PREHENSION PATTERNS
It is evident equally from a study of the
muscle-bone-joint anatomy and from observation
of the postures and motions of the hand
that an infinite variety of prehension patterns
is possible. For purposes of analysis, however,
it suffices to describe the principal types.
Seeking a logical basis for defining the major
prehension patterns, Keller et al. (9) found
that the object-contact pattern furnishes a
satisfactory basis for classification. From
photographic observation of the prehension
patterns naturally assumed by individuals
when (a) picking up and (b) holding for use