title: P3b, consciousness, and complex unconscious processing.
abstract: How can perceptual consciousness be indexed in humans? Recent work with ERPs suggests that P3b, a relatively late component, may be a neural correlate of consciousness (NCC). This proposal dovetails with currently prevailing cognitive theory regarding the nature of conscious versus unconscious processes, which holds that the latter are simple and very brief, whereas consciousness is ostensibly required for more durable, complex cognitive processing. Using a P3b oddball paradigm, we instead show that P3b and even later, related slow wave activity occur under rigorously subliminal conditions. Additional principal component analysis (PCA) further differentiated the presence of both P3a and P3b components, demonstrating that the latter indeed occurred subliminally. Collectively, our results suggest that complex, sustained cognitive processing can occur unconsciously and that P3b is not an NCC after all.
authors.affiliation: Department of Psychiatry, University of Michigan, Ann Arbor, MI, USA. Electronic address: bsilverstein@gmail.com.
authors.forename: Brian H
authors.initials: BH
authors.lastname: Silverstein
authors.affiliation: Department of Psychiatry, University of Michigan, Ann Arbor, MI, USA.
authors.forename: Michael
authors.initials: M
authors.lastname: Snodgrass
authors.affiliation: Department of Psychiatry, University of Michigan, Ann Arbor, MI, USA.
authors.forename: Howard
authors.initials: H
authors.lastname: Shevrin
authors.affiliation: Department of Neurology, University of Michigan, Ann Arbor, MI, USA.
authors.forename: Ramesh
authors.initials: R
authors.lastname: Kushwaha
mesh_terms: D000293:Adolescent; D000328:Adult; D001921:Brain / Q000502:physiology* / Q000503:physiopathology; D003243:Consciousness / Q000502:physiology*; D018913:Event-Related Potentials, P300 / Q000502:physiology*; D005071:Evoked Potentials / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D008606:Mental Processes / Q000502:physiology*; D008875:Middle Aged; D014474:Unconsciousness / Q000175:diagnosis / Q000503:physiopathology*; D055815:Young Adult
keywords: Consciousness; Oddball; P3b; Subliminal