreceptors sensitive to low-frequency vibrations (10–50 Hz) and skin slippage, firing at stimulus onset and offset to signal object movement and aid grip adjustments.[10] Merkel cells, slowly adapting type I receptors in the epidermal basal layer, detect sustained pressure and provide high-resolution spatial information (up to 0.5 mm) for texture and shape discrimination, ensuring stable contact during initial grasp closure.[11]

Neural Mechanisms of Grasping

The neural mechanisms of grasping involve coordinated activity across multiple brain regions and spinal circuits to plan, execute, and maintain grip actions. The primary motor cortex (M1) and premotor cortex play central roles in planning and generating grasp trajectories, with M1 neurons encoding specific force and kinematic parameters for hand shaping during reach-to-grasp movements.[12] In the premotor cortex, particularly the dorsal premotor area (PMd), neurons signal grasp dimensions and forces, integrating visual cues to preshape the hand before contact, while the ventral premotor cortex (PMv) facilitates interactions between object properties and motor output.[13] These frontal areas coordinate with each other to transform perceptual inputs into precise motor commands, ensuring smooth trajectory execution.[14] The parietal cortex, especially the anterior intraparietal area (AIP), is crucial for visuomotor integration, where it processes object affordances such as shape, size, and orientation to select appropriate grasp types. AIP neurons encode grip configurations based on visual features, relaying this information to premotor regions via parieto-frontal connections to guide hand orientation and aperture during grasping.[15] This integration allows for goal-directed adjustments, distinguishing between power and precision grasps by representing object geometry in a motor-compatible format.[16] Cerebellar contributions refine grasping through predictive control of grip force and proprioceptive feedback, enabling anticipatory adjustments to object weight and slip risks before sensory errors occur. Cerebellar damage impairs the scaling of grip forces to load variations, highlighting its role in maintaining stable manipulation via internal models of dynamics.[17] At the spinal level, reflex arcs provide rapid, automatic adjustments for grasp maintenance, with long-latency reflexes modulating grip force in response to perturbations like load changes, operating independently of slower cortical loops.[18] These spinal mechanisms ensure reflexive stabilization, such as countering slips through enhanced flexor activation.[19] Neurotransmitter systems, notably dopamine, support motor learning for grasping by modulating synaptic plasticity in motor cortex circuits, facilitating the acquisition and refinement of skilled grip sequences through reward-based reinforcement. Dopaminergic projections from the ventral tegmental area to M1 enhance learning-dependent changes in neural excitability, critical for adapting grasps to novel objects or contexts.[20] This dopaminergic influence promotes long-term retention of grasp motor programs, integrating sensory feedback with volitional control.[21]

Types of Grasps

Power Grasps

Power grasps are defined as enveloping grips that utilize multiple fingers and the palm to securely hold large or heavy objects, emphasizing stability and force application rather than fine control. This type of grasp involves the thumb pressing against the object in opposition to the fingers curled around it, creating a stable enclosure that distributes forces across the hand's surface.[22] Common subtypes include the hook grasp, where the fingers flex to form a hook shape for suspending loads without full palmar involvement, such as carrying a heavy briefcase, and the spherical grasp, which wraps the fingers and palm around rounded objects like balls or tools with curved handles.[23] These variations allow adaptation to object shape while maintaining overall enclosure. For instance, gripping a hammer during use exemplifies a cylindrical power grasp, where the hand envelops the handle for forceful swinging, while holding a steering wheel employs a palmar power grasp for sustained control.[23] Biomechanically, power grasps offer advantages through extensive palmar contact, which maximizes friction via the adductor pollicis muscle to prevent slippage under high loads, and distributes forces evenly across the hand's arches for enhanced stability.[22] The proximal transverse arch provides rigidity, while the distal arches enable flexibility, allowing efficient force transmission without localized stress.[22] In human evolution, power grasps played a key role in ancestral tool handling and in climbing arboreal supports, reflecting adaptations in hominins like Australopithecus afarensis for both locomotion and manipulation.[24] These capabilities likely emerged alongside thumb opposition, enabling secure enclosure of objects in early hominin lineages.[24]

