used in a shared experience or joint action; in no sense does it
contravene that principle. When words do not enter as factors
into a shared situation, either overtly or imaginatively, they
operate as pure physical stimuli, not as having a meaning or
intellectual value. They set activity running in a given groove,
but there is no accompanying conscious purpose or meaning. Thus,
for example, the plus sign may be a stimulus to perform the act
of writing one number under another and adding the numbers, but
the person performing the act will operate much as an automaton
would unless he realizes the meaning of what he does.

3. The Social Medium as Educative. Our net result thus far is
that social environment forms the mental and emotional
disposition of behavior in individuals by engaging them in
activities that arouse and strengthen certain impulses, that have
certain purposes and entail certain consequences. A child
growing up in a family of musicians will inevitably have whatever
capacities he has in music stimulated, and, relatively,
stimulated more than other impulses which might have been
awakened in another environment. Save as he takes an interest in
music and gains a certain competency in it, he is "out of it"; he
is unable to share in the life of the group to which he belongs.
Some kinds of participation in the life of those with whom the
individual is connected are inevitable; with respect to them, the
social environment exercises an educative or formative influence
unconsciously and apart from any set purpose.

In savage and barbarian communities, such direct participation
(constituting the indirect or incidental education of which we
have spoken) furnishes almost the sole influence for rearing the