| NO_RESP | Trials where no response was given (boxcar of 500 ms from stimulus onset). |
| POS_OUT | Regressor aligned to the outcome for rewarded trials, duration of 500 ms. |
| NEG_OUT | Outcome of unrewarded trials (but where a response was recorded) |
| REW | Parametric regressor denoting reward amount in rewarded trials (1–10 drops), temporally aligned to POS_OUT. |
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