Episodic memory: what can animals remember about their past?
Abstract
The question of whether episodic memory, the ability to recall unique, personal experiences, is restricted to humans is a matter of current controversy. Recent work on food-storing jays suggests that several features of episodic memory may not be as exclusive to humans as previously thought. In this review we outline the critical features of episodic memory in humans, its relationship to declarative memory, and recent results revealing that jays can learn to perform a task that depends on certain features of episodic memory and can thus be considered 'episodic-like'. Finally, we compare this avian performance with a contemporary definition of human episodic memory and consider the implications for studies of hippocampal function and animal cognition.
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It is potentially impossible to establish if non-human animals have true, conscious episodic memory.
“However, as evidence for conscious episodic recall in humans is centred around language-based reports, and with there being no widely accepted non-linguistic markers of consciousness [51], it is potentially impossible to establish if non-human animals have true, conscious episodic memory.”
From Is episodic-like memory <i>like</i> episodic memory? (2024) · cites this paper as [51]
Cites
(1983) · Medical Entomology and Zoology · Cited by 6,051 · see citing works
(2007) · Cognitive Psychology · doi:10.4135/9781446212967.n15 · Cited by 3,749 · see citing works
Recognizing: The judgment of previous occurrence.
Mandler, G. (1980) · Psychological Review · doi:10.1037/0033-295x.87.3.252 · Cited by 2,753 · see citing works
Modality-Specific Retrograde Amnesia of Fear
Kim, J. J., & Fanselow, M. S. (1992) · Science · doi:10.1126/science.1585183 · Cited by 2,483 · see citing works
(1995) · Choice Reviews Online · doi:10.5860/choice.32-5931 · Cited by 2,337 · see citing works
Remembrance of places passed: Spatial memory in rats.
Olton, D. S., & Samuelson, R. J. (1976) · Journal of Experimental Psychology Animal Behavior Processes · doi:10.1037/0097-7403.2.2.97 · Cited by 1,934 · see citing works
Episodic memory, amnesia, and the hippocampal–anterior thalamic axis
Aggleton, J. P., & Brown, M. W. (1999) · Behavioral and Brain Sciences · doi:10.1017/s0140525x99002034 · Cited by 1,879 · see citing works
Differential Effects of Early Hippocampal Pathology on Episodic and Semantic Memory
Vargha-Khadem, F., Gadian, D. G., Watkins, K. E., Connelly, A., Van Paesschen, W., & Mishkin, M. (1997) · Science · doi:10.1126/science.277.5324.376 · Cited by 1,746 · see citing works
Episodic-like memory during cache recovery by scrub jays
Clayton, N. S., & Dickinson, A. (1998) · Nature · doi:10.1038/26216 · Cited by 1,464 · see citing works
Self-citationStructure and function of declarative and nondeclarative memory systems
Squire, L. R., & Zola, S. M. (1996) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.93.24.13515 · Cited by 1,327 · see citing works
The Structure and Organization of Memory
Squire, L. R., Knowlton, B. J., & Musen, G. (1993) · Annual Review of Psychology · doi:10.1146/annurev.ps.44.020193.002321 · Cited by 1,121 · see citing works
Two functional components of the hippocampal memory system
Eichenbaum, H., Otto, T., & Cohen, N. J. (1994) · Behavioral and Brain Sciences · doi:10.1017/s0140525x00035391 · Cited by 1,094 · see citing works
Fuller, T. K., & Wall, S. B. V. (1992) · Journal of Wildlife Management · doi:10.2307/3808809 · Cited by 986 · see citing works
Contemporary Animal Learning Theory.
Abrahamson, D. (1981) · Europe PMC (PubMed Central) · Cited by 945 · see citing works
Contemporary Animal Learning Theory
LoLordo, V. M., & Dickinson, A. (1982) · The American Journal of Psychology · doi:10.2307/1422669 · Cited by 891 · see citing works
Self-citationImplicit Memory: A Selective Review
Schacter, D. L., Chiu, C. Y. P., & Ochsner, K. N. (1993) · Annual Review of Neuroscience · doi:10.1146/annurev.ne.16.030193.001111 · Cited by 625 · see citing works
The hippocampus and memory for orderly stimulus relations
Dusek, J. A., & Eichenbaum, H. (1997) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.94.13.7109 · Cited by 610 · see citing works
Gaffan, D. (1994) · Journal of Cognitive Neuroscience · doi:10.1162/jocn.1994.6.4.305 · Cited by 484 · see citing works
Morris, R. (1996) · Trends in Neurosciences · doi:10.1016/s0166-2236(96)60029-0 · Cited by 479 · see citing works
An analysis of short-term visual memory in the monkey.
Mishkin, M. M., & Delacour, J. (1975) · Journal of Experimental Psychology Animal Behavior Processes · doi:10.1037/0097-7403.1.4.326 · Cited by 470 · see citing works
Organization of memory: Quo vadis?
