One of the most complex eyes in the animal kingdom can be found in species of stomatopod crustaceans (mantis shrimp), some of which have 12
different photoreceptor types, each sampling a narrow set of wavelengths ranging from deep ultraviolet to far red (300 to 720 nanometers)(1 — 3).
The team discovered that the vibrant light from the breast feathers selectively activates
different photoreceptors in the female birds» eyes as the colors change.
Not exact matches
The downside is that people with these eye diseases are losing sight in large part because they're losing a
different type of eye cell: the
photoreceptors that sense light in the retina.
Instead of the brain computing a colour based on the numerical ratio of
different colour amounts detected by the
photoreceptors, the
photoreceptors respond in a particular pattern, which is then sent to the brain.
Like many animals, humans have three kinds of
photoreceptors in their eyes, each sensitive to a
different colour.
In
different sets of photographs, the scientists developed software that replicated how colors look under
different types of color vision, including
different types of color blindness, and the type of trichromatic vision seen in many artificial systems, with even spacing of the green and red
photoreceptors.
Retinas are built of a stack of
different types of neurons, each connected by synapses that transmit signals from
photoreceptors to the brain.
By allowing the plants to regulate the change from the active to the inactive state, they can adapt the photosensitivity of the phytochrome B
photoreceptor to
different conditions.
A good example of compartmentalization is observed in a specialized type of light - sensing neurons found in the retina, the
photoreceptors, which are made up of
different compartments containing specific proteins essential for vision.
Part of the process of seeing color is that three
different kinds of
photoreceptors in the eye are tuned to three overlapping families of color: red, green and blue (which are activated by visible light of long, medium and short wavelengths).
Only larger stimuli covering far more than one cell's receptive field — the area where a bipolar cell collects
photoreceptor inputs — generated
different signals across multiple channels.
But if the animal adds a second
photoreceptor with
different absorption properties, then by comparing both receptors, the red and green lights could always be distinguished.»
In addition to this, the gene duplicates in zebrafish display strikingly
different expression during the day - night cycle, presumably to allow efficient regulation of
photoreceptor cells under dramatically
different light conditions.
Neves confirmed that MANF is indeed upregulated in response to retinal damage in both the fly and the mouse, and protects
photoreceptors from
different types of damage.
The eyes contain two
different types of
photoreceptor cells that affect the way everyone sees things, and this is true of both dogs and people.