You see a thing. Your brain saves the film. Later you press play. That is not how it works. Your brain saves a few real pieces. It rebuilds the rest each time you remember.
reconstruction
Building a memory again from a few saved pieces. Guesses fill the gaps between them.
Here is one dinner, remembered on two days.
Before / After
Tap to see the same dinner remembered twice.
We sat by the window. The soup was warm. A friend told a long story.
Same night. The window grew. A dog appeared. The brain filled the gaps with what fit.
Sources
Ebbinghaus (1885), Memory: A Contribution to Experimental Psychology
Atkinson & Shiffrin (1968), Human memory: A proposed system
Baddeley & Hitch (1974), Working memory
Craik & Lockhart (1972), Levels of processing
Tulving (1972), Episodic and semantic memory
Bartlett (1932), Remembering
Loftus & Palmer (1974), Reconstruction of automobile destruction
McGaugh (2000), Memory — a century of consolidation
Schacter (2001), The Seven Sins of Memory
Karpicke, J. D., & Roediger, H. L. (2008). The critical importance of retrieval for learning. Science, 319(5865), 966-968. https://doi.org/10.1126/science.1152408 — read in full; source of the 80% / 36% / 33% figures the module misattributes
Cepeda, N. J., Pashler, H., Vul, E., Wixted, J. T., & Rohrer, D. (2006). Distributed practice in verbal recall tasks: A review and quantitative synthesis. Psychological Bulletin, 132(3), 354-380. https://escholarship.org/uc/item/3rr6q10c — read in full; the 254-study count is Table 1
Gobet, F., & Simon, H. A. (1996). Recall of rapidly presented random chess positions is a function of skill. Psychonomic Bulletin & Review, 3(2), 159-163. https://doi.org/10.3758/BF03212414 — abstract read; corrects the random-position claim
Gobet, F., & Simon, H. A. (1996). Recall of random and distorted chess positions: Implications for the theory of expertise. Memory & Cognition, 24(4), 493-503. https://pubmed.ncbi.nlm.nih.gov/8757497/ — abstract read; the ~50,000-chunk estimate behind the chess screen
Murre, J. M. J., & Dros, J. (2015). Replication and analysis of Ebbinghaus' forgetting curve. PLoS ONE, 10(7), e0120644. https://doi.org/10.1371/journal.pone.0120644 — read; confirms the 130-year replication
Maguire, E. A., Valentine, E. R., Wilding, J. M., & Kapur, N. (2003). Routes to remembering: the brains behind superior memory. Nature Neuroscience, 6(1), 90-95. https://pubmed.ncbi.nlm.nih.gov/12483214/ — abstract read; confirms the memory-champion scan screen
Scoboria, A., Wade, K. A., Lindsay, D. S., Azad, T., Strange, D., Ost, J., & Hyman, I. E. (2017). A mega-analysis of memory reports from eight peer-reviewed false memory implantation studies. Memory, 25(2), 146-163. http://wrap.warwick.ac.uk/83729/ — read; the real source of the one-in-three figure (30.4%, N=423)
Loftus, E. F., & Pickrell, J. E. (1995). The formation of false memories. Psychiatric Annals, 25(12), 720-725 — the one-in-four figure (6 of 24), as reported by Loftus, E. F. (1997), Creating false memories, Scientific American, 277(3), 70-75, https://staff.washington.edu/eloftus/Articles/sciam.htm (read)
Craik, F. I. M., & Tulving, E. (1975). Depth of processing and the retention of words in episodic memory. Journal of Experimental Psychology: General, 104(3), 268-294. https://doi.org/10.1037/0096-3445.104.3.268 — citation verified; the module names this study on section 8 but does not list it
Tulving, E., & Thomson, D. M. (1973). Encoding specificity and retrieval processes in episodic memory. Psychological Review, 80(5), 352-373. https://doi.org/10.1037/h0020071 — quoted on section 25, not listed
Kandel, E. R. (2012). The molecular biology of memory: cAMP, PKA, CRE, CREB-1, CREB-2, and CPEB. Molecular Brain, 5, 14. https://doi.org/10.1186/1756-6606-5-14 — citation verified via Crossref; quoted on section 16, not listed
Miller, G. A. (1956). The magical number seven, plus or minus two. Psychological Review, 63(2), 81-97 — named in the section 5 debrief and the section 7 reveal, not listed
Cowan, N. (2001). The magical number 4 in short-term memory. Behavioral and Brain Sciences, 24(1), 87-114 — named in the section 5 debrief, not listed
Chase, W. G., & Simon, H. A. (1973). Perception in chess. Cognitive Psychology, 4(1), 55-81 — the chunking-in-chess result the section 7 reveal rests on, not listed
Milner, B. (1962). Les troubles de la mémoire accompagnant des lésions hippocampiques bilatérales. In Physiologie de l'Hippocampe (pp. 257-272). CNRS — the H.M. mirror-drawing result described on section 12, not listed
Read end to end and corrected: August 10, 2026. Numbers checked: August 10, 2026.