Snap Shot
- The question: When a witness remembers an event, is the witness replaying a stored record, or rebuilding the event from fragments, knowledge, and later experience, and what does that mean for testimony?
- What the research shows: Remembering is reconstructive. Expectations shape what is encoded, and at recall people fill gaps with general knowledge, later information, and present beliefs; retelling an event for a purpose can shift later memory toward the retelling. The same flexibility usually preserves the gist, and details people do freely recall from real experiences are often highly accurate.
- What it does not show: Reconstruction does not mean memory is generally unreliable, that a changed account is false, or that a consistent account is true. Research cannot identify which parts of a particular witness’s account were reconstructed, and claims that each recall rewrites the original memory go beyond the human evidence.
- The law: Expert testimony on reconstruction is governed by Rule 702 and, in courts-martial, Houser; in Arizona, Chapple and Nordstrom allow general testimony and Lindsey bars opinions on a witness’s credibility. Changes in an account reach the factfinder mainly through prior inconsistent statements under Rules 613 and 801(d)(1)(A), whose federal, military, and Arizona versions differ.
- Issues for each side: Prosecutors can explain that change over time and added detail are ordinary features of memory, without presenting a polished trial account or growing confidence as proof of accuracy; defense counsel can show what a witness learned, said, and retold between the event and trial, without treating reconstruction as evidence that the core of an account is false.
Memory is often imagined as a recording that is captured and later played back. A century of research supports a different picture: a remembered event is assembled at recall from partial traces of the experience, general knowledge about how such events go, information acquired since, and the rememberer’s current beliefs. Researchers call memory constructive when it is formed and reconstructive when it is retrieved. The result is usually accurate in its main outline, but details can shift without the person noticing.
Reconstruction reaches court because testimony is given months or years after the event, after interviews, conversations, and reflection. A trial account may differ from an early statement, contain new details, or be smoother and more confident, and each feature is open to competing explanations.
This paper reviews the classic research, how present beliefs and retelling shape the remembered past, the adaptive view of reconstruction, reconsolidation, and the evidence on accuracy, then the limits of the research and the federal, military, and Arizona law on expert testimony and inconsistent statements.
The Classic Foundations: Bartlett and Neisser
The modern study of reconstruction begins with Bartlett (1932), who had English participants read an unfamiliar Native American folk tale, “The War of the Ghosts,” and reproduce it from memory, some repeatedly over months or years. Their versions became shorter and more conventional: unfamiliar elements dropped out or became familiar ones, and the story was reorganized to make sense by the participants’ own cultural standards. Bartlett argued that recall is construction guided by schemas, organized knowledge built from past experience, rather than a readout of a fixed trace. His methods were informal by modern standards, but the core observation has been confirmed many times.
Neisser (1967) likened the rememberer to a paleontologist who reconstructs a dinosaur from a few bone fragments (see Lane & Houston, 2021, pp. 17–18). Neisser (1981) later compared former White House counsel John Dean’s Senate testimony about conversations with President Nixon with the tape recordings of those conversations. Dean was often wrong about who said what and when, but largely right about the overall course and substance of events. The analysis shows both halves of reconstruction: details and wording drift while the gist can remain sound. It is a single case, but an early one that checked sworn testimony against an objective record.
Schemas and Expectations at Encoding and Retrieval
Reconstruction operates at two points. At encoding, people interpret a scene through expectations about what such scenes contain. Participants who waited briefly in a graduate student’s office later recalled objects that fit their idea of an office, some reported books that were not there, and objects that did not fit expectations were remembered less often (Brewer & Treyens, 1981). Schemas help people organize what matters but also lead them to remember what usually happens rather than what did; the Schema and Script Memory paper treats these processes in detail.
At retrieval, a person assembles an account from available fragments and fills gaps with what is plausible. Read and Connolly (2007) reviewed work showing that as delays lengthen, details that do not fit a schema are lost faster than details that do, so a remembered event becomes more typical. They also described studies in which later knowledge changed earlier memory: children reinterviewed two years after a staged interaction described it in ways the researchers attributed to their more mature social understanding (Poole & White, 1993), and participants who learned that a staged conversation ended in violence came to remember the earlier comments differently. Language can be absorbed too: participants asked how fast cars were going when they “smashed” rather than “hit” each other gave higher speed estimates and, a week later, more often reported broken glass the film did not show (Loftus & Palmer, 1974). Gap-filling can also produce wholly false items, as when people confidently remember a related word that was never on a studied list (Roediger & McDermott, 1995). The Misinformation Effect and False Memory papers treat these findings further.
