Tekman, H. G. (2003).  Effects of accenting and regularity on detection of temporal deviations:  does regularity facilitate performance?  Journal 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.