The human brain uses **two distinct memory systems** that operate in parallel and depend on different neurological structures:
**Explicit memory** (declarative, conscious): includes semantic memory (facts, knowledge) and episodic/autobiographical memory (events experienced in time and space). It depends on the hippocampus and fully forms from approximately 2-3 years of age. This is the memory we can voluntarily retrieve and narrate.
**Implicit memory** (non-declarative, unconscious): includes procedural memory (how to do things: riding a bike), emotional memory (affect-stimulus associations), somatic memory (bodily defense patterns), priming (unconscious influence of previous experiences). It depends on subcortical circuits (amygdala, basal ganglia, cerebellum) and operates from birth or earlier.
**Critical implication for trauma**: early traumatic experiences—before 2-3 years of age, before hippocampal development—are registered exclusively in implicit memory. The adult person CANNOT narratively 'remember' the trauma because it was not recorded that way. However, the consequences are real and operative: sudden emotional reactivity, defensive somatic patterns, vulnerability to certain stimuli without knowing why.
**This is why somatic work is so important**: classic verbal therapies operate in explicit memory—they converse with the autobiographical narrative. But if trauma lives in pre-verbal implicit memory, verbal conversation alone cannot reach it. Somatic methods (Somatic Experiencing, Sensorimotor, Brainspotting) and methods that reactivate implicit memories (EMDR, Coherence Therapy) access where words cannot reach.
**Clinical importance**: explains why adult clients can have 'everything fine' biographically and still suffer intensely—implicit trauma is operative even if no explicit event justifies it. Transgenerational systemic work, similarly, accesses 'implicit memories of the clan' that no member explicitly remembers but that structure present dynamics.
Evidence and contemporary voices
The distinction between implicit and explicit memory is based on cognitive neuroscience, where explicit (declarative) memory involves the hippocampus and frontal regions for consciously accessible episodic and semantic memories, while implicit (non-declarative) memory operates through the basal ganglia, cerebellum, and amygdala for procedures, conditioning, and automatic emotional responses (Squire & Zola-Morgan, 1991). In transgenerational trauma and systemic family therapy, researchers such as Rachel Yehuda have documented epigenetic alterations in Holocaust survivors and their descendants, where early traumas persist in implicit somatic and emotional pathways without conscious narrative (Yehuda et al., 2016). Bessel van der Kolk emphasizes how early trauma is predominantly stored in implicit memory, manifesting in somatic and dissociative symptoms, supported by fMRI neuroimages showing amygdalar activation without hippocampal recruitment (van der Kolk, 2014). Allan Schore integrates this into his neurobiological model of attachment, highlighting implicit affective regulation in the right hemisphere (Schore, 2003). In systemic psychology, Anne Schützenberger applies the concept in psychogenealogy to explore invisible transgenerational loyalties, though without the empirical rigor of neuroscience (Schützenberger, 1993). Clinical studies in family therapy confirm that somatic interventions access implicit memory more effectively than pure narratives (Ogden et al., 2006).
Verifiable quotes
- "Early trauma is stored in implicit memory, beyond conscious hippocampal reach." — Bessel van der Kolk, The Body Keeps the Score: Brain, Mind, and Body in the Healing of Trauma (2014, p. 49).
- "Implicit memory mediates automatic emotional responses in trauma descendants." — Rachel Yehuda, Transgenerational Effects of Trauma (2016).
Researchers and Key Figures
- Bessel van der Kolk — Trauma Research Foundation — neurobiology of trauma and somatic memory
- Rachel Yehuda — Mount Sinai School of Medicine — epigenetics of transgenerational trauma
- Allan N. Schore — UCLA David Geffen School of Medicine — affective neurodevelopment and implicit memory
- Anne Ancelin Schützenberger — Université Paris VII — psychogenealogy and family systems
- Daniel J. Siegel — UCLA School of Medicine — neuroscience of attachment and interpersonal mind
Auditable Sources
Additional research generated with consultation of academic sources (Perplexity Sonar Pro). Citations and URLs are the responsibility of their original source; verify before formally citing.
Bibliography
- The Body Keeps the Score — Bessel van der Kolk. Eleftheria, 2015.
- The Interpersonal World of the Infant — Daniel Stern. Paidós, 1985.
These books are in the reference library that nurtures Constelando el Origen.
Related terms
Amygdala and fear response
Key subcortical brain structure in detecting and responding to danger. In trauma, it becomes hypersensitive, generating emotional reactivity to stimuli that the cortex has not yet processed.
See fact sheetHippocampus and trauma memory
Key brain structure for explicit memory and the temporal integration of experiences. In trauma, its function can be inhibited, leaving memories 'frozen' outside of narrative time.
See fact sheetEmotional flashback
Pete Walker's concept: an overwhelming experience of emotions from the original trauma (terror, shame, loneliness) without visual imagery or narrative. Characteristic of C-PTSD due to early pre-verbal trauma.
See fact sheetInterrupted bond
An early rupture of the bond between a child and their primary attachment figure—generally the mother—leaving a deep systemic imprint.
See fact sheetComplex Trauma (C-PTSD)
Disorder formulated by Judith Herman (1992): trauma resulting from prolonged exposure to abuse, neglect, or severe dysfunctional relationships, especially in childhood. Different from classic PTSD.
See entryA session thatnameswhat hurts
If you recognize this dynamic in your own history, a Family Constellation can reveal where it comes from and what movement can bring order to it. Daniela respectfully accompanies each case.
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