PSYB65H3 Chapter Notes - Chapter 8&9: Postcentral Gyrus, Sensory Neuron, Periaqueductal Gray

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15 Nov 2013
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Sensory receptors: sensory receptors are specialized cells that transduce, or convert, sensory energy (for example, light photons) into neural activity. Receptors are energy filters: we refer to people who lack receptors for parts of the usual visual spectrum as being color deficient or color- blind. There are also differences in the visual receptors of individual people who see the usual range of color. Joris winderickx and his colleagues report that about 60% of men have one form of the red receptor and 40% have another form. Hence, different people may see different reds. In the auditory system, air- pressure waves are converted into a number of forms of mechanical energy, the last of which eventually activates the auditory receptors, which then produce action potentials. In the somatosensory system, mechanical energy activates mechanoreceptors, cells that are sensitive, say, to touch or pain.

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