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Procedure and Blaisdell et al.'s [1] prediction.
| group | phase 1 | phase 2 | test | prediction |
|---|---|---|---|---|
| RI (response independent) | light, then tone | light, then food | tone (yoked to LD) | default response levels |
| LD (lever dependent) | light, then tone | light, then food | lever produces tone | reduced response levels |
