consideration of the two kinds, and establishes no
presumption against the value of such consideration.
The case is precisely the same as in the discussion of
sensation as such. At the present time, however,
there seems to be no practical advantage in the
lengthy discussion of these or other hypothetical
sorts of experience.

Consciousness varies in degree. One extreme of
the range of variation is commonly known as a high
degree of attention, or concentration of attention.
The other extreme is inattention, to which the
term subconsciousness is also applied. The general
designation of attention is thus given only to the
higher degrees of consciousness. If referred to the
content, the degrees of consciousness are degrees
of vividness, which is sometimes called clearness.
Thus, to say that I attend to a sensation or percept
is equivalent to saying that the sensation or per-
cept is vivid. The content not attended to is non-
vivid. In a somewhat better use of the term we
speak of a high degree of vividness and a low degree
of vividness in the two cases mentioned. Whether
any content may properly be said to be not vivid
at all is a matter which we will consider later.

The term attention properly signifies a condition
or state of consciousness itself. Sometimes it is ap-

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