Which of the following statements about adaptation is the most accurate? a) Adaptation is a decrease in the frequency of action potentials in an afferent neuron despite maintenance of the stimulus at constant strength. b) Adaptation, if it occurs at all, is a very rapid process. c) Adaptation is an increase or a decrease in the frequency of action potentials when a new stimulus is introduced. d) Adaptation is a decrease in the frequency of action potentials in an afferent neuron even though the stimulus intensity (strength) has increased. e) Adaptation only occurs in afferent neurons, never in receptors or the cerebral cortex.

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