Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

P3a from visual stimuli: typicality, task, and topography.

John Polich1, Marco D Comerchero

  • 1Department of Neuropharmacology TPC-10, The Scripps Research Institute, La Jolla, California 92037, USA. polich@scripps.edu

Brain Topography
|April 23, 2003
PubMed
Summary
This summary is machine-generated.

Related Concept Videos

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

50+ years of P300: Where are we now?

Psychophysiology·2020
Same author

Heart rate and P300: Integrating peripheral and central indices of cognitive processing.

International journal of psychophysiology : official journal of the International Organization of Psychophysiology·2016
Same author

Carboxyfullerene neuroprotection postinjury in Parkinsonian nonhuman primates.

Annals of neurology·2014
Same author

Event-related delta, theta, alpha and gamma correlates to auditory oddball processing during Vipassana meditation.

Social cognitive and affective neuroscience·2012
Same author

P3a from white noise.

International journal of psychophysiology : official journal of the International Organization of Psychophysiology·2012
Same author

Evaluation of auditory, visual and olfactory event-related potentials for comparing interspersed- and single-stimulus paradigms.

International journal of psychophysiology : official journal of the International Organization of Psychophysiology·2011

Task difficulty, not stimulus novelty, influences the P3a event-related potential. When discrimination is hard, the P3a response is larger and earlier, appearing centrally, unlike the target P3b response.

Area of Science:

  • Cognitive Neuroscience
  • Event-Related Potentials (ERPs)
  • Visual Attention

Background:

  • The P3a event-related potential (ERP) is sensitive to novel stimuli.
  • Its generation mechanism and scalp topography are not fully understood, especially in relation to task demands.

Purpose of the Study:

  • To investigate how stimulus typicality (novel vs. non-novel) and task discrimination difficulty affect P3a scalp topography.
  • To determine the primary drivers of P3a generation: stimulus novelty or task context.

Main Methods:

  • A visual three-stimulus paradigm (target, nontarget, standard) was used.
  • Nontarget stimuli varied in typicality (letters, squares, novel patterns).
  • Discrimination difficulty between target and standard was manipulated.

Related Experiment Videos

Main Results:

  • In easy discrimination tasks, target P300 amplitude exceeded nontarget P300, with parietal maximums.
  • In difficult tasks, nontarget P3a was larger and earlier (frontal/central), while target P3b was larger and later (parietal).
  • P3a amplitude was maximal for large squares or novel patterns.

Conclusions:

  • Stimulus context, defined by task discrimination difficulty, is a key determinant of P3a generation.
  • The findings challenge the notion that novelty alone drives P3a, emphasizing the role of task demands.