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The stimulus energy must occur within the receptor's receptive field. The stimulus energy must match the specificity of the receptor. A generator potential in the associated sensory neuron must reach threshold. The stimulus energy must be converted into the energy of a graded potential. called a transduction potential.
The previous chapter described how the light-sensitive receptors of the eye convert the image projected onto the retina into spatially distributed neural activity in the first neurons of the visual pathway (i.e., the photoreceptors).