Tutor Marked assigment 03 - Science of the senses - Essay Example

Download file to see previous pages The different cones are sensitive to different light of different wavelength. The three cone cells are usually identified as S, M and L, which denotes short, medium and long wavelengths respectively.
As explained by the trichromatic vision theory, the brain cannot be able to figure out the different colors, since the response given to the sensed light greatly depends upon the wavelength and the intensity of the light. For this reason, the ability of perceiving the color requires interaction of two or more types of cone. The interaction between two different cones enables the brain to compare the intensity of the signals, and hence differentiating the colors.
The opponent theory puts some more lighting to the trichromatic vision theory, by stating that the cone photoreceptors are linked to produce three colors pairs which oppose. The color pairs identified by the theory are; blue/yellow, red/green, and black/white. The theory explains that, whenever one of the pairs is activated, no other can be activated at the same time. Likewise, it explains that no two members of a given pairs are visible at the same location. This is why; a person cannot see a color like ‘reddish green.’ The theory also provides an explanation for deficiencies, whereby people with dichromatic deficiency confuse colors. E.g. red and green.
The ability of the body to sense a stimulus is called sensory modality. The sensory modality is based on the five senses. For the body to sense the stimuli, the stimuli must stimulate the receptor. Once the stimuli activate the sensory system, a perception of the stimuli is done, through coding. The effectiveness of the sensory system to finger out the stimuli is greatly influenced by a number of factors, including the intensity and position of the stimuli. For better interpretation of the stimuli, several sensory are sometimes combined.
Vision sensory system can be affected by the ...Download file to see next pagesRead More