The specificity of a receptor for a particular stimulus is known as the Law of specific nerve energies . Sensory pathways carry information to the CNS integrating centres (Fig. 10-2) Primary sensory neurons --- secondary sensory neurons (interneurons) --- tertiary sensory neurons … etc. sensation = awareness of some sensory information, ex = loud sounds perception = putting sensation (sensory information) into context (requires integrating past experience or knowledge), ex = loud sounds are actually someone yelling to get out of the way - same type of receptor can overlap with others of the same type (the greater the overlap, the greater the receptor density) and/or receptors sensitive to different stimuli can overlap with each other sensory unit : the afferent neuron and all its associated receptor endings (Fig. 10-2) receptor field : that part of the body when activated (touched, heated) that results in a particular sensory unit being stimulated Two-point discrimination (Figure 10-3)
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