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Subjects’ keypad responses to the reinforced conditioning trials (AX+) in (A) subjects aware of the AX+ contingency (n = 39) and (B) subjects unaware of the AX+ contingency (n = 11). The stimulus was rated as “+” when the subject believed that stimulus was paired with the airblast, “−” when the subject believed that stimulus was not paired with the airblast, or “0” when the subject did not know. **p < .01 compared with “+” response in unaware subjects.
