uFirst
studied by Fletcher and Munson (1933).
uCalled
Fletcher-Munson Curves or Equal Loudness Contours.
lMethod:
uSubjects adjusted tone of different frequencies to
match loudness
of 1000 Hz tone
uthe
intensity of 1000 Hz tone was varied over trials.
lThus,
all tones that match a 1K Hz tone of a given intensity should all be equally
loud and connecting those on a graph of intensity by frequency should
give an equal loudness contour.