title: ERPs and contextual semantic discrimination: degrees of congruence in wakefulness and sleep.
abstract: This study explores whether the brain can discriminate degrees of semantic congruency during wakefulness and sleep. Experiment 1 was conducted during wakefulness to test degrees of congruency by means of N400 amplitude. In Experiment 2, the same paradigm was applied to a different group of participants during natural night sleep. Stimuli were 108 sentences (definitions with two attributes) with four possible degrees of congruence as ending targets. In both studies, the amplitude of N400-like effect showed modulation according to the degree of congruency. The results indicate that the brain can accomplish sentential semantic discriminations not only in wakefulness but also in sleep.
authors.affiliation: Escuela de Psicología, Universidad Diego Portales, Vergara 275, Santiago, Chile. amibanez@puc.cl
authors.forename: Agustín
authors.initials: A
authors.lastname: Ibáñez
authors.forename: Vladimir
authors.initials: V
authors.lastname: López
authors.forename: Carlos
authors.initials: C
authors.lastname: Cornejo
mesh_terms: D000161:Acoustic Stimulation; D000328:Adult; D001921:Brain / Q000502:physiology*; D004192:Discrimination, Psychological; D005071:Evoked Potentials; D005260:Female; D006801:Humans; D008297:Male; D012660:Semantics; D012890:Sleep / Q000502:physiology*; D012895:Sleep, REM / Q000502:physiology; D014851:Wakefulness