Related Experiment Video
Updated: Jun 20, 2026
07:53
Split Retina as an Improved Flatmount Preparation for Studying Inner Nuclear Layer Neurons in Vertebrate Retina
Published on: January 16, 2024
Approach sensitivity in the retina processed by a multifunctional neural circuit
Thomas A Münch1, Rava Azeredo da Silveira, Sandra Siegert
1Neural Circuit Laboratories, Friedrich Miescher Institute for Biomedical Research, Basel, Switzerland.
Nature Neuroscience
|September 8, 2009
Summary
Scientists identified a specific mouse retinal ganglion cell type and its neural circuit that detects approaching objects. This circuit uses a rapid inhibitory pathway, demonstrating efficient dual use for survival functions.
Area of Science:
- Neuroscience
- Vision Science
- Retinal Circuitry
Background:
- Survival necessitates detecting approaching objects, like predators.
- Understanding the specific neurons and circuits involved in this process is crucial.
Purpose of the Study:
- To identify the neurons and circuits mediating the detection of approaching objects in the mouse retina.
- To elucidate how these circuits confer approach sensitivity.
Main Methods:
- Genetic labeling of cell types
- Two-photon microscopy
- Electrophysiology
- Theoretical modeling
Main Results:
- Identified a novel approach-sensitive ganglion cell type in the mouse retina.
- Resolved key elements of its afferent neural circuit.
- Demonstrated that a rapid inhibitory pathway, involving AII amacrine cells and electrical synapses, is critical for approach sensitivity.
- Showed this pathway functions in reverse during daytime conditions compared to its known role in night vision.
Conclusions:
- A specific neural circuit in the mouse retina enables the detection of approaching objects.
- The AII amacrine cell-mediated inhibitory pathway plays a dual role in both day and night vision, highlighting neural circuit efficiency.
- This study reveals the neural basis for a vital survival function in the visual system.
Related Concept Videos
01:32The Retina
The retina is a layer of nervous tissue at the back of the eye that transduces light into neural signals. This process, called phototransduction, is carried out by rod and cone photoreceptor cells in the back of the retina.
01:20Anatomy of the Eyeball
The eye is a spherical, hollow structure composed of three tissue layers. The outer layer — the fibrous tunic, comprises the sclera — a white structure — and the cornea, which is transparent. The sclera encompasses some of the ocular surface, most of which is not visible. However, the 'white of the eye' is distinctively visible in humans compared to other species. The cornea, a clear covering at the front of the eye, enables light penetration. The eye's middle layer, the vascular tunic,...
01:24Vision
Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.
01:26Visual System
Light enters the eye through the cornea, a transparent, dome-shaped surface covering the surface of the eyeball that helps to direct and focus incoming light. This light is then channeled toward the pupil, an adjustable opening whose size is controlled by the iris. The iris, a pigmented muscle, regulates the amount of light entering the eye by contracting or dilating the pupil, thereby ensuring optimal light levels for clear vision.
Once through the pupil, the light passes through the lens, a...
Once through the pupil, the light passes through the lens, a...
01:22Photoreceptors and Visual Pathways
At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category, whereas...
01:20Parallel Processing
The brain processes sensory information rapidly due to parallel processing, which involves sending data across multiple neural pathways at the same time. This method allows the brain to manage various sensory qualities, such as shapes, colors, movements, and locations, all concurrently. For instance, when observing a forest landscape, the brain simultaneously processes the movement of leaves, the shapes of trees, the depth between them, and the various shades of green. This enables a quick and...