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The type of nerve fibers primarily responsible for touch sensation are A beta fibers. These fibers are myelinated, which allows for fast conduction of signals, and they are large in diameter, making them well-suited for transmitting tactile information from the skin to the central nervous system. A beta fibers specifically relay information about light touch and pressure, contributing significantly to our ability to perceive textures and fine details.

A alpha fibers, while important for proprioception and motor functions, are not primarily responsible for touch sensation. C fibers are unmyelinated, slower, and are more related to pain and temperature sensation rather than touch. Type Ia fibers are sensory receptors related to muscle spindle activity and are more involved in detecting changes in muscle length and proprioception. Thus, understanding the roles of different nerve fiber types is crucial for grasping how sensory modalities are perceived.