The frequency of the A440 or Stuttgart pitch is 440 Hz. I wonder to what extent people are able to differentiate between the correct pitch height and increasingly further deviations from this standard. I'm looking for academic studies that lay out to what extent people can tell the difference between, say, 440 Hz and 440.1 Hz, 441 Hz or 442 Hz.
It would be great if the academic studies would go into:
- Professional musicians, hobby musicians and people who haven't played any musical instruments in their life. To what extent do their musical abilities affect their ability to detect (subtle) deviations to the pitch of the notes?
- To what extent the speed at which the notes are played sequentially affects peoples' abilities to detect these deviations.
- Whether or not there are major differences between people that are used to the classical Western note scales and people who are used to different scales.
- If the ability to detect deviations also depends on the frequency of the note itself? Are people better at detecting deviations from an A440 Hz note, or a C2093 note? Why?
Moreover, I'd be interested in graphs that depict what proportion of a large population is able to detect a frequency deviation of, say, 0.01%, 0.1%, 1% and 10% of frequency of a given note.