William Cook said this quote

“ It's safe to say that 'Horror,' as a fictional genre, has claim to it's own canon. There is a definite history that can be traced back to the origins of human language, both orally and written, and now multimedia based. We at this point, have access to the full gambit of 'genre' Horror in all its hybrid forms (electronically at least). Sub-genres ensure that Horror can and will multiply in its complexities and evolve along with human fears. ”