Fig 4. MRR stimulation led to the late-onset development of conditioned fear.

A. Freezing by MRR-conditioned mice one and seven days after MRR-conditioning (day 2 and 8 of the study). The MRR was stimulated on day 1. B. Freezing by intact mice submitted to shock-conditioning on day 2 and 8. * p<0.05 significant difference from stimulation or location/no-shock controls.