title: The premotor role of the prefrontal cortex in response consistency.
abstract: OBJECTIVE
  The aim of the present study was to investigate the cortical correlates of the intraindividual coefficient of variation (ICV) in a go/no-go task, focusing on the prefrontal cortex (PFC) contribution and evaluating both pre- and poststimulus brain activity.
  
  
  METHODS
  We recorded event-related potentials (ERPs) in 40 subjects, arranged a posteriori in 2 groups on the basis of their ICV values. By this method, we formed the consistent (low ICV; n = 20) and inconsistent (high ICV; n = 20) group: the age, speed, and accuracy performance of the 2 groups were matched.
  
  
  RESULTS
  The prestimulus anticipatory PFC activity, as reflected by the prefrontal negativity (pN) wave, and the poststimulus P3 component were larger in the consistent than in the inconsistent group. In contrast, no differences were observed between groups in the brain activities associated to motor preparation and early sensory processing.
  
  
  CONCLUSIONS
  Data are interpreted as an enhanced top-down control in consistent performers, likely characterized by a greater sustained attention on the task.
authors.affiliation: Department of Human Movement, Social and Health Sciences, University of Rome "Foro Italico"
authors.forename: Rinaldo Livio
authors.initials: RL
authors.lastname: Perri
authors.affiliation: Department of Human Movement, Social and Health Sciences, University of Rome "Foro Italico"
authors.forename: Marika
authors.initials: M
authors.lastname: Berchicci
authors.affiliation: Department of Human Movement, Social and Health Sciences, University of Rome "Foro Italico"
authors.forename: Giuliana
authors.initials: G
authors.lastname: Lucci
authors.affiliation: Department of Human Movement, Social and Health Sciences, University of Rome "Foro Italico"
authors.forename: Donatella
authors.initials: D
authors.lastname: Spinelli
authors.affiliation: Department of Human Movement, Social and Health Sciences, University of Rome "Foro Italico"
authors.forename: Francesco
authors.initials: F
authors.lastname: Di Russo
mesh_terms: D000328:Adult; D001288:Attention / Q000502:physiology; D003071:Cognition / Q000502:physiology; D004569:Electroencephalography; D005071:Evoked Potentials / Q000502:physiology; D005260:Female; D006801:Humans; D007206:Individuality; D008297:Male; D008875:Middle Aged; D009068:Movement / Q000502:physiology*; D017397:Prefrontal Cortex / Q000502:physiology*; D011597:Psychomotor Performance