y the same conditions as tickling
nor is it relieved in the same way. There is interest, however,
in pointing out in this connection that, like tickling, itching
has a real parallelism to the specialized sexual sensations.
Bronson, who has very ably interpreted the sensations of itching
(New York Neurological Society, October 7, 1890; _Medical News_,
February 14, 1903, and summarized in the _British Medical
Journal_, March 7, 1903; and elsewhere), regards it as a
perversion of the sense of touch, a dysaesthesia due to obstructed
nerve-excitation with imperfect conduction of the generated force
into correlated nervous energy. The scratching which relieves
itching directs the nervous energy into freer channels, sometimes
substituting for the pruritus either painful or voluptuous
sensations. Such voluptuous sensations may be regarded as a
generalized aphrodisiac sense comparable to the specialized
sexual orgasm. Bronson refers to the significant fact that
itching occurs so frequently in the sexual region, and states
that sexual neurasthenia is sometimes the only discoverable cause
of genital and anal pruritus. (Cf. discussion on pruritus,
_British Medical Journal_, November 30, 1895.) Gilman, again
(_American Journal of Psychology_, vi, p. 22), considers that
scratching, as well as sneezing, is comparable to coitus.

The sexual embrace has an intimate connection with the phenomena of
ticklishness which could not fail to be recognized. This connection is,
indeed, the basis of Spinoza's famous definition of love,--"_Amor est
titillatio quaedam concomitante idea causae externae_,"--a statement which
seems to be reflected in Chamfort's definition of love as "_l'echange de
deux fantaisies, et le contact de deux epidermes_." The sexual act, says
Gowers, is, in fact, a skin reflex.[14] "The sexual parts," Hall and Allin
state, "have a ticklishness as unique as their function and as keen as
their importance." Herrick finds the supreme illustration of the summation
and irradiation theory of tickling in the phenomena of erotic excitement,
and points out that in harmony with this the skin of the sexual region is,
as Dogiel has shown, that portion of the body in which the tactile
corpuscles are most thoroughly and elaborately provided with anastomosing
fibres. It has been pointed out[15] that, when ordinary tactile
sensibility is partially abolished,--