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

Processing of scotopic increments and decrements.

T J Purkiss1, A Hughes, P J DeMarco

  • 1Department of Psychological and Brain Sciences, University of Louisville, KY 40292, USA.

Visual Neuroscience
|May 12, 2001
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

Real-world patient characteristics and utilization patterns in patients with cholangiocarcinoma who received pemigatinib in the United States of America.

ESMO real world data and digital oncology·2026
Same author

The prognostic and predictive value of pre-treatment hematologic markers for oropharyngeal carcinoma stratified by HPV status and treated with definitive (chemo) radiation.

Radiotherapy and oncology : journal of the European Society for Therapeutic Radiology and Oncology·2025
Same author

Acute pancreatitis in pregnancy: meta-analysis of maternal and fetal outcomes.

The British journal of surgery·2021
Same author

Angle grinder injuries in orthopedics: A case series and review of the literature.

Trauma case reports·2021
Same author

Report from the Annual Conference of the British Society of Echocardiography, October 2018, ACC Liverpool, Liverpool.

Echo research and practice·2020
Same author

Sinecatechins ointment as a potential novel treatment for usual type vulval intraepithelial neoplasia: a single-centre double-blind randomised control study.

BJOG : an international journal of obstetrics and gynaecology·2020

The rod-bipolar pathway processes light differently for increments and decrements, unlike the cone pathway. This difference is due to signal channeling through the rod bipolar cell before reaching retinal ganglion cells.

Area of Science:

  • Visual neuroscience
  • Photoreceptor physiology
  • Retinal processing

Background:

  • Primate retinal ganglion cells receive signals from rod and cone photoreceptors via distinct pathways.
  • ON- and OFF-retinal pathways are known to process light increments and decrements differently, particularly under photopic (bright light) conditions.

Purpose of the Study:

  • To investigate whether the rod-bipolar pathway exhibits differential processing of light increments and decrements, similar to cone pathways.
  • To determine if the funneling of rod signals through the rod bipolar cell influences this processing.

Main Methods:

  • A psychophysical adaptation paradigm was employed using rapid-on or rapid-off sawtooth waveforms for adaptation.
  • Observers adapted to stimuli under both photopic and scotopic (dim light) conditions.

Related Experiment Videos

  • Detection thresholds for sawtooth stimuli were measured to assess adaptation effects.

    • Main Results:

    • Under photopic conditions, sawtooth adaptation asymmetrically raised detection thresholds, dependent on the adaptation stimulus polarity.
    • Under scotopic conditions, thresholds were elevated, but no significant selective adaptation (polarity-dependent effect) was observed.
    • Filtering stimuli to mimic the rod system's temporal response confirmed that sluggishness was not the cause of the lack of selective scotopic adaptation.

    Conclusions:

    • The rod-bipolar pathway shows reduced effectiveness in selective adaptation to light increments versus decrements compared to the cone pathway.
    • This reduced effectiveness is attributed to the channeling of rod signals through the rod bipolar cell before transmission to ON- and OFF-ganglion cells.
    • Unlike cone pathways, the rod pathway does not appear to differentially process light increments and decrements at the ganglion cell level due to this intermediary processing step.