Precision Grasps

Precision grasps involve tip-to-tip or pad-to-pad contacts between the thumb and one or more fingers, enabling the secure handling of small objects through oppositional finger movements.[25] This form of grip, first systematically classified by John Napier in 1956, contrasts with broader enclosing patterns by emphasizing finger dexterity over whole-hand enclosure.[26] Key subtypes include the pincer grasp, which uses thumb-index finger opposition for pinching minute items like needles, and the tripod grasp, involving the thumb, index, and middle fingers for tasks requiring stable control.[27] These variations allow for precise manipulation of small objects. Biomechanically, precision grasps feature minimal palm involvement, with primary force generation and stability derived from the digital joints of the fingers and thumb, facilitating fine adjustments via opposition types such as pad or tip contacts. This reliance on distal phalanges and interphalangeal joints supports high dexterity without requiring extensive proximal muscle activation.[28] In daily activities, precision grasps are essential for tasks like writing, where the tripod subtype provides the control needed for legible script, and buttoning clothes, which depends on pincer opposition to manipulate small fasteners.[29][30]

Developmental Aspects

Grasping Reflexes

The grasping reflexes in human infants represent primitive, involuntary motor responses that emerge early in fetal development and play a foundational role in initial interactions with the environment. These reflexes are elicited by tactile stimulation and involve automatic muscle contractions without conscious intent, distinguishing them from later voluntary grasping behaviors. Among the most prominent is the palmar grasp reflex, which manifests as an automatic flexion of the fingers when the palm is gently stroked or an object is placed in the hand.[31] This response is present from birth, detectable as early as 25 weeks postconceptional age in preterm infants, and enables newborns to temporarily hold objects with considerable strength, often supporting their full body weight if pulled by the grasped item.[31] A related reflex is the plantar grasp reflex, observed in the feet, where stroking the sole of the foot prompts the toes to curl downward in a grasping motion, analogous to the hand's palmar response.[32] This reflex similarly appears prenatally and is elicited through sensory input to the foot's plantar surface, facilitating early postural adjustments.[33] Both reflexes rely on subcortical neural pathways, primarily mediated by the spinal cord and brainstem, with minimal influence from higher cortical centers, thus lacking voluntary control in early infancy.[34] The immature brain's insufficient inhibition of these spinal mechanisms allows the reflexes to dominate motor output initially.[34] These grasping reflexes typically integrate and fade as the central nervous system matures, with the palmar grasp reflex disappearing between 5 and 6 months of age, coinciding with the emergence of cortical control over voluntary movements.[31] The plantar grasp reflex persists somewhat longer, often until 9 to 12 months, before fully integrating into purposeful locomotion.[32] In neonatal assessments, eliciting these reflexes serves as a critical indicator of neurological integrity, where their absence or asymmetry may signal potential issues such as spinal cord injury or cerebral dysfunction.[31] Standardized testing involves applying gentle pressure to the palm or sole while observing the response strength and symmetry, contributing to early detection of developmental anomalies.[31]

