FADING OF AUTOBIOGRAPHICAL MEMORY IMPORTANCE ACROSS TIME

Aims: Autobiographical memories are often thought to derive their importance from privileged life periods. However, it remains unclear whether certain epochs are intrinsically significant, or whether subjective importance declines with temporal distance. We investigated how the perceived importance of autobiographical events changes from retrospectively estimated importance at encoding (THEN) to current importance (NOW).
Methods: Two complementary approaches were employed. In Task 1, sixteen adults (mean age = 46.2 ± 9.5 years; range: 37.6–70) recalled multiple events from seven lifetime periods. Participants rated each event's importance retrospectively (THEN) and currently (NOW). In Task 2, a separate sample (N = 33; mean age = 62 ± 10 years; range: 39–77) completed Levine's Autobiographical Interview, retrieving one paradigmatic event per period and rating its importance at THEN and NOW.
Results: Task 1 revealed systematic importance fading across all lifetime periods, with no period-specific privilege. The THEN–NOW decline increased linearly with temporal distance, demonstrating lifespan-wide erosion of subjective importance. First-retrieved events showed significantly higher importance than later-retrieved ones. Task 2 showed a converging but attenuated pattern: importance fading remained significant for childhood, while recent periods showed minimal decline. This attenuation may reflect the single-event paradigm sampling predominantly high-importance memories, reducing the dynamic range of importance change.
Conclusions: Autobiographical relevance is not anchored to privileged developmental epochs but erodes systematically with time. These findings challenge the notion of intrinsically significant life periods and suggest importance fades with distance. These results may provide insight into how memories change in the brain over time.