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Grasping Skills (Erhardt Prehension Developmental Levels), Releasing Skills, and Bilateral Hand Use
Taken from TherapyEd NBCOT Study Guide, 5th Ed, Chapter 3.
Terms in this set (24)
Grasp of pellet: Natal
No voluntary grasp or visual attention to the object.
Grasp of pellet: 3 months
No attempt to grasp, but visually attends to the object.
Grasp of pellet: 6 months
Raking ad contacting object.
Grasp of pellet: 7 months
Inferior-scissors grasp: raking object into the palm with adducted totally flexed thumb and all flexed fingers, or two partially extended fingers.
Grasp of pellet: 8 months
Scissors grasp: between thumb and side of curled index finger, distal thumb joint slightly flexed, proximal thumb joint extended.
Grasp of pellet: 9 months
Inferior pincer grasp: between ventral surfaces of thumb and index finger, distal thumb joint extended, beginning of thumb opposition.
Grasp of pellet: 10 months
Pincer grasp: between distal pads of thumb and index finger, distal thumb joint slightly flexed, thumb opposed.
Grasp of pellet: 12 months
Fine pincer grasp: between fingertips or fingernails, distal thumb joint flexed.
Grasp of cube: Neonate
Visually attends to object, grasp is reflexive.
Grasp of cube: 3 months
Visually attends to object and may swipe. Sustained voluntary grasp possible only upon contact, ulnar side used, no thumb involvement, wrist flexed.
Grasp of cube: 4 months
Primitive squeeze grasp: visually attends to object, approaches if within 1 inch, contact results in hand pulling object back to squeeze precariously against the other hand or body, no thumb involvement.
Grasp of cube: 5 months
Palmar grasp: fingers on top surface of object press it into center of palm with thumb adducted.
Grasp of cube: 6 months
Radial-Palmar grasp: fingers on far side of object press it against opposed thumb and radial side of palm.
Grasp of cube: 7 months
Radial-Palmar grasp: same as 6 months but wrist is straight.
Grasp of cube: 8 months
Radial-digital grasp: object held with the opposed thumb and fingertips, space visible between.
Grasp of cube: 9 months
Radial-digital grasp: same as 8 months but with wrist extended.
Releasing skills: 0-1 month
Releasing skills: 1-4 months
Releasing skills: 5-6 months
Two stage transfers.
Releasing skills: 6-7 months
One stage transfers.
Releasing skills: 7-9 months
Voluntary release. Release with full arm extension.
Bilateral hand use: 12-18 months
Infant uses both hands for different functions.
Bilateral hand use: 18-24 months
Manipulation skills emerge.
Bilateral hand use: 2 1/2 years
Ability to use two different hands for two very different functions emerges.
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