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

Separable red-green and luminance detectors for small flashes

A Chaparro1, C F Stromeyer, R E Kronauer

  • 1Division of Applied Sciences, Harvard University, Cambridge, MA 02138.

Vision Research
|March 1, 1994
PubMed
Summary

The study reveals that red-green color vision, not brightness detection, is more sensitive at visual thresholds. This indicates a fixed spectral tuning for red-green detection, unaffected by luminance changes.

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

Inflammatory biomarkers in dentinal fluid as an approach to molecular diagnostics in pulpitis.

International endodontic journal·2020
Same author

Effect of perfluorodecanoic acid on pig oocyte viability, intracellular calcium levels and gap junction intercellular communication during oocyte maturation in vitro.

Toxicology in vitro : an international journal published in association with BIBRA·2019
Same author

IFPA meeting 2015 workshop report II: mechanistic role of the placenta in fetal programming; biomarkers of placental function and complications of pregnancy.

Placenta·2016
Same author

Texting while driving: is speech-based text entry less risky than handheld text entry?

Accident; analysis and prevention·2014
Same author

Studies on the regulation of assimilatory nitrate reductase in Ankistrodesmus braunii.

Planta·2014
Same author

Porphyromonas gingivalis, Treponema denticola and toll-like receptor 2 are associated with hypertensive disorders in placental tissue: a case-control study.

Journal of periodontal research·2013

Area of Science:

  • Visual Neuroscience
  • Color Vision Research
  • Photoreceptor Physiology

Background:

  • Understanding visual detection mechanisms is crucial for visual neuroscience.
  • Previous models debated the spectral tuning of cone-opponent pathways.
  • Luminance and chromatic pathways are fundamental to visual perception.

Purpose of the Study:

  • To investigate the primary detection mechanism at visual thresholds.
  • To determine the spectral tuning characteristics of the red-green visual system.
  • To examine the influence of luminance pedestals on chromatic detection.

Main Methods:

  • Measuring detection contours using L and M cone contrast coordinates.
  • Employing foveal flashes with varying sizes (2.3-15 min arc) and durations (200 msec).

Related Experiment Videos

  • Utilizing simultaneous red and green lights with varying ratios, alongside luminance pedestals.

    • Main Results:

    • The red-green mechanism, not luminance, showed higher sensitivity at detection thresholds.
    • Both temporal and spatial integration were greater for red-green detection compared to luminance.
    • Subthreshold luminance pedestals had no effect, while suprathreshold ones facilitated chromatic detection.

    Conclusions:

    • The red-green detection mechanism exhibits fixed spectral tuning with balanced L and M cone inputs.
    • This finding challenges the 'variable tuning hypothesis' regarding cone-opponent pathways.
    • Chromatic detection is robust and distinct from luminance processing, even under pedestal conditions.