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Each type of the principal type of sensation that we experience pain , touch, sight ,sound and so forth is called modalities of sensation. We experience these different modalities of sensation, while nerve fibers transmit only impulses.

How is it that different nerve fibers transmit different modalities of sensation?

1. Each nerve tract terminates at a specific point in the CNS, and the type of sensation is determined by the point in the nervous system to which the fiber leads. So touch stimulus is carried by nerve impulses in the touch area of the brain. Similarly fibers from the eyes (retina) terminates in the "visual Corteses" of the brain, touch stimuli carried by nerve impulses in the "touch" area of the brain.

2.Moreover, each receptor organ is specialized to receive a particular type of stimuli and this is carried to the particular area of the bran.

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