WordNet

hold firmly (同)hold_on
an automatic instinctive unlearned reaction to a stimulus (同)reflex response, reflex action, instinctive reflex, innate reflex, inborn reflex, unconditioned_reflex, physiological reaction
the act of gripping something firmly with the hands (or the tentacles) (同)taking hold, seizing, prehension
understanding with difficulty; "the lecture was beyond his most strenuous graspings"
(of leaves) bent downward and outward more than 90 degrees

PrepTutorEJDIC

…‘を'『しっかり握る』,『ぎゅっとつかむ』 / …‘を'『理解する』,把握する / (…を)捕まえ(捕らえ)ようとする《+『at』(『for』)+『名』》 / 《通例a~》(手などでしっかり)『捕まえること』,『つかむこと』 / 『理解』[『力』],知的把握[力]
反射(刺激に対する無意識の反応) / 《複数形で》反射的な動き / (光などの)反射,反射光;映像 / 反射性の / (カメラが)レフ鋼の,反射型の
欲深い(greedy) / しっかりつかむ,ぎゅっと握る

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2015/07/14 16:38:49」(JST)

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Grasp reflex

Grasp reflex of a 5 month old baby

Palmar grasp reflex (sometimes simply called grasp reflex) is a primitive reflex. It appears as early as 16 weeks^[1] in utero^[2]^[3]^[4] and persists until five or six months of age. When an object is placed in the infant's hand and strokes their palm, the fingers will close and they will grasp it with a palmar grasp. 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.^[5]

Significance

If it persists beyond 2-4 months, it delays or affects functions like grasping a rattle, releasing objects from hand and also hand manipulation skills.^{[citation needed]}

References

^ Sherer, DM (June 1993). "Fetal grasping at 16 weeks' gestation.". Journal of ultrasound in medicine : official journal of the American Institute of Ultrasound in Medicine 12 (6): 316. PMID 8515527.
^ Jakobovits, AA (2009). "Grasping activity in utero: a significant indicator of fetal behavior (the role of the grasping reflex in fetal ethology).". Journal of perinatal medicine 37 (5): 571–2. doi:10.1515/JPM.2009.094. PMID 19492927.
^ Jakobovits, A (2 September 2007). "[Grasping reflex activity in utero is one element of fetal behavior (Grasping activity is a part of fetal ethology)].". Orvosi hetilap (in Hungarian) 148 (35): 1673–5. doi:10.1556/OH.2007.28089. PMID 17720675.
^ Kurjak, A; Stanojevic, M; Andonotopo, W; Salihagic-Kadic, A; Carrera, JM; Azumendi, G (2004). "Behavioral pattern continuity from prenatal to postnatal life--a study by four-dimensional (4D) ultrasonography.". Journal of perinatal medicine 32 (4): 346–53. doi:10.1515/JPM.2004.065. PMID 15346822.
^ Futagi, Yasuyuki; Toribe, Yasuhisa; Suzuki, Yasuhiro (2012). "The Grasp Reflex and Moro Reflex in Infants: Hierarchy of Primitive Reflex Responses". International Journal of Pediatrics 2012: 1–10. doi:10.1155/2012/191562.

UpToDate Contents

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1. 新生児の神経学的検査 neurologic examination of the newborn
2. 成人における詳細な神経学的検査 the detailed neurologic examination in adults
3. 前頭側頭型認知症：臨床的特徴および診断 frontotemporal dementia clinical features and diagnosis
4. 幼児および小児における精密な神経学的評価 detailed neurologic assessment of infants and children
5. 脳性麻痺の診断および分類 diagnosis and classification of cerebral palsy

English Journal

[Electromyographic Analysis of Neck Muscles at a Simulated Rear-end Impact in Healthy Subjects].

Raven A1, Volk GF1, Stadler J1, Graßme R2, Anders C2, Guntinas-Lichius O1.
Laryngo- rhino- otologie.Laryngorhinootologie.2015 Jul 17. [Epub ahead of print]
Background: Despite the introduction of safety belts and head restraints, severe neck injuries still occur in traffic accidents. Whether there are anthropometric factors or muscular properties, that affect the reflex times during a rear-end collision, and if they have predictive value for the expect
PMID 26190040

Role of whiskers in sensorimotor development of C57BL/6 mice.

Arakawa H1, Erzurumlu RS2.
Behavioural brain research.Behav Brain Res.2015 Jul 1;287:146-55. doi: 10.1016/j.bbr.2015.03.040. Epub 2015 Mar 28.
The mystacial vibrissae (whiskers) of nocturnal rodents play a major role in their sensorimotor behaviors. Relatively little information exists on the role of whiskers during early development. We characterized the contribution of whiskers to sensorimotor development in postnatal C57BL/6 mice. A com
PMID 25823761

Modulation of muscle metaboreceptor activation upon sweating and cutaneous vascular responses to rising core temperature in humans.

Amano T1, Ichinose M2, Inoue Y3, Nishiyasu T4, Koga S5, Kondo N6.
American journal of physiology. Regulatory, integrative and comparative physiology.Am J Physiol Regul Integr Comp Physiol.2015 Jun 15;308(12):R990-7. doi: 10.1152/ajpregu.00005.2015. Epub 2015 Apr 8.
The present study investigated the role of muscle metaboreceptor activation on human thermoregulation by measuring core temperature thresholds and slopes for sweating and cutaneous vascular responses during passive heating associated with central and peripheral mechanisms. Six male and eight female
PMID 25855304

Japanese Journal

振子用回転検査を用いた体性感覚入力の影響の検討

北島明美,肥塚泉
Equilibrium research 71(3), 162-169, 2012-06-01
… To evaluate the influence of somatosensory input on the vestibulo-ocular reflex (VOR), we assessed 19 young, healthy volunteers with sinusoidal rotation tests. … (1) Subjects were told to grasp an earth-fixed metallic bar with their right hand. …
NAID 10030781790

1A2-D21 把持力調整反射を誘発する皮膚刺激の解明 : 第一報:振動刺激と力覚刺激を同時呈示可能な装置の開発

櫻井達馬,昆陽雅司,岡本正吾,田所諭
ロボティクス・メカトロニクス講演会講演概要集 2010, "1A2-D21(1)"-"1A2-D21(4)", 2010
… This reflex is called inducing reflective grasping force control. … Vibration stimuli and force senses are presented to a human finger, and change of the grasp force are observed by the force sensor. … In this paper, we change the parameters of the vibration stimuli and force senses and detect the difference of grasp force. …
NAID 110008741376

腱紡錘反射と伸張反射を考慮した1自由度指把握系のモデリング(機械力学,計測,自動制御)

菊池誠
日本機械学會論文集. C編 74(738), 395-399, 2008-02-25
… In this study, a mathematical model of the human finger grasp system was proposed on the basis of physiological findings as part of studies on the force feedback micromanipulator. … We proposed model of how these two reflex systems are mingling. …
NAID 110006623677