Retrieving a consolidated memory can trigger different processes, such as memory reactivation by the reminders presented during acquisition. Only a few reports have shown that memory modification might occur earlier than the declarative changes associated with the aversive stimuli. We designed a differential threat-conditioning protocol, the association of an angry face conditioning stimulus (CS+) with an aversive tone unconditioned stimulus (US), combined with declarative tasks to analyze the interplay between implicit memory and cognitive bias, as well as their temporal dynamics. We performed two experiments: 1 or 2 CS+ presentations (1R or 2R) during the reactivation session, evaluating their effects 48 hs or 3 weeks after acquisition. Declarative results indicated evidence of learning and retention in both groups. In the 1R group, CS+ showed an increase in reported aversiveness 48 hours after acquisition, which was not sustained over time. In contrast, CS– exhibited a consistent decrease in aversiveness across assessments. In the 2R group, no changes were observed for CS+ before or after conditioning, whereas CS– showed a decrease in aversiveness 48 hours after acquisition that persisted at the three-week follow-up. The results indicate that both the temporal dynamics and the number of reminders influence stimulus representations. Further analyses are required to determine whether the aforementioned variables also have an effect on implicit memory.