Acquisition of Voluntary Grasping

The acquisition of voluntary grasping emerges during Jean Piaget's sensorimotor period (birth to approximately 2 years), marking the transition from reflexive responses to intentional, goal-directed actions that integrate sensory input with motor output.[35] In the early substages (birth to 4 months), infants progress from innate reflexes to primary circular reactions, where they repeat pleasurable sensations, such as batting at objects, laying the groundwork for purposeful movement.[36] By substage 3 (4-8 months), secondary circular reactions drive interest in environmental effects, leading to coordinated reaching and grasping of nearby items, with voluntary reaches becoming reliable around 2-4 months as the palmar grasp develops for larger objects.[35] This phase coincides with the fade-out of the primitive grasping reflex around 3-4 months, enabling adaptive exploration.[36] Later, in substage 4 (8-12 months), infants coordinate schemes for more complex actions, achieving the inferior pincer grasp—using thumb and index finger—for small objects by 9-12 months.[35] Environmental factors significantly shape this progression, with opportunities for object exploration fostering skill refinement through trial-and-error practice.[37] Parental interactions, such as presenting graspable toys or encouraging manipulation during play, enhance reaching accuracy and persistence, as infants learn to adjust grips based on object properties like size and texture.[38] For instance, enriched environments with varied manipulatives promote earlier transitions from whole-hand to finger-based grasps, underscoring the role of caregiver scaffolding in motor learning.[39] Maturation of visuomotor coordination underpins the shift from power grasps (encompassing objects with the whole hand for stability) to precision grasps (opposing fingers for dexterity), driven by improving hand-eye alignment and predictive control.[36] Around 4-6 months, infants begin visually guiding reaches, reducing errors in trajectory and orientation; by 9-12 months, this coordination allows anticipatory adjustments, such as rotating the wrist to match object affordances, facilitating finer manipulations. Recent electrophysiological studies using event-related potentials (ERPs) in 9-month-olds show neural differentiation between congruent and incongruent grasps, with components like P400 and N400 indicating early visual processing of grasp fit, even before full precision grip mastery.[40][41] Cross-cultural variations influence these timelines, with infants in environments emphasizing early motor stimulation showing advanced precision grasping. For example, 9-month-old Ghanaian infants outperform peers from China and the United States in pellet-grasping tasks, achieving higher-quality thumb-finger opposition (odds ratio 2.2-2.5), likely due to cultural practices promoting upright positioning and object handling.[42] Early voluntary grasping proficiency correlates with long-term fine motor outcomes, predicting superior dexterity and academic performance in school-age children. Infants with robust reaching at 3-6 months exhibit enhanced object manipulation and attention skills by 15 months, which extend to better handwriting and problem-solving abilities at 5-7 years.[43] Hand function assessed at 18-22 months independently forecasts manual dexterity at school age, independent of perinatal factors, highlighting grasping as a foundational predictor of adaptive motor skills.[44] Furthermore, trajectories of manipulation complexity from 9 to 14 months predict expressive and receptive language skills at 2 years, with higher complexity groups showing significantly better scores independent of socioeconomic factors.[45]

Clinical and Pathological Aspects

Grasping Impairments

Grasping impairments encompass a range of neurological and physical conditions that disrupt the ability to form and maintain effective hand grips, leading to reduced functional independence in daily activities. These deficits often stem from disruptions in motor control, sensory processing, or musculoskeletal integrity, manifesting as weakness, incoordination, or altered force application during reach-to-grasp tasks.[46] In stroke-induced hemiparesis, upper limb weakness and coordination deficits commonly impair grip strength and precision, affecting up to 85% of survivors and resulting in excessive or insufficient force scaling during object manipulation. Patients exhibit reduced ability to adjust grip forces temporally and spatially, leading to unstable holds and frequent object drops, particularly in the contralesional hand. This stems from lesions in motor pathways, disrupting the coupling between reach and grasp phases.[47][48][49] Cerebral palsy presents grasping impairments through spastic or ataxic subtypes, where brain lesions alter hand motor control from early development. In spastic cerebral palsy, hypertonia causes persistent flexed postures and limited finger extension, hindering precision grasps and promoting fisted configurations that resist object release. Ataxic forms involve intention tremors and dysmetria, resulting in overshooting or undershooting during reaches, often leading to dropped objects due to poor endpoint accuracy and coordination. These manifestations significantly limit manual dexterity, with spasticity and sensory deficits correlating strongly to overall hand function decline.[50][51][52] Peripheral neuropathies, such as carpal tunnel syndrome, primarily impair sensory feedback from median nerve compression, disrupting tactile cues essential for modulating grip forces. This leads to deficits in precision pinch tasks, with patients applying excessive forces or failing to balance load forces, increasing slip risk during sustained holds. Sensorimotor integration is compromised, as reduced afferent signals from the digits hinder anticipatory grasp adjustments.[53][54][55] In Parkinson's disease, grasping impairments arise from bradykinesia, rigidity, and impaired force scaling, leading to prolonged reach-to-grasp times, reduced grip force modulation, and coordination deficits between transport and grasp phases. These affect both power and precision grasps, increasing drop risk and limiting fine motor tasks, with subthalamic nucleus activity disruptions contributing to kinematic abnormalities.[56][57] Aging-related declines, particularly from hand osteoarthritis, reduce joint mobility and muscle power, impairing power grasps that require whole-hand enclosure. Affected individuals show 20-25% lower grip strength after age 60, with joint stiffness limiting thumb opposition and finger flexion, resulting in weaker cylindrical or spherical grips for larger objects. This progressive loss correlates with sarcopenia and dynapenia, exacerbating functional limitations in forceful tasks.[58][59][60] Diagnostic tools for assessing these impairments include grasp force measurements via dynamometers, which quantify maximal and sustained grip strength to identify weakness patterns, and kinematic analyses using motion-capture systems or sensorized gloves to evaluate reach-to-grasp trajectories. These methods reveal abnormalities in velocity profiles, aperture modulation, and joint coordination, providing objective metrics for impairment severity without relying on subjective reports. For instance, kinematic toolboxes enable automated tracking of finger synergies and postural deviations in clinical settings.[61][62][63]

