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GLOSSARY

Most of the terms given below are explained in the text, but it is hoped
that this alphabetical list with brief definitions will prove helpful.
It is a difficult task to make the definitions scientific and at the
same time brief, simple, and clear.

_Abnormal._ Having mental or physical characteristics widely different
from those commonly found in ordinary people.

_Acquired nature._ Those aspects of habit, skill, knowledge, ideas, and
ideals that come from experience and are due to experience.

_Action._ Muscular contractions usually producing motion of the body or
of some part of the body.

_Adaptation._ Adjustment to one's surroundings.

_Adaptive._ Readily changing one's responses and acquiring such new
responses as enable one to meet successfully new situations; also having
tendencies or characteristics which enable one to be readily adjustable.

_After-images._ Images that follow immediately after stimulation of a
sense organ, and resulting from this stimulation.

_Association._ Binding together ideas through experiencing them
together.

_Attention._ Relative clearness of perceptions and ideas.

_Attitude._ The tendency toward a particular type of response in action
or a particular idea or association in thought.

_Bond._ The connection established in the nervous system which makes a
certain response follow a certain stimulus or a certain idea follow
another idea or perception.

_Capacity._ The possibility of learning, achieving, etc.

_Color blindness._ Inability to experience certain colors, usually red
and green.

_Complementary color._ Complementary colors are those which, mixed in
the right proportion, produce gray.

_Congenital._ Inborn.

_Connection._ The nerve-path through which a stimulus produces a
respons