Mean d′ values (and standard errors) across the seven subjects in test trials with the third (left two bars) and with the fourth (right two bars) harmonic mistuned in the unreliable (white bars) and reliable (black bars) context conditions. The standard errors are based on normalized data—to equate the mean performance across listeners—as inter-subject variance is irrelevant for within-subjects designs (Loftus and Masson 1994).