you see with your brain not with your eyes Defend this statement with reference to the Young-Helmholtz theory of color vision and the optic disc
http://en.wikipedia.org/wiki/Young%E2%80%93Helmholtz_theory
http://psychology.about.com/od/yindex/g/def_trichrom.htm
The statement "you see with your brain not with your eyes" can be defended by referencing the Young-Helmholtz theory of color vision and the optic disc.
The Young-Helmholtz theory, also known as the trichromatic theory, suggests that our perception of color is based on the activity of three different types of color receptors in our eyes - red, green, and blue cones. These cones are specifically sensitive to different wavelengths of light. When light enters our eyes, it stimulates these cones, and the information is then transmitted to the brain for further processing.
However, the neural processing of visual information does not solely occur in the eyes. After the initial activation of the cones, the signals are sent through the optic nerve, which carries the information to the brain's primary visual cortex. This is where the interpretation and perception of visual stimuli take place.
The optic disc, also known as the blind spot, plays a role in supporting the statement as well. It is a small region in the retina where the optic nerve exits the eye. Interestingly, there are no photoreceptor cells (rods or cones) present in this area. As a result, we are not able to perceive any visual information at the blind spot. However, our brain compensates for this lack of photoreceptors by filling in the missing information based on the surrounding visual scene.
Therefore, when it comes to vision, the eyes act as a complex optical apparatus that transmits light to the brain. The brain processes this information, interprets it, and constructs our perception of the visual world. Thus, the statement "you see with your brain not with your eyes" is justified based on the Young-Helmholtz theory of color vision and the role of the optic disc.
The statement "you see with your brain not with your eyes" can be defended by referring to the Young-Helmholtz theory of color vision and understanding the role of the optic disc.
The Young-Helmholtz theory, also known as the trichromatic theory, suggests that there are three types of color receptors or cones in our eyes: red, green, and blue. According to this theory, when light enters our eyes, these cones are activated to different degrees, and the combination of their stimulation determines the perception of color. This theory helps explain how our eyes detect and process different colors.
However, it is important to note that perception goes beyond the mere detection of light and its wavelengths. The brain plays a crucial role in processing and interpreting the signals received from the eyes. The raw information captured by the cones is sent to the brain via the optic nerve, where further processing occurs.
The optic disc, also known as the blind spot, is a part of the eye where the optic nerve exits the retina and there are no light-sensitive cells present. This means that light cannot be detected or seen by the eye at this specific point. However, we do not perceive a gap or darkness in our visual field corresponding to the blind spot. The reason is that the brain compensates for this missing information and fills in the gap based on the surrounding visual information.
This phenomenon suggests that our perception of the visual world is not solely dependent on the information received by the eyes but is influenced and shaped by the processing and interpretation that occurs in the brain. Therefore, we can argue that "seeing" involves not only the functioning of the eyes but also the involvement of the brain in organizing and constructing our visual experience.
In summary, the Young-Helmholtz theory of color vision highlights the role of the eyes in detecting light and its wavelengths. However, the optic disc and the brain's ability to fill in missing information, as well as process and interpret visual signals received from the eyes, support the assertion that "you see with your brain not with your eyes."