FIG. 2.

Percent correct performance as a function of target and masker spatial separation. Performance improves with spatial separation of the target and masker for conditions in which the subjects know the target location (“attend location,” solid line; “attend timbre and location,” dashed line) but not when they are attending to a nonspatial feature (“attend timbre,” dotted line). The across-subject mean in percent correct performance is shown as a function of spatial separation between the target and masker for conditions differing in which target features are known: location, timbre and location, and timbre. Error bars show the 95% confidence intervals around the mean.