One of the most persistent and damaging myths in legal proceedings involving survivors of trauma is this: that a credible witness tells their story consistently, chronologically, and without gaps.
This expectation is deeply embedded in how legal systems evaluate evidence. It is also neurologically incorrect.
The way traumatic memory is stored, accessed, and narrated is fundamentally different from the way ordinary autobiographical memory works. When legal and assessment processes fail to account for this, the cost is borne by survivors whose credibility is questioned, whose claims are dismissed, and whose experience is reframed as unreliable - when in fact it is entirely consistent with the science of trauma.
During a traumatic event, the brain's threat-response system - centred on the amygdala - takes precedence over the prefrontal cortex, which governs linear reasoning and narrative organization.1 Memory encoding under these conditions is fragmentary, sensory-dominant, and non-sequential.
This is not a dysfunction. It is an adaptive feature of human neurobiology. The brain under threat prioritizes survival information - sensory details, emotional valence, threat signals - over the construction of a coherent narrative.
The result is that traumatic memories are frequently stored in fragments: a smell, a sound, a physical sensation, an image - without a clear contextual timeline. They may resurface involuntarily and unpredictably. They may be inaccessible in some contexts and overwhelmingly present in others.
Dr. Bessel van der Kolk's foundational research - first published in the Harvard Review of Psychiatry in 1994 and expanded in the Trauma Research Foundation's ongoing work2 - documented that traumatic memories are initially imprinted as sensory and emotional states, with limited capacity for verbal representation. This research, further developed by Dr. Jim Hopper of Harvard Medical School,3 has established that the neurobiological basis of fragmented trauma memory is not contested science.
Despite this evidence, credibility assessments in legal proceedings frequently apply a standard that penalizes the very symptoms that define traumatic memory. Survivors are questioned about why they cannot remember the exact date. Why they did not disclose immediately. Why their account of events appears inconsistent across tellings. Why they seemed calm when describing severe abuse.
Each of these features - delayed disclosure, emotional numbing, inconsistent chronology, fragmented recall - is well-documented in the trauma literature as a characteristic response to traumatic experience, not an indicator of fabrication.
Statistics Canada's Survey on Mental Health and Stressful Events confirmed that 8% of Canadian adults meet the criteria for probable PTSD4 - yet among those who sought professional help, 82% reported barriers to accessing the services they needed.5 This gap between prevalence and access makes the quality of medico-legal assessment all the more consequential.
This is precisely where the quality of psychiatric and psychological assessment becomes consequential.
A trauma-informed expert pproaches memory not as a test of consistency but as a clinical phenomenon requiring interpretation. Non-linear recall is documented, contextualized, and explained - not flagged as a credibility concern. The expert understands that how a survivor narrates their experience in an assessment context is itself data about the nature of their trauma.
A conventional assessment that does not apply this lens risks producing a report that unintentionally undermines a survivor's credibility - not because the survivor's account is unreliable, but because the experts framework cannot accommodate the reality of traumatic memory.
Legal professionals referring survivors for assessment should understand that the methodological choices made in the assessment process have direct implications for the quality and defensibility of the resulting report.
Questions worth asking when selecting an assessment provider include:
Does the expert have specific training in trauma neurobiology?
Does the assessment methodology account for the impact of trauma on memory and disclosure?
Will the report contextualize the survivor's presentation within current clinical understanding?
At MindSense, these are not peripheral considerations. They are built into the design of every assessment we conduct.
References
1. Hopper, J.W. (2020). Important Things to Get Right About the 'Neurobiology of Trauma.' End Violence Against Women International. For a detailed explanation of amygdala and prefrontal cortex interaction under threat, see also: Hopper, J.W. (2016). The Impact of Trauma on Brain, Experience, Behavior and Memory. Harvard Medical School / Massachusetts Department of Higher Education. Available at: https://jimhopper.com/topics/sexual-assault-and-the-brain/
2. van der Kolk, B.A. (1994). The body keeps the score: Memory and the emerging psychobiology of posttraumatic stress. Harvard Review of Psychiatry, 1(5), 253–265. See also: van der Kolk, B.A. The Body Keeps the Score: Brain, Mind, and Body in the Healing of Trauma. New York: Viking, 2014. Trauma Research Foundation: https://traumaresearchfoundation.org/
3. Hopper, J.W. & van der Kolk, B.A. (2001). Retrieving, assessing, and classifying traumatic memories: A preliminary report on three case studies. Journal of Aggression, Maltreatment, and Trauma. See full publications list at: https://jimhopper.com/publications/
4. Statistics Canada. Survey on Mental Health and Stressful Events, 2021. The Daily, 20 May 2022. Available at: https://www150.statcan.gc.ca/n1/daily-quotidien/220520/dq220520b-eng.htm
5. Statistics Canada. Survey on Mental Health and Stressful Events, 2021. Among those who met criteria for probable PTSD and sought professional help, 82% reported trouble accessing the health care services they needed. Available at: https://www150.statcan.gc.ca/n1/daily-quotidien/220520/dq220520b-eng.htm. See also: Cheung, A.H., et al. (2022). Barriers to care for mental health conditions in Canada. PLOS Mental Health. Available at: https://pmc.ncbi.nlm.nih.gov/articles/PMC12798298/