Title: Tonal Stimuli

Source: Levelt, Geer, and Plomp (1966)

Description: Two data sets on tonal stimuli; the first one contains
similarity data, the second one the hypothesized data. The data are similarity
coefficients for tonal stimuli. Each stimulus consisted of two
simultaneously heard tones with a fixed ratio between their
frequencies. Fifteen stimuli were used: the twelve musical intervals
within the octave; and in addition two wider intervals (4:9 and 2:5)
and one narrow interval between minor and major second (11:12). To
control for pitch effects, the mean frequency for each interval was
held constant at 500 Hz.

The items are as follows:

Freq. Ratio 	No. (=variable name)
15:16		15
11:12		13
8:09		12
5:06		7
4:05		6
3:04		3
5:07		9
1:02		2
5:08		10
3:05		5
4:07		8
8:15		14
1:02		1
4:09		11
2:05		4