Tulving, E. (1995) · The Cognitive Neurosciences · Cited by 399 · see citing works
Memory for items and memory for relations in the procedural/declarative memory framework
Cohen, N. J., Poldrack, R. A., & Eichenbaum, H. (1997) · Memory · doi:10.1080/741941149 · Cited by 383 · see citing works
Morris, R., & Frey, U. (1997) · Philosophical Transactions of the Royal Society B Biological Sciences · doi:10.1098/rstb.1997.0136 · Cited by 366 · see citing works
Zola‐Morgan, S., Squire, L. R., & Ramus, S. J. (1994) · Hippocampus · doi:10.1002/hipo.450040410 · Cited by 362 · see citing works
Functional organization of the hippocampal memory system
Eichenbaum, H., Schoenbaum, G. M., Young, B. J., & Bunsey, M. D. (1996) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.93.24.13500 · Cited by 304 · see citing works
A neuropsychological study of fact memory and source amnesia.
Shimamura, A. P., & Squire, L. R. (1987) · Journal of Experimental Psychology Learning Memory and Cognition · doi:10.1037/0278-7393.13.3.464 · Cited by 299 · see citing works
Long-term spatial memory in clark's nutcracker, Nucifraga columbiana
Balda, R. P., & Kamil, A. C. (1992) · Animal Behaviour · doi:10.1016/s0003-3472(05)80302-1 · Cited by 228 · see citing works
Memory, hippocampus, and brain systems.
Squire, L. R., & Knowlton, B. J. (1995) · Cited by 213 · see citing works
Species and sex differences in hippocampus size in parasitic and non-parasitic cowbirds
REBOREDA, J. C., Clayton, N. S., & Kacelnik, A. (1996) · Neuroreport · doi:10.1097/00001756-199601310-00031 · Cited by 187 · see citing works
Self-citationFood storage by black-capped chickadees: Memory for the location and contents of caches
Sherry, D. F. (1984) · Animal Behaviour · doi:10.1016/s0003-3472(84)80281-x · Cited by 183 · see citing works
Reasoning in the chimpanzee: I. Analogical reasoning.
Gillan, D. J., Premack, D., & Woodruff, G. (1981) · Journal of Experimental Psychology Animal Behavior Processes · doi:10.1037/0097-7403.7.1.1 · Cited by 169 · see citing works
How Does the Brain Organize Memories?
Eichenbaum, H. (1997) · Science · doi:10.1126/science.277.5324.330 · Cited by 162 · see citing works
Time-and-place learning by garden warblers, Sylvia borin
Biebach, H., Gordijn, M. C. M., & Krebs, J. R. (1989) · Animal Behaviour · doi:10.1016/0003-3472(89)90083-3 · Cited by 134 · see citing works
Memory for the content of caches by scrub jays (Aphelocoma coerulescens).
Clayton, N. S., & Dickinson, A. (1999) · Journal of Experimental Psychology Animal Behavior Processes · doi:10.1037/0097-7403.25.1.82 · Cited by 133 · see citing works
Self-citationSeasonal changes of hippocampus volume in parasitic cowbirds
Clayton, N. S., REBOREDA, J. C., & Kacelnik, A. (1997) · Behavioural Processes · doi:10.1016/s0376-6357(97)00050-8 · Cited by 133 · see citing works
Self-citationGaffan, D. (1992) · European Journal of Neuroscience · doi:10.1111/j.1460-9568.1992.tb00886.x · Cited by 86 · see citing works
Behavioural Brain Research in Naturalistic and Semi-Naturalistic Settings
(1995) · Springer eBooks · doi:10.1007/978-94-011-0091-5 · Cited by 82 · see citing works
Food storage, memory, and marsh tits
Sherry, D. F. (1982) · Animal Behaviour · doi:10.1016/s0003-3472(82)80080-8 · Cited by 76 · see citing works
Memory for Locations of Stored Food in Willow Tits and Marsh Tits
Healy, S. D., & Suhonen, J. (1996) · Behaviour · doi:10.1163/156853996x00035 · Cited by 45 · see citing works
Seasonal patterns of food storing in the Jay Garrulus glandarius
Clayton, N. S., Mellor, R. M. R., & Jackson, A. P. (1996) · Ibis · doi:10.1111/j.1474-919x.1996.tb04336.x · Cited by 43 · see citing works
Self-citationThe role of the hippocampus in declarative memory: A reply to Nadel
Zola-Morgan, S. M., Squire, L. R., & Ramus, S. J. (1995) · Hippocampus · doi:10.1002/hipo.450050310 · Cited by 7 · see citing works
Episodic memory, semantic memory, and amnesia
Squire, L. R., & Zola, S. M. (1998) · Hippocampus · doi:10.1002/(sici)1098-1063(1998)8:3
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Episodic memory: from mind to brain
Tulving, E. (2002) · Annual Review of Psychology · doi:10.1146/annurev.psych.53.100901.135114 · Cited by 4,950 · see citing works
Schema-dependent gene activation and memory encoding in neocortex
Tse, D., Takeuchi, T., Kakeyama, M., Kajii, Y., Okuno, H., Tohyama, C., Bito, H., & Morris, R. G. M. (2011) · Science · doi:10.1126/science.1205274 · Cited by 618 · see citing works
Can animals recall the past and plan for the future?
