Tracing memory suppression and transformation: interplay of cognitive, neural, and cultural dynamics

Episodic memory plays a fundamental role in shaping cognition, identity, and decision making, yet it is not a fixed record of past experiences and can be actively modified through various cognitive processes. What people remember about their own lives, and what they report to others, is shaped by processes that weaken, block, or displace competing traces. This narrative review integrates three related but distinct forms of forgetting: denial induced forgetting (DIF), retrieval induced forgetting (RIF), and suppression induced forgetting (SIF). For each, we summarize the behavioral evidence, the available neurophysiological markers, and the implications for criminological, clinical, and cultural questions. DIF, a comparatively recent phenomenon, shows that repeatedly denying details of an experienced event can undermine later memory for the interview in which the denial occurred, and sometimes for the event itself, yet it currently lacks direct neurophysiological evidence. RIF and SIF are better characterized in terms of neuro-electrophysiological activity, with converging work on prefrontal control, theta and alpha/beta oscillations, and hippocampal down-regulation. We propose that the three phenomena can be conceptualized along a continuum from incidental to intentional memory control, while recognizing that their underlying mechanisms may differ. Their forensic relevance lies in how testimony is elicited and evaluated, and cultural norms may shape when, how, and why people deny, selectively retrieve, or suppress memories. We close by identifying gaps in ecological validity, neural evidence for DIF, the separation of voluntary and involuntary control, and cross-cultural work, and by proposing multimodal, interdisciplinary research to address them.