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Habituation is a simple form of learning in which the strength of a response to a certain stimulus becomes weaker with repeated presentation of that stimulus. Habituation is not a result of an inability of either sensory neurons or motor neurons to produce action potential. In habituation, the excitatory postsynaptic potential in motor neuron becomes smaller. This is due to the fact that motor neurons are receiving a less neurotransmitter across synapse. This decrease in neurotransmitter occurs because calcium channels have become less responsive to the voltage changes associated with action potentials, causing a reduction on the influx of calcium needed to release neurotransmitter. In habituation, changes take place in calcium channels. Sensitization is a process by which the response to a stimulus increases with repeated presentation of that stimulus. Serotonin interneuron that makes a pre-synaptic connection with a sensory neuron releases serotonin. Serotonin reduces K+ efflux through potassium channels, thus prolonging the action potential. The prolonged action potential results in a greater calcium influx and therefore increased rel