When you snap your thumb against your middle and forefinger Opposition is performed.
Opposition is the type of movement that is only for the hands. Opposition is them movement where you bring your finger/s in contact with your thumb. When you put it back to its anatomical position, which is beside the index finger (pointing finger) this is called reposition.
Opposition of the thumb is defined as the positioning of the thumb pad diametrically opposite to the distal pad of the middle finger, be this positioning for grasp of small or large objects. Opposition is the placement of the thumb in the position rather than the activity of achieving grasp.
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