Therapeutic Interventions for Grasping Deficits

Therapeutic interventions for grasping deficits aim to restore functional hand use through targeted rehabilitation strategies, particularly following neurological events such as stroke or hand injuries. These approaches emphasize neuroplasticity, motor relearning, and compensatory techniques to improve grip strength, dexterity, and coordination. Evidence-based methods include behavioral therapies, technological aids, and neuromodulatory techniques, often tailored to the individual's impairment level and integrated into multidisciplinary care plans.[64] Occupational therapy techniques, such as constraint-induced movement therapy (CIMT), promote the use of the affected hand by restricting the unaffected limb, encouraging intensive practice of grasping tasks. CIMT involves shaping procedures to increase repetition of functional movements, leading to significant improvements in upper extremity motor function, including grasp quality and endurance, in chronic stroke patients. For instance, modified CIMT protocols have demonstrated enhanced motor execution in unilateral cerebral palsy, with gains in grip force and precision maintained over time.[65][66][67] Assistive devices provide mechanical support to facilitate power grasps and reduce compensatory strain during daily activities. Adaptive grips, such as universal cuffs or silicone aids, enable secure object handling for individuals with reduced grip strength, while soft exoskeletons like the IronHand or GRIPIT assist in tripod and power grasp postures by augmenting finger flexion. These devices have been shown to improve hand function in rehabilitation settings, particularly for spinal cord injury or post-stroke recovery, by allowing progressive loading without excessive fatigue. Systematic reviews highlight their role in enhancing independence.[68][69][70] Neuromodulation methods, including repetitive transcranial magnetic stimulation (rTMS), target motor cortex plasticity to bolster grasping recovery. High-frequency rTMS over the ipsilesional hemisphere enhances excitability and cortical reorganization, improving motor outcomes in post-stroke patients with hand paresis. Studies indicate that combining rTMS with physical therapy yields greater gains in fine motor skills, such as pinch and grasp precision, compared to therapy alone. Low-frequency rTMS on the contralesional hemisphere further inhibits interhemispheric competition, facilitating affected hand use.[71][72][73] Post-surgical rehabilitation for hand injuries employs progressive exercises to rebuild grasp hierarchies, starting with basic hook grasps and advancing to pincer grasps as tendon gliding and strength improve. Protocols like the Saint John regimen initiate protected active flexion within days post-flexor tendon repair, incorporating blocking exercises to isolate flexor tendons and gradually introduce composite grips using putty or tubing for resistance. This stepwise progression—from hook (flexor digitorum profundus isolation) to full fist, then lateral key, and finally thumb-index pincer—minimizes adhesions while restoring dexterity, with therapy sessions focusing on 10-20 repetitions per grasp type under supervision.[74][75][76] Outcome metrics, such as the Jebsen-Taylor Hand Function Test (JTHFT), quantify grasping improvements across subtests involving writing, card turning, and small object manipulation. Interventions like CIMT or neuromuscular electrical stimulation have led to improvements in completion times and accuracy on JTHFT grasping subtests, reflecting enhanced speed in chronic impairments. These gains correlate with real-world function, with responsive changes observed within 4-6 weeks of therapy.[77][78][79]

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