How the Present and Retelling Shape the Past
Current beliefs can reshape memory for one’s own past. Ross (1989) showed that people use implicit theories about whether their attitudes and traits stay stable, and reconstruct earlier states to fit; a person who believes an attitude has been stable tends to remember a past attitude as closer to the present one than it was. Conway and Pleydell-Pearce (2000) proposed that the current self and its goals guide how autobiographical memories are built. A recent review discusses biases toward consistency, self-enhancement, and positivity and argues that they often serve adaptive purposes even when they introduce inaccuracy (Schacter et al., 2024). The psychiatrist George Vaillant, who followed the same group of Harvard men for decades in the Grant Study of adult development, observed that men who had changed in adulthood often remembered their younger selves as having been the way they later became; in his words, “maturation makes liars of us all” (Vaillant, 1977, p. 197). Vaillant was not describing deception; his point was that the remembered past had been revised to match the present.
Remembering is also social: how an account is told depends on the listener and the purpose (Pasupathi, 2001), and retelling for a purpose is not the same as trying to recall accurately (Marsh, 2007). Accuracy-focused retelling can strengthen recall; slanted retelling, repeated suggestive questioning, or exposure to others’ accounts can contaminate it (see “Remembering Changes Memory”). In a diary study, people judged about 42% of their own everyday retellings inaccurate in some way, often through exaggeration or selective emphasis (Marsh & Tversky, 2004; Lane & Houston, 2021, p. 135). Participants who retold a story from a particular perspective, such as arguing for or against a character, later recalled it in ways biased toward that perspective, even when asked to be accurate (Tversky & Marsh, 2000). Lane and Houston (2021, pp. 136–137) also describe laboratory findings that a detailed review of an event increased misattribution of suggested details and that an emotion-focused retelling increased later errors. These laboratory studies show that the slant of a retelling can matter, not that talking about an experience generally harms memory. Indeed, retelling a story conversationally, as to friends, improved next-day recall compared with not retelling it, though less than retelling it for accuracy (Harris & McDermott, 2025). The Remembering Changes Memory paper covers interviews and retelling more fully.
Reconstruction as an Adaptive Feature of Memory
Researchers increasingly treat reconstruction as a by-product of a flexible system rather than a defect. Schacter and Addis (2007) proposed that episodic memory stores elements of experience so that they can be recombined to imagine and plan for the future; remembering and imagining draw on largely overlapping brain networks. The cost is that elements of different experiences, or of imagined and real events, can be combined in error. Schacter, Guerin, and St. Jacques (2011) argued that distortions such as gist-based false recognition, imagination inflation, and incorporation of post-event information reflect usually useful processes: extracting meaning, simulating possible events, and updating memory (see also Schacter, 1999). The view cuts both ways in court. It explains why an honest witness can sincerely report a detail that did not occur, and why the same system is generally good at preserving what an experience meant and how it unfolded.
Reconsolidation: What the Evidence Does and Does Not Show
A new memory is thought to stabilize over hours (consolidation), and animal research suggests that retrieving a consolidated memory can make it modifiable again until it is restabilized (reconsolidation). In a widely cited rat study, blocking protein synthesis in the amygdala right after a fear memory was reactivated impaired that memory later (Nader et al., 2000). This is animal research with conditioned fear and does not translate directly to a witness’s memory of a complex event.
The human evidence is mixed. A critical review concluded that reconsolidation effects in people depend on specific conditions and that many findings allow alternative explanations (Elsey et al., 2018). One study argued that reactivating a memory before misinformation increased its effect through reconsolidation (Chan & LaPaglia, 2013). Later experiments found that reactivation did increase reporting of misinformation, but the original detail remained recoverable on a test designed to detect overwriting, suggesting a change in reporting rather than erasure (Rindal et al., 2016; Lane & Houston, 2021, pp. 139–140). The fair summary is that a memory may become modifiable when recalled, but how far this changes the original memory in people is debated. Testimony that each recall rewrites or erases a memory goes beyond the evidence.
