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

Human brain responses to different image contrasts

R Srebro1, R M Oguz, P D Purdy

  • 1Department of Ophthalmology, University of Texas Southwestern Medical Center at Dallas 75235-8592.

Vision Research
|April 1, 1994
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

Spinal cord hypothermia without systemic hypothermia.

AJNR. American journal of neuroradiology·2012
Same author

Review of current and emerging therapies in acute ischemic stroke.

Journal of neurointerventional surgery·2011
Same author

Assessment of Complication Types and Rates Related to Diagnostic Angiography and Interventional N euroradiologic Procedures. A Four Year Review (1993-1996).

Interventional neuroradiology : journal of peritherapeutic neuroradiology, surgical procedures and related neurosciences·2010
Same author

Intraarterial thrombolysis for thromboemboli associated with endovascular aneurysm coiling. Report of five cases.

Interventional neuroradiology : journal of peritherapeutic neuroradiology, surgical procedures and related neurosciences·2010
Same author

Preoperative embolization of cerebral arteriovenous malformations with onyx.

AJNR. American journal of neuroradiology·2008
Same author

Response to the commentary "how do we spin wingspan?".

AJNR. American journal of neuroradiology·2008
Same journal

Editorial for VSI Amblyopia: Advances in Amblyopia Research.

Vision research·2026
Same journal

Computational and mathematical models in vision: Quantitative approaches to understanding visual perception.

Vision research·2026
Same journal

Complex interactions between lightness, chroma, and hue in color ensemble perception.

Vision research·2026
Same journal

Driving with autism spectrum disorder: Exploring the impact of tactile hazard warnings on gaze behavior and hazard responses.

Vision research·2026
Same journal

Early visual processing in adults with ADHD: evidence from contrast sensitivity, spatial integration, and external noise.

Vision research·2026
Same journal

Pupil reflexes generate the peripheral drift illusion due to ON/OFF motion responses.

Vision research·2026
See all related articles

This study used magnetic resonance imaging to map human brain activity evoked by visual stimuli. Epicortical potential fields precisely located visual processing areas in the parietal and occipital cortices.

Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Visual Perception

Background:

  • Understanding the precise localization of brain activity is crucial for neuroscience.
  • Previous methods for mapping brain activity had limitations in spatial resolution and anatomical accuracy.

Purpose of the Study:

  • To investigate the localization of human brain activity evoked by visual stimuli using advanced neuroimaging techniques.
  • To compare the efficacy of scalp fields versus epicortical potential fields in pinpointing brain activity.
  • To determine the specific cortical areas involved in processing different visual contrasts (texture, disparity, luminance, color).

Main Methods:

  • Dynamic random-dot display generating square-wave gratings at varying contrasts (texture, stereo disparity, luminance, color).

Related Experiment Videos

  • Scalp electroencephalography (EEG) with 31 electrodes to measure potential fields.
  • Magnetic Resonance Imaging (MRI) for detailed individual anatomical data.
  • Integration of MRI and EEG data using a 3D digitizer and stereotactic headgear for accurate source localization.

    • Main Results:

    • Epicortical potential fields provided more accurate localization of evoked brain activity compared to scalp fields.
    • Procedures successfully corrected for anatomical variations between subjects.
    • Evoked activity was observed in the left posterior parietal cortex for luminance processing, right parietal cortex for texture processing, and right temporal cortex for color processing.

    Conclusions:

    • The combined use of MRI and EEG with advanced source localization techniques enables precise mapping of visual processing in the human brain.
    • Specific cortical regions are selectively involved in processing different visual features, demonstrating functional specialization.
    • Epicortical potential field estimation offers superior spatial resolution for neurophysiological studies.