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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 specific form of energy of a stimulus is its modality. According to the law of specific nerve energies sensory receptors are designed to respond best to specific modalities. The modality to which the receptor responds to best is the adequate stimulus.