The lens, which is located behind the pupil, further focuses the light and helps the eye to automatically focus on objects. The light then reaches the retina at the back of the eye, where images are converted into electronic signals that are transmitted to the brain through the optic nerve.
Are receptor cells contained in the retina?
Receptor cells on the retina are excited or inhibited by the light and send information to the visual cortex through the optic nerve. The retina has two types of photoreceptor cells: rods , which detect brightness and respond to black and white, and cones, which respond to red, green, and blue.
Where do sound vibrations get transformed into neural signals that can be sent to the brain multiple choice question?
The air-filled middle ear transforms sound waves into vibrations, protecting the inner ear from damage. The fluid-filled inner ear transduces sound vibrations into neural signals that are sent to the brain for processing. The cochlea is the major sensory organ of hearing within the inner ear.
What is the name for the concept that certain neurons in the visual cortex?
Feature Detection . Concept that certain neurons in the visual cortex are activated only by specific patterns. Trichromatic Theory of Color Vision.
What part of the eye where visual images are converted to electrical impulses?
The optic nerve sends visual information from the retina to the brain. The retina is the light-sensitive tissue at the back of the eye. The retina instantly converts light, or an image, into electrical impulses. The retina then sends these impulses, or nerve signals, to the brain.
What pathway does light take through the eye?
Light enters the eye through the cornea. This is the clear, dome-shaped surface that covers the front of the eye. From the cornea, the light passes through the pupil . The iris, or the colored part of your eye, controls the amount of light passing through.
How are images projected onto the retina?
The images we see are made up of light reflected from the objects we look at . This light enters the eye through the cornea, which acts like a window at the front of the eye. ... Because the front part of the eye is curved, it bends the light, creating an upside down image on the retina.
What cells help you see color?
The retina is covered with millions of light sensitive cells called rods and cones. When these cells detect light, they send signals to the brain. Cone cells help detect colors. Most people have three kinds of cone cells.
What is the part of the retina where vision is best called?
The retina is the paper-thin tissue that lines the back of the eye and contains the photoreceptor (light sensing) cells (rods and cones) that send visual signals to the brain. The pit or depression within the macula, called the fovea , provides the greatest visual acuity.
What theory states that there are three types of cones in the eye?
Hermann von Helmholtz developed the theory further in 1850: that the three types of cone photoreceptors could be classified as short-preferring (violet), middle-preferring (green), and long-preferring (red), according to their response to the wavelengths of light striking the retina.
Which theory of hearing explains how sounds up to 4000 hertz reach the brain?
How are higher and lower sounds detected? The frequency theoryof hearing states that as pitch rises, nerve impulses of the same frequency are fed into the auditory nerve. This explains how sounds up to about 4000 hertz reach the brain.
Are bent by the vibrations entering the cochlea and send a neural message to the brain?
Hair Cells : Tiny cells covering the basilar membrane that, when bent by the vibrations entering the cochlea, the cells send a neural message to the brain. Vestibular System: Which responds to the pull of gravity and allows us to maintain our balance. It is mainly formed by the SEMICIRCULAR CANALS.
What triggers a neural signal in the ear?
As the hair cells move up and down, their bristly structures bump up against an overlying membrane and tilt to one side . This tilting action causes pore-like channels, which are on the surface of the bristles, to open up. When that happens, certain chemicals rush in, creating an electrical signal.
Where is the visual cortex located in the brain?
The primary visual cortex is found in the occipital lobe in both cerebral hemispheres.
Why is the visual cortex at the back of the brain?
The visual cortex is located in the occipital lobe of the brain and is primarily responsible for interpreting and processing visual information received from the eyes . The amount of visual information received and processed by the visual cortex is truly massive.
What part of the brain controls visual processing?
Most visual functions are controlled in the occipital lobe , a small section of the brain near the back of the skull. But processing eyesight is no simple task, so other parts of the brain have to pitch in too.