The Balance: Reconstruction Is Usually Accurate in Gist
Reconstruction does not imply that memory is generally untrustworthy. Bartlett’s participants kept the basic story, and Dean was largely right about substance (Neisser, 1981). Adults who took part in complex but controlled real-world experiences and freely recalled them days to years later remembered less over time, but the details they reported were about 93% to 95% accurate across ages and delays, far above what surveyed memory scientists and other academics expected (Diamond et al., 2020). Reviews reach a similar point about initial, uncontaminated memory tests (Wixted et al., 2018), and new details in later interviews are often accurate (Lane & Houston, 2021, p. 129). Reconstruction most often affects peripheral details, wording, timing, sequence, and interpretation; it grows with delay, retelling, and exposure to other accounts, and fills gaps where encoding was weak. It is less likely to transform the central gist of a well-encoded experience, although false memory research shows that strong suggestion can lead people to remember whole events that did not occur.
Limits of the Evidence
Much of the research uses word lists, stories, slides, or short films viewed by students with no personal stake, tested after minutes to weeks. Real witnesses experience events personally, often with strong emotion, and testify after long delays filled with interviews and conversations. The laboratory shows that a process occurs and estimates its size under controlled conditions; it cannot say how large the effect was for a particular witness. Bartlett (1932) used informal methods, Neisser (1981) is a single case, and Diamond et al. (2020) used relatively neutral events that may not generalize to traumatic or contested ones. Human reconsolidation research is limited and contested. Above all, group research describes tendencies: it cannot establish whether a particular detail was reconstructed, and the research has not identified a method that reliably distinguishes a reconstructed detail from an accurate one by its vividness, confidence, or emotional tone.
Questions to Ask About This Research
When reconstruction is offered to explain a change between an early statement and trial testimony, counsel should ask whether the explanation is testable here: what in the record (recorded statements, messages, transcripts, exposure to other accounts) shows when and from what source the changed detail appeared, and what pattern would count against the explanation. When Loftus and Palmer (1974) or Roediger and McDermott (1995) are cited, counsel should ask how far filmed crashes and word lists carry to a personally experienced event, and whether the disputed detail is central or peripheral. When Tversky and Marsh (2000) is cited, counsel should ask what the witness retold, to whom, and for what purpose, since ordinary conversation can help later recall (Harris & McDermott, 2025). When an expert says memory is rewritten at each recall, counsel should ask what human evidence supports that, given Rindal et al. (2016) and Elsey et al. (2018). When Diamond et al. (2020) is cited, counsel should ask how similar its events were to this one. These questions are explained in “Reading Research Claims: A Guide for Attorneys” on this site.
Reconstruction and the Law
Federal and Military Standards
Expert testimony about reconstructive memory is governed by Federal Rule of Evidence 702, as amended December 1, 2023, under which the proponent must show the court that it is more likely than not that the rule’s requirements are met, including that the opinion reflects a reliable application of reliable methods to the case. Daubert v. Merrell Dow Pharmaceuticals, Inc. (1993) made the judge a gatekeeper, and Kumho Tire Co. v. Carmichael (1999) extended that gatekeeping obligation to all expert testimony, including testimony based on technical or other specialized knowledge. In courts-martial, Military Rule of Evidence 702 tracks the federal rule; under Military Rule of Evidence 1102, the Joint Service Committee’s 2025 compilation reflects the 2023 amendment as part of the military rule (Joint Service Committee on Military Justice, 2025), and practitioners should confirm current text. Military judges also apply the six factors of United States v. Houser (1993). Testimony on reconstruction is ordinarily general and educational; it may not be used to tell the factfinder that a particular witness’s memory is accurate or false.
