Classification of musical hallucinations and the characters along with neural-molecular mechanisms of musical hallucinations associated with psychiatric disorders

Figure 1 The PRISMA protocol diagram for musical hallucinations study selection. A comprehensive search was conducted in the NCBI PubMed database, Google Scholar, and Web of Science to identify all available articles with key words of “music hallucination,” “musical hallucination,” “musical hallucination and mental illness,” “music hallucination and gender difference,” and “music hallucination and psychiatric disease.” Of 2681 publications were collected, 1049 of duplicate records together with those non-retrievable articles such as lack of full texts, non-English language or not related to musical hallucinations (MHs) were removed. The selected articles were further scrutinized to exclude those with some essential categories missing (as indicated as reason 1-3), and 241 MH publications were assembled to form the data pool for this study.