Clayton, N. S., Bussey, T. J., & Dickinson, A. (2003) · Nature Reviews Neuroscience · doi:10.1038/nrn1180 · Cited by 658 · see citing works
Self-citationRhesus monkeys know when they remember
Hampton, R. R. (2001) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.071600998 · Cited by 493 · see citing works
Clayton, N. S., Yu, K. S., & Dickinson, A. (2001) · Journal of Experimental Psychology: Animal Behavior Processes · doi:10.1037//0097-7403.27.1.17 · Cited by 238 · see citing works
Self-citationClayton, N. S., & Dickinson, A. (1999) · Journal of Comparative Psychology · doi:10.1037/0735-7036.113.4.403 · Cited by 227 · see citing works
Self-citationEpisodic-like memory in rats: is it based on when or how long ago?
Roberts, W. A., Feeney, M. C., MacPherson, K., Petter, M., McMillan, N., & Musolino, E. (2008) · Science · doi:10.1126/science.1152709 · Cited by 191 · see citing works
DeVito, L. M., & Eichenbaum, H. (2010) · Behavioural Brain Research · doi:10.1016/j.bbr.2009.09.014 · Cited by 164 · see citing works
Clayton, N. S., Yu, K. S., & Dickinson, A. (2003) · Journal of Experimental Psychology: Animal Behavior Processes · doi:10.1037/0097-7403.29.1.14 · Cited by 164 · see citing works
Self-citationWhat–Where–When memory in magpies (Pica pica)
Zinkivskay, A., Nazir, F., & Smulders, T. V. (2009) · Animal Cognition · doi:10.1007/s10071-008-0176-x · Cited by 139 · see citing works
Retrospective cognition by food-caching western scrub-jays
de Kort, S. R., Dickinson, A., & Clayton, N. S. (2005) · Learning and Motivation · doi:10.1016/j.lmot.2005.02.008 · Cited by 107 · see citing works
Self-citationAnimal models of episodic memory
Crystal, J. D. (2018) · Comparative Cognition & Behavior Reviews · doi:10.3819/ccbr.2018.130012 · Cited by 59 · see citing works
Episodic-like memory is preserved with age in cuttlefish
Schnell, A. K., Clayton, N. S., Hanlon, R. T., & Jozet-Alves, C. (2021) · Proceedings of the Royal Society B: Biological Sciences · doi:10.1098/rspb.2021.1052 · Cited by 36 · see citing works
Self-citationDavies, J. R., Garcia-Pelegrin, E., & Clayton, N. S. (2024) · PLOS ONE · doi:10.1371/journal.pone.0301298 · Cited by 31 · see citing works
Self-citationEpisodic-like memory in common bottlenose dolphins
Davies, J. R., Garcia-Pelegrin, E., Baciadonna, L., Pilenga, C., Favaro, L., & Clayton, N. S. (2022) · Current Biology · doi:10.1016/j.cub.2022.06.032 · Cited by 29 · see citing works
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Davies, J. R., & Clayton, N. S. (2024) · Philosophical Transactions of the Royal Society B: Biological Sciences · doi:10.1098/rstb.2023.0397 · Cited by 27 · see citing works
Self-citationWilkins, C., & Clayton, N. (2019) · Neuropsychologia · doi:10.1016/j.neuropsychologia.2019.107221 · Cited by 12 · see citing works
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DeChant, C. (2025) · 2025 IEEE Conference on Secure and Trustworthy Machine Learning (SaTML) · doi:10.1109/satml64287.2025.00024 · Cited by 5 · see citing works
“Rather than focusing on phenomenological aspects of memory, it is possible instead to consider episodic memory as simply combining memory for what happened, when it happened, and where it happened [91].”
- Authors
- Griffiths, D., Dickinson, A., & Clayton, N.
- Affiliations
- University of California, Davis (US)
- University of Cambridge (GB)
- Corresponding author
- Griffiths, Daniel
- Dickinson, Anthony
- Clayton, Nicola
- Venue
- Trends in Cognitive Sciences
- Publisher
- Elsevier BV
- Published
- 1999-02
- Volume
- 3
- Issue
- 2
- Pages
- 74-80
- ISSN
- 1364-6613 (ISSN-L)
- OpenAlex
- W2065450906
- Cited by
- 228
- References
- 43
- Citations by year
- 2026: 2 · 2025: 4 · 2024: 11 · 2023: 3 · 2022: 7 · 2021: 7 · 2020: 7 · 2019: 3 · 2018: 5 · 2017: 8 · 2016: 2 · 2015: 32 · 2014: 9 · 2013: 6 · 2012: 11
- FWCI
- 1.03
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Trends in Cognitive Sciences (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Life Sciences › Neuroscience › Cognitive Neuroscience › Memory Processes and Influences
- Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
- Social Sciences › Psychology › Developmental and Educational Psychology › Child and Animal Learning Development
- Keywords
- episodic memory, episodic-like memory, avian cognition, declarative memory, hippocampal function, animal cognition, comparative cognition
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