One such re-test involved Peretz's (2003) melodic tasks, which assessed the integrity of tonal, contour and intervallic processing by systematically manipulating a critical pitch in one melody of a pair (see Figure 2.2). The critical pitch manipulation for the Contour, Interval, and Tonality tasks created contour-violated, contour-preserved but interval-violated, and scale-violated alternate melodies respectively. Each task comprised 30 items requiring a "same" or "different" response.
Consistent with Beckwith's (2003) findings, MR performed below the controls on the Interval and Tonality tasks, but performed within the normal range on the Contour task (see Table 2.2), suggesting preserved contour representation.
Table 2.2
Percentage of Correct Responses for Peretz's (2003) Melodic Tasks
| Discrimination Task | MR's previous percentage correct (Beckwith, 2003) | MR's current percentage correct | Controls percentage correcta Mean (SD) |
|---|---|---|---|
| Contour | 73.33% | 83.33% | 91.33% (6.91) |
| Interval | 43.33%*** | 66.67%** | 88.67% (6.91) |
| Tonality | 53.33%*** | 53.33%*** | 88.87% (4.47) |
a Data based on six controls, matched for age and sex to MR, from the norms for the Montreal Battery of Evaluation of Amusia (Peretz, 2003) **p < 0.01, ***p < 0.001
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