title: Percept-based and object-based error processing: an experimental dissociation of error-related negativity and error positivity.
abstract: OBJECTIVE
  Investigated the effect of presentation duration of masked visual stimuli and presentation mode (randomized, blocked) on error-related negativity (ERN) and error positivity (Pe).
  
  
  METHODS
  In two experiments, participants responded with the left and right hand to leftward and rightward arrows presented for different durations (0-117 ms). Different stimulus durations were fully randomized in Experiment 1 but run in separate blocks in Experiment 2.
  
  
  RESULTS
  In both experiments, percent correct and Pe amplitude increased with increasing stimulus duration. By contrast, ERN was only found for (blocked) longer stimulus durations of Experiment 2, and absent with the randomized stimulus durations of Experiment 1.
  
  
  CONCLUSIONS
  Presence of a Pe in the absence of ERN in Experiment 1 suggests that conscious error processing can occur without prior unconscious error detection. To explain the pattern of ERN/Pe effects, two separate processes of error detection are suggested, operating independently at the levels of object-based (Pe) and purely perceptual stimulus representations (ERN), respectively.
  
  
  CONCLUSIONS
  A novel model of error processing is developed, elaborating on the reinforcement-learning theory of ERN. It is suggested that giving a response retrieves appropriate stimulus representations whose activation typically precedes this response; in case of mismatch with actually present stimuli, ERN is elicited.
authors.affiliation: Georg Elias Müller Institute for Psychology, University of Göttingen, Göttingen, Germany. hgibbon@gwdg.de
authors.forename: Henning
authors.initials: H
authors.lastname: Gibbons
authors.forename: Anna-Sophia
authors.initials: AS
authors.lastname: Fritzsche
authors.forename: Sonja
authors.initials: S
authors.lastname: Bienert
authors.forename: Anne-Simone
authors.initials: AS
authors.lastname: Armbrecht
authors.forename: Jutta
authors.initials: J
authors.lastname: Stahl
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D008297:Male; D010775:Photic Stimulation / Q000379:methods*; D011597:Psychomotor Performance / Q000502:physiology*; D011930:Reaction Time / Q000502:physiology*; D012107:Research Design / Q000592:standards; D014796:Visual Perception / Q000502:physiology*; D055815:Young Adult