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The mechanisms for this type of conditioning are probably the same in humans. According to PET scans on young adults, when pairing a stimulus with an airpu produces a conditioned eye blink, activity increases in the cerebellum, red nucleus, and several other areas (Logan & Grafton, 1995). People who have damage in the cerebellum have weaker conditioned eye blinks, and the blinks are less accurately timed relative to the onset of the airpu (Gerwig et al., 2005).