Also referred to as trait-positive hallucinator. Both terms are used to denote an individual with a history of hallucinatory experience who is not currently hallucinating. They are used in opposition to "trait-negative hallucinator, and non" hallucinator (which are both used to denote an individual without a history of hallucinatory activity), as well as to " hallucinator, a term used to denote an individual who is currently hallucinating.
References
Woodruff, P.W., Wright, I.C., Bullmore, E.T., Brammer, M., Howard, R.J., Williams, S.C., Shapleske, J., Rossell, S., David, A.S., McGuire, P.K., Murray, R.M. (1997). Hallucinations and the temporal cortical response to speech in schizophrenia: A functional magnetic resonance imaging study. American Journal of Psychiatry, 154, 1676-1682.
Dictionary of Hallucinations. J.D. Blom. 2010.