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. Author manuscript; available in PMC: 2011 Nov 17.
Published in final edited form as: Brain Res. 2010 May 24;1345:156–163. doi: 10.1016/j.brainres.2010.05.048

Table 2.

Mean (± SEM) freezing rates during the three intervals of the trial epoch, averaged across four tone-CS trials for paired and unpaired groups of mice during day 3 Unit: %.

Group Strain Pre-CS CS Trace
Paired C57BL/6 37.29±8.66 43.54±4.43 84.17±3.67
DBA/2 15.63±5.40 11.67±5.69 36.25±6.68
Unpaired C57BL/6 34.17±6.54 26.46±3.35 54.17±4.13
DBA/2 5.83±2.37 5.21±1.55 16.67±4.07

During day 3, both the paired group and the unpaired group received four tone-CS trials. Trial periods: (Pre-CS) period prior to tone-CS presentation (20-s interval); (CS) period of tone-CS presentation (40-s interval); (Trace) encompasses the empty trace interval until the shock occurred during training (60-s interval).