Early place theory assumed pitch requires the fundamental frequency present in the sound wave.

Evidence

One of the earliest versions of the place theory suggests that the pitch of a sound corresponds to the place stimulated by the lowest frequency component in the sound which is f0 (Method 1 above). The assumption underlying this is that f0 is always present in sounds and the theory was encapsulated by Ohm in his second or “acoustical” law1: “a pitch corre­ sponding to a certain frequency can only be heard if the acoustic wave con­ tains power at that frequency.” — David Howard, Jamie Angus, coustics and Psychoacoustics, 858

Categorization

• DEFINE: States Ohm’s acoustical law, a core definition in pitch-perception theory that later experiments falsified.
• XREF: This is the foil to the missing-fundamental fact in 859, useful for building an explanation of perceptual construction.
• corroborated: 2 independent passages support this claim — David Howard, Jamie Angus, coustics and Psychoacoustics, 858