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Listeners were asked to identify 295-ms synthetic CVs (45-ms transitions + 250-ms steady states) in the presence of monotically or dichotically competing isolated second-formant ‘bleats’ from CVs. Bleat duration was varied, by cutting back the steady-state portions, from 295-ms total to a transition alone (45 ms). This temporal variation in the bleats was chosen to focus on the extent to which ‘nonphonetic’ structural characteristics of signals determine the presence and amount of interference. Dichotic identification varied as a continuous, monotonic function of bleat duration, with greatest interference observed with the largest steady-state value and least interference for no steady state (i.e., transition alone). In contrast, monotic identification was relatively poor and constant across duration values. These results, together with an analysis of errors, lead to the conclusion that monotic interference does  not  depend on signals’ steady-state durations; consistent with other peripheral masking studies, monotic results seem, instead, dependent upon which segments of two signals are simultaneous and whether these temporally overlapping parts have energy in similar frequency ranges. In contrast, dichotic interference  does  depend on steady-state duration. This suggests dichotic interference is a form of ‘central masking’ which occurs because of the disruption of processes concerned with specifying the overall time-by-frequency characteristics of signals, independent of their interpretation as phonetic events.

Dichotic and Monotic Masking of CV Syllables by CV Second Formants with Different Steady-State Durations