Prof. Josiah Royce has suggested for this supposed form of hallucination the term "pseudo-presentiment."
By (I) a sensory hallucination or (2) a massive sensation, both being of telepathic origin.
From an evidential point of view the apparition is the most valuable class of death-warning, inasmuch as recognition is more difficult in the case of an auditory hallucination, even where it takes the form of spoken words; moreover, auditory hallucinations coinciding with deaths may be mere knocks, ringing of bells, &c.; tactile hallucinations are still more difficult of recognition; and the hallucinations of smell which are sometimes found as death-warnings rarely have anything to associate them specially with the dead person.
The contents of experience are not all alike true or valid: hallucination is possible; here the Stoics join issue with Epicurus.
His moral character was undoubtedly weak in other ways than this, but it is fair to remember that but for his astounding Confessions the more disgusting parts of it would not have been known, and that these Confessions were written, if not under hallucination, at any rate in circumstances entitling the self-condemned criminal to the benefit of considerable doubt.