An important aspect is the regional differences in our visual perception: the central visual field is color-sensitive, has high acuity vision, operates at high levels of illumination whereas the periphery is more sensitive at low levels of illumination, is relatively color insensitive, and has poor visual acuity. The chapter will familiarize you with measures of visual sensation by discussing the basis of form perception, visual acuity, visual field representation, binocular fusion, and depth perception. Just as no human face is the same, neither is a human nose.In this chapter you will learn about how the visual system initiates the processing of external stimuli. It is this olfactory ability which plays a major role in the way we individually experience the world – as one of our five sensory experiences. They activate receptors that transmit chemical signals to the olfactory bulb, a central processor in your brain that registers the scent. When you walk past a smell, molecules of that scent enter your nose and waft over an olfactory sensor at the top of the nasal cavity. The average human nose can detect more than 10,000 scents, which plays a major role in the way we experience the world, and why sometimes we have different experiences of the same thing! Unlike other neural signals such as sight and touch which go through a brain relay station, smell is the only scent that directly links to the brains hippocampus (memory formation) and amygdala (emotion and memory processing centre).
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