The results from Experiment 1 expressed as target-to-masker ratio (T/M) in dB. The data are group means and associated standard deviations for the target-masker spatial separations that were tested. The left panel shows the results when target and maskers were filtered equally. The right panel shows the results when the maskers were broadband and only the target was filtered. In both panels, the data for different frequency regions are indicated by the different symbols. The data points are offset slightly along the abscissa and connected by lines for clarity of presentation.
The amount of “spatial release from masking” (SRM) computed from the values plotted in Fig. 1. The abscissa is the frequency range and the left bar of each pair is when both target and masker were filtered equally while the right bar of each pair indicates SRM when only the target was filtered (see text).
The results of Experiment 2 plotted as T/M at threshold for one masker (left panel) and for two maskers (right panel) of the same type. The spatial configurations are indicated along the abscissa. The individual functions with different symbols in each panel represent the type of masker (see legend). The data points are offset and connected only for clarity of presentation.
The increase in masking obtained when two masker sources are present compared to one masker (ordinate). The abscissa is the masker type and for each type the left bar is for the colocated presentation and the right bar is for the separated presentation. The dashed line at 3 dB indicates the increase in threshold T/M expected based simply upon the increase in overall masker level from combining two uncorrelated equal-level maskers.
Spatial release from masking for the conditions displayed in Fig. 3. The ordinate is the amount of SRM in dB and the abscissa is the type of masker that was present. The left bar of each pair is for a single masker while the right bar of each pair is for two maskers.
Results from the mixed masker and mixed separation conditions (see text). The left panel shows the threshold T/Ms while the right panel shows the resulting SRM for each condition. The values for two maskers of the same type (speech or noise) are replotted from Figs. 3 and 5.
A listing of the stimuli and conditions tested in Experiment 2. The conditions that were not tested are indicated by DNT (did not test) and the conditions that were not applicable because only one masker was present are indicated by N/A.
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