Howard Kerr said this quote

Psychic change, as Todorov has recognized, subverted the genre in another way, by revoking the cultural taboos, the social censorship, that had prohibited the overt treatment of psychosexual themes, which then found covert expression in the supernatural tale. 'There is no need today to resort to the devil [or to posthumous reverie] in order to speak of excessive sexual desire, and none to resort to vampires in order to designate the attraction exerted by corpses: psychoanalysis, and the literature which is directly or indirectly inspired by it, deal with these matters in undisguised terms. The themes of fantastic literature have become, literally, the very themes of the psychological investigations of the last fifty years.

~ Howard Kerr

Supernatural fiction contains its own generic borderland: a neutral territory, which Tzvetan Todorov calls 'the fantastic,' between 'the marvelous' and 'the uncanny.' According to Todorov, 'The fantastic is that hesitation experienced by a person who knows only the laws of nature, confronting an apparently supernatural event.' Once the event is satisfactorily explained (and sometimes it is never explained), we have left the fantastic for an adjacent genre - either 'the uncanny,' where the apparently supernatural is revealed as illusory, or 'the marvelous,' where the laws of ordinary reality must be revised to incorporate the supernatural. As long as uncertainty reigns, however, we are in the ambiguous realm of the fantastic.

~ Howard Kerr

(Washington) Irving was only the first of the writers of the American ghostly tale to recognize that the supernatural, exactly because its epistemological status is so difficult to determine, challenged the writer to invent a commensurately sophisticated narrative technique.

~ Howard Kerr

But the recurrent ambiguity of the American tale of the supernatural reveals both a fascination with the possibility of numinous experience and a perplexity about whether there was, in fact, anything numinous to be experienced. Writers often delighted in leading readers into, but not out of, the haunted dusk of the borderland.

~ Howard Kerr