title: Repetitive exposure: brain and reflex measures of emotion and attention.
abstract: Effects of massed repetition on the modulation of the late positive potential elicited during affective picture viewing were investigated in two experiments. Despite a difference in the number of repetitions across studies (from 5 to 30), results were quite similar: The late positive potential continued to be enhanced when participants viewed emotional, compared to neutral, pictures. On the other hand, massed repetition did prompt a reduction in the late positive potential that was most pronounced for emotional pictures. Startle probe P3 amplitude generally increased with repetition, suggesting diminished attention allocation to repeated pictures. The blink reflex, however, continued to be modulated by hedonic valence, despite massive massed repetition. Taken together, the data suggest that the amplitude of the late positive potential during picture viewing reflects both motivational significance and attention allocation.
authors.affiliation: Center for the Study of Emotion and Attention, University of Florida, Gainesville, FL 32611, USA. vera.ferrari2@unibo.it
authors.forename: Vera
authors.initials: V
authors.lastname: Ferrari
authors.forename: Margaret M
authors.initials: MM
authors.lastname: Bradley
authors.forename: Maurizio
authors.initials: M
authors.lastname: Codispoti
authors.forename: Peter J
authors.initials: PJ
authors.lastname: Lang
mesh_terms: D000161:Acoustic Stimulation; D000328:Adult; D001288:Attention / Q000502:physiology*; D001767:Blinking / Q000502:physiology; D001921:Brain / Q000502:physiology*; D003627:Data Interpretation, Statistical; D004569:Electroencephalography; D004576:Electromyography; D004644:Emotions / Q000502:physiology*; D018913:Event-Related Potentials, P300 / Q000502:physiology; D005071:Evoked Potentials / Q000502:physiology; D005260:Female; D005403:Fixation, Ocular / Q000502:physiology; D006801:Humans; D008297:Male; D012018:Reflex / Q000502:physiology*; D013216:Reflex, Startle / Q000502:physiology; D055815:Young Adult