title: [The bereitschaftspotential. The concept and methodology for acquiring it].
abstract: BACKGROUND
  The movement of extension of the index finger in a stereotyped manner, not as a reaction to any external or internal stimulus, is preceded by EEG activity representing activity of the supplementary motor area of the motor cortex.
  
  
  METHODS
  By averaging retrograde EEG activity prior to movement, the Bereitschaftspotential (BP) may be obtained, using the German nomenclature of the earliest investigators who first described it and its components NS1 and NS2. We include a table with normal values obtained from a group of healthy persons.
  
  
  CONCLUSIONS
  In our study we show the usefulness of off-line methodology with manual adjustment of the start of EMG activity to obtain better morphological definition and greater voltage of the BP. At the same time, continual acquisition with the trigger adjusted to a prefixed threshold (on-line methodology) means that a smaller BP is obtained, especially in persons with difficulty in the organization of this movement.
authors.affiliation: Servicio de Neurología, Unidad Integrada Hospital Sant Joan de Déu-Hospital Clínic, Universitat de Barcelona, España.
authors.forename: J
authors.initials: J
authors.lastname: Conill
mesh_terms: D000328:Adult; D000368:Aged; D003265:Contingent Negative Variation / Q000502:physiology*; D004569:Electroencephalography; D004576:Electromyography; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009069:Movement Disorders / Q000175:diagnosis
vernacular_title: El Bereitschaftspotential. Concepto y metodología de adquisición.