Pseudonegative

The pseudonegative reaction must be carefully differentiated from the positive reaction. It is anaphylactic in nature and due to autolyzed diphtheria bacillus protein.

The first paper, "The hypnotic induction of hallucinatory color vision followed by pseudonegative afterimages," introduces an ingenious experimental paradigm whereby Erickson is able to explore the genuineness of hallucinatory color vision.

Primary and pseudonegative symptoms. It seems likely that the core deficits in the negative syndrome are poverty of affect and poverty of ideation.