On cognitive mechanism of the eyes: the sensor vs. the browser of the brain

In neuropsychology it is commonly recognized that 70% of all the sensory receptors in the brain are inputted from the eyes. However, an important internal cognitive function of the eyes as the perceptual browser of the memory and the mind has not yet been recognized. This paper contrasts the cognitive mechanisms of the eyes as both the sensor of the brain externally and the browser of the mind internally. The key assertion is that the eyes function as a bi-directional organ: a visual sensor of the brain, more important, a perceptual browser of the mind. The sensory of the brain can be categorized into external and internal senses. The former encompass vision, auditory, smell, tactility, and tastes. The latter refers to perceptivity that forms the sixth sense of the brain. The perceptual sense encompasses consciousness, memory searching, motivation, willingness, goal setting, emotion, sense of spatiality, and sense of motion. The reveal of the internal perceptual mechanisms of the eyes is not only theoretically significant to identify the physiological organ of the thinking engine of the brain, but also practically useful to explain a wide range of cognitive mechanisms of he brain and mind.