To watch a curious young macaque explore and manipulate his immediate
surroundings must surely delight and amaze us all. The monkey selects a
particular objectfor scrutiny, reaches out and grasps it, handles it
delicately with the fingers or more forcibly with the hand, scans the
various surfaces with the fin- ger pads, and finally identifies it. If
we compare this monkey's adroitness and discriminative capacities with
our own, at once we have a concise statement of important biological
similarities and differences among primates. While there are species
diffe- rences in the functional anatomy of the hand, in tactile sensibi-
lity, and in the control of hand movements, these are relatively minor.
The real difference in the dexterity of the two species relates to the
complexity of the task that is executed: no monkey, and for that matter
only one man in a century, paints a Guernica, although an astute
investigator can readily teach the monkey to flourish a brush and paint
a few strokes. The goal of the symposium, of which this book is a
summary, was to examine current knowledge of those cortical mecha- nisms
that determine the sensorimotor functions of the hand that are common to
man and the monkey - mechanisms accessible to analysis by recording the
responses of single cortical neurons while the monkey explores and
manipulates his surroundings.