Changes in an account reach the factfinder mainly through prior inconsistent statements. Under Federal and Military Rule of Evidence 613, a witness may be examined about a prior statement, and extrinsic evidence of a prior inconsistent statement is generally admissible only if the witness has an opportunity to explain or deny it. Under Federal Rule 801(d)(1)(A) as it has long stood, a testifying witness’s prior inconsistent statement may be used for its truth only if it was given under penalty of perjury at a trial, hearing, other proceeding, or deposition; an amendment approved by the Supreme Court and transmitted to Congress is scheduled to take effect December 1, 2026, unless Congress acts otherwise. It removes the oath requirement, so that a testifying witness’s unsworn prior inconsistent statement may be considered substantively; the Advisory Committee’s note, in its May 2025 report to the Standing Committee, states that any difficulties in proof can be taken into account by the court under Rule 403. Military Rule 801(d)(1)(A), as published in the 2024 Manual for Courts-Martial, retains the oath requirement; under Military Rule of Evidence 1102, a federal amendment generally amends the parallel military rule by operation of law eighteen months after its federal effective date unless the President acts otherwise, and practitioners should confirm current text. Reconstruction research bears on how such inconsistencies are weighed: an inconsistency may reflect ordinary reconstruction, a genuine memory error, or a deliberate change, and the research cannot say which.
Arizona
Arizona Rule of Evidence 702 adopted the federal formulation and the Daubert standard effective January 1, 2012, and was amended effective January 1, 2024, to conform to the 2023 federal amendment (Ariz. Sup. Ct. Order R-23-0004). State v. Chapple (1983) is Arizona’s leading case on expert testimony about the reliability of memory: excluding a qualified eyewitness expert was an abuse of discretion on its facts, while admission generally remains discretionary (State v. Nordstrom, 2001). Experts may describe general principles but may not opine on whether a particular witness is truthful (State v. Lindsey, 1986, 149 Ariz. at 475; State v. Moran, 1986). Arizona Rule of Evidence 801(d)(1)(A) has long treated a testifying witness’s prior inconsistent statement as non-hearsay without an oath requirement, so such statements may be considered for their truth; in State v. Allred (1982) the Arizona Supreme Court held that using a prior inconsistent statement as a pretext for its substantive use is an abuse of discretion under Rule 403 when the witness denies the statement, nothing corroborates it, and it is the only evidence of guilt; the court affirmed one defendant’s conviction and reversed another’s on that analysis.
Special Issues in Legal Practice
The principles described above apply with equal force to every party in a legal proceeding. The science operates the same way regardless of who is asking the questions, and the research summarized here does not by itself favor either side. What differs between the parties is not the science but the vantage point — the particular places where these issues tend to surface, and the particular errors each party is best positioned to guard against. The two summaries below identify those recurring issues. They are offered for orientation, not as litigation strategy; in every case the controlling question is what the evidence in that case will, and will not, support, and the expert’s role is to inform the trier of fact rather than to advocate for either side.
Special Issues for Prosecutors
The research supports several propositions prosecutors can legitimately present. Reconstruction is a normal feature of memory, so differences in wording, sequence, or peripheral detail between accounts given at different times are expected and are not, by themselves, signs of fabrication. Memory is usually accurate in its gist, details people freely recall from real experiences are often accurate, and new details in later interviews are often correct. Talking about an event with others is ordinary and can strengthen later recall. Prosecutors are well placed to preserve the value of a witness’s memory by ensuring that early accounts are recorded verbatim, that interviews are open-ended and non-leading, and that investigators document what information the witness received and when.
The research also counsels caution. A trial account that has become more detailed, more organized, or more confident is not, for that reason alone, shown to be more accurate, and presenting growing confidence or polish as corroboration overstates the science. Where a disputed detail first appears after the witness was exposed to another account, a slanted retelling, or suggestive questioning, the factfinder is entitled to weigh that sequence. Under Arizona’s rule, and under the federal rule once its amendment takes effect, an unsworn earlier statement may be used substantively when a witness’s account changes, but the research does not say that the earlier version is always the accurate one, and Allred illustrates the limits of relying on such a statement alone.
Special Issues for Defense
The research supports several propositions defense counsel can legitimately present. Memory is rebuilt at each recall from fragments, expectations, later information, and present beliefs; retelling for a purpose can shift later memory toward the retelling; and confidence, detail, and coherence are products of that process rather than guarantees of accuracy. Peripheral details, wording, timing, and interpretation are especially open to change, and change grows with delay and exposure to other accounts. Comparing a witness’s earliest recorded statements with later ones, and showing what the witness learned or retold in between, is a legitimate way to help the factfinder evaluate a particular account, and expert testimony can explain the general principles.
