Final answer:
The belief that pitch is determined by the location on the basilar membrane where the message is the strongest is called the Place theory.
Step-by-step explanation:
The belief that pitch is determined by the location on the basilar membrane where the message is the strongest is called Place theory. This theory suggests that different portions of the basilar membrane are sensitive to sounds of different frequencies. The base of the basilar membrane responds best to high frequencies, while the tip of the basilar membrane responds best to low frequencies.