Tekman, H. G. (2003). Effects of accenting and regularity on detection
of temporal deviations: does regularity facilitate performance?
of General Psychology, 130, 247-258.
In an experiment on the effect of intensity accents on perception of time
intervals between tones Tekman (2001) had found that regular placement of
deviant time intervals in short sequences of tones reduced detection, especially
if intensity accents marked the deviant time intervals. This was the opposite
of what one would expect on the basis of the dynamic attending theory of
M. R. Jones (1976). The effect could have been due to the fact that temporally
deviant tones created cumulative onset shifts that affected all the following
tones. If the deviations were randomly placed, they could follow each other
in close succession and change the local tempo. In the present experiment,
these changes of local tempo, which could have acted as a cue for detection
of temporal deviations in the random sequences, were eliminated by compensating
for deviant time intervals by equal deviations in the opposite direction
in the following interval. With this change in the stimuli the negative
main effect of regularity was eliminated and accenting interacted with regularity
in favor of detection in the regular sequences. A simple advantage of regular
over random sequences was not observed, however. Possible reasons for lack
of a facilitatory effect of regularity are discussed.