Pitch of ''tone doublets'' (TDs), of a sequence of two identical short
tones separated by a pause, was examined. The values of carrier frequ
encies, f(c), of the tones were between 750 Hz and 1250 Hz. Each of th
e two tones consisted of eight periods. By changing the duration of th
e pause it was possible to obtain TDs with spectral maxima above (type
TDA), below (type TDB) and at (type TDC) the f(c). Subjects adjusted
frequency (denoted here as f(p)) of a 300 ms long tone to match the pi
tch of the TDs. The medians of frequencies f(p) of pitch matches for t
he TDAs were higher than of the f(p)s for the TDBs. The difference in
the medians for the two types of TDs indicated that pitch was related
to the spectra of the TDs. However, the medians of f(p)s for the TDAs
and TDBs were not at the main maxima of their spectra. The f(p) of TDA
s was around f(c) and the pitch of TDBs was shifted toward lower frequ
encies, between the spectral main maxima and the f(c). The pitch match
es for types TDA and TDB were apart up to the pause duration of 8 ms,
and converged at the 16 ms pause. This seemed to indicate that there w
as a critical duration of the pause that separated the auditory proces
sing of the two tones of the TDs and that that pause was between 8 and
16 ms long.