Related Experiment Video
Updated: Jun 19, 2026
08:33
Determination of Photoreceptor Cell Spectral Sensitivity in an Insect Model from In Vivo Intracellular Recordings
Published on: February 26, 2016
THE SPECTRAL SENSIBILITY OF THE SUN-FISH AS EVIDENCE FOR A DOUBLE VISUAL SYSTEM
1Laboratory of Biophysics, Columbia University, New York.
The Journal of General Physiology
|October 30, 2009
Summary
This study reveals Lepomis fish possess a duplex visual system, with distinct rod and cone functions. Their visibility curves suggest a shared photosensory substance, with spectral shifts explained by differing ocular media.
Area of Science:
- Comparative physiology
- Vision science
- Animal behavior
Background:
- Lepomis (sunfish) visual perception is crucial for survival.
- Previous methods limited visibility function measurements to lower light intensities.
- Understanding spectral sensitivity differences in visual systems is key.
Purpose of the Study:
- To measure the visibility function of Lepomis at high spectral illumination intensities.
- To quantitatively prove Lepomis possesses a physiologically duplex visual system.
- To investigate the relationship between rod and cone visual functions.
Main Methods:
- Extended a previous method to measure Lepomis visibility functions under high spectral illumination.
- Determined relative energies of spectral beams eliciting visual orienting responses to fine-line patterns.
- Compared visibility curves from fine-line (high intensity) and wide-bar (low intensity) patterns.
Main Results:
- A distinct visibility function was measured for Lepomis at high spectral illumination intensities.
- This function differed significantly from that measured at lower intensities with wider patterns.
- Quantitative proof was obtained for a physiologically duplex visual system in Lepomis, correlating with rod and cone anatomy.
Conclusions:
- The eye of Lepomis functions as a physiologically duplex system, with separate rod and cone contributions.
- Visibility curves for rods and cones are similar in shape but spectrally shifted (cones shifted to red).
- A shared photosensory substance in rods and cones is hypothesized, with spectral shifts attributed to differences in ocular media properties.
More Related Videos
06:41Assays to Detect UV-reflecting Structures and Determine their Importance in Mate Preference using the Sailfin Molly Poecilia latipinna
Published on: September 14, 2016
09:00Eye Removal in Living Zebrafish Larvae to Examine Innervation-dependent Growth and Development of the Visual System
Published on: February 11, 2022
Related Concept Videos
01:24Color Vision
Color perception begins in the retina, the light-sensitive layer at the back of the eye. Two main theories explain how colors are seen: the trichromatic theory and the opponent-process theory. The trichromatic theory, proposed by Thomas Young in 1802 and extended by Hermann von Helmholtz in 1852, suggests that color vision is based on three types of cone receptors in the retina. These cones are sensitive to different but overlapping ranges of wavelengths corresponding to red, blue, and green.
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...
01:20Anatomy 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.
01:22Photoreceptors 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...
02:00Photoreceptors and Plant Responses to Light
Light plays a significant role in regulating the growth and development of plants. In addition to providing energy for photosynthesis, light provides other important cues to regulate a range of developmental and physiological responses in plants.