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

Contour decouples gamma activity across texture representation in monkey striate cortex.

A Gail1, H J Brinksmeyer, R Eckhorn

  • 1Philipps-University, Physics Department, Neurophysics Group, Renthof 7, D-35032 Marburg, Germany.

Cerebral Cortex (New York, N.Y. : 1991)
|September 13, 2000
PubMed
Summary

This study reveals that neural activity in the visual cortex (V1) decouples between figure and ground representations, challenging previous assumptions about gamma synchronization in scene segmentation. Reduced gamma-band coherence in later visual processing stages supports figure-ground segregation.

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

Author Correction: Statistical determinants of visuomotor adaptation along different dimensions during naturalistic 3D reaches.

Scientific reports·2022
Same author

Statistical determinants of visuomotor adaptation along different dimensions during naturalistic 3D reaches.

Scientific reports·2022
Same author

Implantable computer-controlled adaptive multielectrode positioning system.

Journal of neurophysiology·2017
Same author

Standardized automated training of rhesus monkeys for neuroscience research in their housing environment.

Journal of neurophysiology·2017
Same author

A cage-based training, cognitive testing and enrichment system optimized for rhesus macaques in neuroscience research.

Behavior research methods·2016
Same author

Neural mechanisms of scene segmentation: recordings from the visual cortex suggest basic circuits for linking field models.

IEEE transactions on neural networks·2008

Area of Science:

  • Neuroscience
  • Visual Perception
  • Computational Neuroscience

Background:

  • Previous studies on figure-ground coding in monkey V1 reported enhanced firing rates and gamma synchronization, but no decreased signal correlation across contours.
  • This finding appeared to contradict the proposed role of gamma synchronization in scene segmentation.

Purpose of the Study:

  • To re-examine figure-ground segregation mechanisms by analyzing various coupling measures and frequency ranges of population activity.
  • To investigate the role of neural decoupling in distinguishing objects from their backgrounds.

Main Methods:

  • Recorded multiple unit activity (MUA) and local field potentials (LFPs) using parallel microelectrodes in monkey V1.
  • Stimulated V1 with a grating containing a shifted rectangle to define an object.

Related Experiment Videos

  • Analyzed coherence and decoupling measures across different frequency bands and epochs.

    • Main Results:

    • Found strong decoupling of population activity between figure and ground representations, contrasting with previous conclusions.
    • Observed significant reduction in coherence of late gamma-band LFPs between figure and ground.
    • Noted absence of reduction in LFP and MUA coherence during early high-amplitude transients and in low frequencies during later epochs.

    Conclusions:

    • Decoupling of population activity, particularly in late gamma-band LFP components, supports figure-ground segregation.
    • These findings suggest a more nuanced role for neural synchrony and decoupling in visual scene analysis.