Answer:
Law of specific nerve energies
Explanation:
According to my research on studies conducted by Johannes Muller, I can say that based on the information provided within the question Muller called this the Law of specific nerve energies. Like mentioned in the question this law states that the nature of perception is defined by the nerve over which the sensory information passes through. Therefore what stimulated a sensation is not important instead what nerve is stimulated is what actually matters.
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