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Sensation and Perception Evaluate These Statements 1Colour television could produce better quality colour if they used more than three primary colours false When we are watching television light rays of different wavelengths enter our eyes Among the three primary colours of red green and blue the mixture of lights occurs in our eyes It is an additive mixture instead of a subtractive mixture The three kinds of wavelengths are combined in different proportions to produce almost any colour of lights So light of other colours is useless to combine more colours According to the Trichomatic theory there are three kinds of receptors short receptors medium receptors and long receptors on our retina which are stimulated by the three primary colours red green and blue respectively The quality of the colour is coded by the pattern of activity of the three receptors rather than by specific receptors for each colour So the receptors would function in the same way with or without a new primary colour presented 2What we perceive to exist is what actually exists debatable Perception involves both bottom-up process and top-down process For example for pattern recognition according to the Template theory the Prototype-Matching Theory and the Pendemonium Theory which are related to data-driven processing we recognize patterns relying on basic simple physical features We see what falls on our retina Features detection comes first matching follows and then recognition is done However perception is also a conceptually-driven process We use our concepts such as knowledge context schema and past experience to shape our perceptions We set up a hypothesis first then we actively search for evidence to support it For instance when we see a moving object in a field we may perceive that it is a cow even though we cannot see it clearly We set the hypothesis and extract and match features such as dots on body and a long tail with it We can never know if our
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