ge, and
to distinguish between a sensational image, _e.g._ the representation of
a colour, and a perceptional image, as the representation of a coloured
object. It may be well to add that, in speaking of a fusion of an image
and a sensation, I do not mean that the former exists apart for a single
instant. The term "fusion" is used figuratively to describe the union of
the two sides or aspects of a complete percept.

[7] This impulse to fill in visual elements not actually present is
strikingly illustrated in people's difficulty in recognizing the gap in
the field of vision answering to the insensitive "blind" spot on the
retina. (See Helmholtz, _Physiologische Optik_, p. 573, _et seq._)

[8] This relation will be more fully discussed under the head of
"Memory."

[9] I adopt this distinction from Dr. J. Hughlings Jackson. See his
articles, "On Affections of Speech from Diseases of the Brain," in
_Brain_, Nos. iii. and vii. The second stage might conveniently be named
apperception, but for the special philosophical associations of the
term: _Problems of Life and Mind_, third series, p. 107. This writer
employs the word "preperception" to denote this effect of previous
perception.

[10] Such verbal suggestion, moreover, acting through a
sense-impression, has something of that vividness of effect which
belongs to all excitation of mental images by external stimuli.

[11] See Wundt, _Physiologische Psychologie_, p. 723.

[12] For a confirmation of the view adopted in the text, see Professor
Bain, _The Senses and the Intellect_, Part II. ch. i. sec. 8; Herbert
Spencer, _Principles of Psychology_, vol. i. p. 234, _et passim_; Dr.
Ferrier, _The Functions of the Brain_, p. 258, _et seq._; Professor
Wundt, _op. cit._, pp. 644, 645; G. H. Lowes, _Problems of Life and
Mind_, vol. v. p. 445, _et seq._ For an opposite view, see Dr.
Carpenter, _Mental Physiology_, fourth edit., p. 220, etc.; Dr.
Maudsley, _The Physiology of Mind_, ch. v. p. 259, etc.

[13] See note, p. 22.

[14] Touch gives much by way of interpretation only when an individual
object, for example a man's hat, is recognized by aid of this sense
alone, in which case the perception distinctly involves the reproduction
of a complete visual percept. I may add that the organ of smell comes
next to that of hearing, with respect both to the range and definiteness
of its simultaneous sensations, and to the amount of information
furnished by these. A rough sense of di