Reference:Moore, Glasberg, Peters (1986)
The Mistuned Harmonic paradigm explores how the auditory system groups concurrent sounds.
Normally, harmonics of a fundamental frequency (f0) are fused into a single perceived tone.
However, if one harmonic is shifted in frequency (mistuned), it "pops out" and is heard as a separate tone.
This test determines the threshold of mistuning required for this segregation to occur across different harmonics and frequencies.
Parameters
Stimuli
▼ Experiment
Note: This section is an approximation for illustration. It is not the original experimental setup described in the reference but serves to provide a feel for the psychoacoustic effects at play.
▼ How to
Press "Start" to start a "Best of 5" demonstration experiment with the given fundamental frequency.
The demonstration starts with a mistuned harmonic index of 1 and a mistuning level of 5%.
Mistuning can apply to sounds, which can cause them to be perceived as two sounds.
For each sound, judge whether you hear one or two sounds.
Outcome Logic:
5a. Progress Misstuning: After perceiving mistuned as "two" or normal as "one" 4 out of 5 trials, the mistuning level is lowered.
5b. Progress Harmonics: Otherwise the mistuning resets to 5% and the harmonic index is increased.
The harmonic indexes of 1, 3, 5 are tested.
Try to detect whether the first or second of two tones is mistuned in a simplified best-of-5 experiment:
