Nunberg considers certain problems presented by the phenomena of hallucinations. He uses the Schreber material as presented by Katan in his paper, Further Remarks About Schreber's Hallucinations. Nunberg emphasizes that the patient's weak ties with reality are a reason for the hallucinatory phenomena.

Freud pointed out that delusions and hallucinations always contain a fragment of historic truth; this is what gives strength to the patient's belief in his hallucinations. Two difficulties arise from Freud's observation: first, all neuroses have a kernel of truth, and second, this fact tends to eliminate the barrier between neurosis and psychosis. Nunberg says we should try to find out 'what