title: Trials-to-criterion latent inhibition in humans as a function of stimulus pre-exposure and positive-schizotypy.
abstract: Latent inhibition (LI) is a phenomenon during which non-reinforced pre-exposure to a stimulus retards later learning of associations with that same stimulus. It has been suggested that LI is a positive function of the amount of stimulus pre-exposure (PE) and that with very small amounts of PE, facilitation rather than inhibition will occur-particularly in high positive-schizotypes. Although LI has been demonstrated as a function of the amount of pre-exposure in animals, human findings have not proved to be so uniform or consistent. The primary objective of the present study was to establish LI as a function of numbers of pre-exposure on visual and auditory trials-to-criterion tasks, with a secondary objective to establish latent facilitation (LF) with very low numbers of pre-exposure in high positive-schizotypes. Results revealed a uniform pattern of learning across pre-exposure conditions, including latent facilitation, on the visual, but not the auditory task. LF was also observed in the high, but not low, scorers in positive-schizotypy with very low numbers of pre-exposure on the visual task.
authors.affiliation: Department of Psychology, Institute of Psychiatry, King's College London, De Crespigny Park, UK. gstjb@gstjb.com
authors.forename: Giles St J
authors.initials: GS
authors.lastname: Burch
authors.forename: David R
authors.initials: DR
authors.lastname: Hemsley
authors.forename: Michael H
authors.initials: MH
authors.lastname: Joseph
mesh_terms: D000161:Acoustic Stimulation; D000328:Adult; D000704:Analysis of Variance; D001245:Association Learning; D003213:Conditioning, Psychological; D005260:Female; D006801:Humans; D007266:Inhibition, Psychological; D008297:Male; D010775:Photic Stimulation; D016016:Proportional Hazards Models; D012565:Schizophrenic Psychology