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Related Experiment Video

Updated: May 7, 2026

Simultaneous Whole-cell Recordings from Photoreceptors and Second-order Neurons in an Amphibian Retinal Slice Preparation

Simultaneous Whole-cell Recordings from Photoreceptors and Second-order Neurons in an Amphibian Retinal Slice Preparation

Published on: June 1, 2013

Ephaptic communication in the vertebrate retina.

Rozan Vroman¹, Lauw J Klaassen, Maarten Kamermans

¹1Retinal Signal Processing, Netherlands Institute for Neuroscience Amsterdam, Netherlands.

Frontiers in Human Neuroscience

|September 27, 2013

Summary

Horizontal cells (HCs) provide negative feedback to cones in the retina via a fast, noise-free ephatic mechanism. This electrical signaling enhances visual performance, especially in low light conditions.

Keywords:

cones ephaptic communication horizontal cells inhibition vertebrate retina

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Last Updated: May 7, 2026

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Immunohistochemical and Calcium Imaging Methods in Wholemount Rat Retina

Immunohistochemical and Calcium Imaging Methods in Wholemount Rat Retina

Published on: October 13, 2014

Area of Science:

Neuroscience
Retinal Physiology
Cellular Electrophysiology

Background:

Vertebrate retinal neurons, including cones, horizontal cells (HCs), and bipolar cells (BCs), utilize complex signaling pathways.
Cone-to-HC communication involves both chemical (glutamate release) and ephatic (electrical) mechanisms.
HCs provide feedback to cones, influencing neurotransmitter release and retinal processing.

Purpose of the Study:

To review the critical components of the ephatic communication mechanism between HCs and cones.
To explore the presence and characteristics of ephatic signaling in other biological systems.
To identify fundamental features for detecting ephatic mechanisms.

Main Methods:

Literature review of studies on retinal electrophysiology and intercellular communication.
Analysis of molecular and biophysical mechanisms underlying ephatic signaling.
Comparative analysis of ephatic communication across different biological systems.

Main Results:

Ephatic signaling involves HC hyperpolarization, current flow through connexin hemichannels, and altered extracellular potential.
This mechanism creates a rapid, noise-free negative feedback loop, enhancing cone presynaptic function.
The ephatic mechanism is crucial for retinal function under challenging conditions like low light.

Conclusions:

Ephatic communication is a vital, fast, and precise feedback pathway in the vertebrate retina.
Understanding ephatic mechanisms provides insights into neural computation and sensory processing.
Further research is needed to identify and characterize ephatic signaling in diverse biological contexts.