“…A number of studies have been performed using the RID to measure primary and secondary process content in texts and verbal speech. The results support the validity of the RID, for example, marijuana produced more primary process content in written stories (West, Martindale, Hines, & Roth, 1983), paranoid schizophrenic participants produced more primary process content in free speech samples than did nonschizophrenic paranoids and nonpsychotic psychiatric patients (West & Martindale, 1988), and psilocybin, a hallucinogen, induced more primary process content (Martindale & Fisher, 1977). Primary process content in written stories was related to creativity as measured with the Alternate Uses Test, remoteness of word associations, and rated creativity in the written stories (Martindale & Daily, 1996).…”