Concept explainers
To review:
Perception of physical world through the brain.
Introduction:
Physical world has the light and sound of different wavelengths and frequencies. The sounds, textures and colors are perceived with the help of sensory receptors in the eyes and ears, which convey the information to the brain. These receptors act as energy filters which change the various forms of energy in the real world into the nerve impulses energy. This in turn, gives rise to different forms of sensations that help us relate to the physical reality, even if it is indirect or incomplete.

Explanation of Solution
Human perception of the reality is limited by the ability of sensory receptors for example, the same impulse received by the auditory and optic nerve will be perceived as the sound and sight respectively. In case of vision, the environment has X–rays,
Another example is human perception of cold, which happens with the help of sensory receptors in the brain that sense different levels of heat. In the real world, there are only degrees of heat. These two functions are evolutionary adaptations that help us cope with changes in the environment for example, dressing appropriately, if it gets colder and protecting ourselves with the help of sense of sight.
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Chapter 10 Solutions
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