How can the nervous system represent increases in the intensity of a stimulus?

The nervous system represents increases in the intensity of a stimulus primarily through the frequency of action potentials generated by sensory neurons. As the intensity of a stimulus increases, these neurons fire more rapidly, a phenomenon known as frequency coding. Additionally, different populations of neurons may be recruited to respond to higher intensities, enhancing the overall signal. This combination of increased firing rate and recruitment of additional neurons allows the nervous system to encode varying levels of stimulus intensity effectively.