The research also counsels caution about the limits that apply to the defense. Reconstruction does not make memory generally unreliable, and the central gist of a personal experience is usually retained. An inconsistency in peripheral detail does not show that the core of an account is false, and an expert cannot tell the factfinder which details in a particular account were reconstructed; that is a credibility determination reserved to the factfinder (Lindsey). Claims that memory is rewritten or erased each time it is recalled go beyond the human evidence. The same processes apply to the accused’s own account and to defense witnesses, whose memories are also shaped by delay, discussion, and what they have learned since the event.
This paper is for educational purposes only and is not legal advice. The author is a psychologist, not an attorney; summaries of law are general and must be verified against current authority or with a licensed attorney.
References
Bartlett, F. C. (1932). Remembering: A study in experimental and social psychology. Cambridge University Press.
Brewer, W. F., & Treyens, J. C. (1981). Role of schemata in memory for places. Cognitive Psychology, 13(2), 207–230. https://doi.org/10.1016/0010-0285(81)90008-6
Chan, J. C. K., & LaPaglia, J. A. (2013). Impairing existing declarative memory in humans by disrupting reconsolidation. Proceedings of the National Academy of Sciences, 110(23), 9309–9313. https://doi.org/10.1073/pnas.1218472110
Conway, M. A., & Pleydell-Pearce, C. W. (2000). The construction of autobiographical memories in the self-memory system. Psychological Review, 107(2), 261–288. https://doi.org/10.1037/0033-295X.107.2.261
Diamond, N. B., Armson, M. J., & Levine, B. (2020). The truth is out there: Accuracy in recall of verifiable real-world events. Psychological Science, 31(12), 1544–1556. https://doi.org/10.1177/0956797620954812
Elsey, J. W. B., Van Ast, V. A., & Kindt, M. (2018). Human memory reconsolidation: A guiding framework and critical review of the evidence. Psychological Bulletin, 144(8), 797–848. https://doi.org/10.1037/bul0000152
Harris, K., & McDermott, K. (2025). The effect of social retelling on event recall. Memory, 33(2), 166–177. https://doi.org/10.1080/09658211.2024.2415907
Joint Service Committee on Military Justice. (2025). Amendments to the Military Rules of Evidence since 1984 (G. E. Maggs, Ed.; 2025 ed.). https://jsc.defense.gov/Portals/99/MRE%20Amendments%202025.pdf
Lane, S. M., & Houston, K. A. (2021). Understanding eyewitness memory: Theory and applications. New York University Press.
Loftus, E. F., & Palmer, J. C. (1974). Reconstruction of automobile destruction: An example of the interaction between language and memory. Journal of Verbal Learning and Verbal Behavior, 13(5), 585–589. https://doi.org/10.1016/S0022-5371(74)80011-3
Marsh, E. J. (2007). Retelling is not the same as recalling: Implications for memory. Current Directions in Psychological Science, 16(1), 16–20. https://doi.org/10.1111/j.1467-8721.2007.00467.x
Marsh, E. J., & Tversky, B. (2004). Spinning the stories of our lives. Applied Cognitive Psychology, 18(5), 491–503. https://doi.org/10.1002/acp.1001
Nader, K., Schafe, G. E., & LeDoux, J. E. (2000). Fear memories require protein synthesis in the amygdala for reconsolidation after retrieval. Nature, 406(6797), 722–726. https://doi.org/10.1038/35021052
Neisser, U. (1967). Cognitive psychology. Appleton-Century-Crofts.
Neisser, U. (1981). John Dean’s memory: A case study. Cognition, 9(1), 1–22. https://doi.org/10.1016/0010-0277(81)90011-1
Pasupathi, M. (2001). The social construction of the personal past and its implications for adult development. Psychological Bulletin, 127(5), 651–672. https://doi.org/10.1037/0033-2909.127.5.651
Poole, D. A., & White, L. T. (1993). Two years later: Effect of question repetition and retention interval on the eyewitness testimony of children and adults. Developmental Psychology, 29(5), 844–853. https://doi.org/10.1037/0012-1649.29.5.844
Read, J. D., & Connolly, D. A. (2007). The effects of delay on long-term memory for witnessed events. In M. P. Toglia, J. D. Read, D. F. Ross, & R. C. L. Lindsay (Eds.), The handbook of eyewitness psychology: Vol. 1. Memory for events (pp. 117–155). Lawrence Erlbaum Associates.
