Flexing or extending one finger causes a similar movement in the fingers next to it. The flick is an example of that: the ring finger is lowered, dragged along by the middle finger.
Here, the five fingers form a gradient of flexion, ranging from the thumb (completely flexed) to the index finger, which is barely flexed. Flexing the little finger usually pulls the ring finger along with it.
Touching the Thumb
The thumb can only easily touch the tops of the other fingers on the first two phalanges of each.
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