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

Visual responses and connectivity in the turtle pretectum

T X Fan1, A E Weber, G E Pickard

  • 1Department of Anatomy and Neurobiology, Saint Louis University, Missouri 63104, USA.

Journal of Neurophysiology
|June 1, 1995
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

A crystal plasticity model for metal matrix composites considering thermal mismatch stress induced dislocations and twins.

Scientific reports·2021
Same author

A new method to reliably determine elastic strain of various crystal structures from atomic-resolution images.

Scientific reports·2019
Same author

Pharmacological Characterization of a Novel Beta 3 Adrenergic Agonist, Vibegron: Evaluation of Antimuscarinic Receptor Selectivity for Combination Therapy for Overactive Bladder.

The Journal of pharmacology and experimental therapeutics·2016
Same author

Composite materials with enhanced dimensionless Young's modulus and desired Poisson's ratio.

Scientific reports·2015
Same author

The injury resistant ability of melanopsin-expressing intrinsically photosensitive retinal ganglion cells.

Neuroscience·2014
Same author

Meta-analysis of 74,046 individuals identifies 11 new susceptibility loci for Alzheimer's disease.

Nature genetics·2013
Same journal

Comprehensive Analysis of Auditory Nerve Fiber Responses using Fiber-Specific Modeling.

Journal of neurophysiology·2026
Same journal

HCN channels modulate the medium afterhyperpolarization and adjust the firing gain of fast alpha motoneurons in mice.

Journal of neurophysiology·2026
Same journal

Targeting intracranial electrical stimulation to network regions defined within individuals causes network-level effects.

Journal of neurophysiology·2026
Same journal

When "Noise" Isn't Simply Noise: Deterministic Postural Drive During Noisy Galvanic Vestibular Stimulation (nGVS).

Journal of neurophysiology·2026
Same journal

Abrupt Scene Onsets and Gradually Emerging Scene Information Produce Distinct EEG Decoding Dynamics.

Journal of neurophysiology·2026
Same journal

From discovery to translation: charting a course for the <i>Journal of Neurophysiology</i>.

Journal of neurophysiology·2026
See all related articles

Researchers studied direction-sensitive (DS) neurons in the turtle

Area of Science:

  • Neuroscience
  • Visual Processing
  • Comparative Biology

Background:

  • The dorsal midbrain plays a crucial role in visual processing.
  • Direction-sensitive (DS) neurons are vital for detecting motion in the visual field.
  • The mesencephalic lentiform nucleus (nLM) is a pretectal nucleus in the turtle brain.

Purpose of the Study:

  • To investigate the visual response properties of neurons in the turtle's mesencephalic lentiform nucleus (nLM).
  • To determine if nLM neurons are direction-sensitive and characterize their receptive fields.
  • To compare the visual responses of nLM neurons with those in the optic tectum and basal optic nucleus (BON).

Main Methods:

  • Extracellular spike recordings were performed in the dorsal midbrain of isolated turtle brains during visual stimulation.

Related Experiment Videos

  • Single units were isolated using slow-moving, full-field visual patterns presented to the contralateral retina.
  • Anterograde transport of horseradish peroxidase (HRP) was used to trace neural inputs to the nLM.

    • Main Results:

    • The majority of visually responsive neurons in the nLM were strongly direction-sensitive (DS).
    • The most effective stimulus for nLM cells was slow-moving patterns drifting nasally in the contralateral visual field.
    • nLM neurons exhibited large receptive fields, often centered in the superior visual field, and their responses were similar to BON neurons but with different preferred directions.

    Conclusions:

    • The mesencephalic lentiform nucleus (nLM) in turtles contains a population of direction-sensitive neurons crucial for visual motion detection.
    • nLM neurons receive direct visual input and exhibit response properties distinct from the optic tectum but similar to the basal optic nucleus (BON).
    • These findings contribute to understanding the neural circuitry of visual processing and motion detection in non-mammalian vertebrates.