Rindal, E. J., DeFranco, R. M., Rich, P. R., & Zaragoza, M. S. (2016). Does reactivating a witnessed memory increase its susceptibility to impairment by subsequent misinformation? Journal of Experimental Psychology: Learning, Memory, and Cognition, 42(10), 1544–1558. https://doi.org/10.1037/xlm0000265
Roediger, H. L., III, & McDermott, K. B. (1995). Creating false memories: Remembering words not presented in lists. Journal of Experimental Psychology: Learning, Memory, and Cognition, 21(4), 803–814. https://doi.org/10.1037/0278-7393.21.4.803
Ross, M. (1989). Relation of implicit theories to the construction of personal histories. Psychological Review, 96(2), 341–357. https://doi.org/10.1037/0033-295X.96.2.341
Schacter, D. L. (1999). The seven sins of memory: Insights from psychology and cognitive neuroscience. American Psychologist, 54(3), 182–203. https://doi.org/10.1037/0003-066X.54.3.182
Schacter, D. L., & Addis, D. R. (2007). The cognitive neuroscience of constructive memory: Remembering the past and imagining the future. Philosophical Transactions of the Royal Society B: Biological Sciences, 362(1481), 773–786. https://doi.org/10.1098/rstb.2007.2087
Schacter, D. L., Greene, C. M., & Murphy, G. (2024). Bias and constructive processes in a self-memory system. Memory, 32(6), 656–665. https://doi.org/10.1080/09658211.2023.2232568
Schacter, D. L., Guerin, S. A., & St. Jacques, P. L. (2011). Memory distortion: An adaptive perspective. Trends in Cognitive Sciences, 15(10), 467–474. https://doi.org/10.1016/j.tics.2011.08.004
Tversky, B., & Marsh, E. J. (2000). Biased retellings of events yield biased memories. Cognitive Psychology, 40(1), 1–38. https://doi.org/10.1006/cogp.1999.0720
Vaillant, G. E. (1977). Adaptation to life. Little, Brown.
Wixted, J. T., Mickes, L., & Fisher, R. P. (2018). Rethinking the reliability of eyewitness memory. Perspectives on Psychological Science, 13(3), 324–335. https://doi.org/10.1177/1745691617734878
Legal Authorities
Daubert v. Merrell Dow Pharmaceuticals, Inc., 509 U.S. 579 (1993).
Kumho Tire Co. v. Carmichael, 526 U.S. 137 (1999).
State v. Allred, 134 Ariz. 274, 655 P.2d 1326 (1982).
State v. Chapple, 135 Ariz. 281, 660 P.2d 1208 (1983).
State v. Lindsey, 149 Ariz. 472, 720 P.2d 73 (1986).
State v. Moran, 151 Ariz. 378, 728 P.2d 248 (1986).
State v. Nordstrom, 200 Ariz. 229, 25 P.3d 717 (2001).
United States v. Houser, 36 M.J. 392 (C.M.A. 1993).
Fed. R. Evid. 613.
Fed. R. Evid. 702.
Fed. R. Evid. 801(d)(1)(A) (amendment approved by Supreme Court order of Apr. 8, 2026; scheduled to take effect Dec. 1, 2026).
Mil. R. Evid. 613.
Mil. R. Evid. 702.
Mil. R. Evid. 801(d)(1)(A).
Mil. R. Evid. 1102.
Ariz. R. Evid. 702.
Ariz. R. Evid. 801(d)(1)(A).
Ariz. Sup. Ct. Order R-23-0004 (amending Ariz. R. Evid. 702, effective Jan. 1, 2024).
Related topic papers: Schema and Script Memory · Gist Memory · Remembering Changes Memory · The Misinformation Effect · False Memory · Autobiographical Memory
Related topics from Arizona Forensic Services: Courts-Martial