Mental time travel in animals: A challenging question
Section snippets
Looking backward—episodic memory in animals
A more embedded cognitive process is the ability to mentally travel backward in time. The ability of humans to visualize a past event that was personally experienced, referred to as episodic memory, is meaningful because each of us has subjectively reexperienced past events. The distinction between the reexperience of personally experienced events (episodic memory) and the retrieval of factual information or rules (semantic memory) was proposed by Tulving (1972). The presumption is that
Looking forward—planning for the future
Although we may be unable to determine whether animals have episodic memory, which was our original concern, we may be able to ask whether animals can plan for the future. In a simplistic sense, the answer is certainly yes. Birds build nests into which they will lay eggs, and bears hibernate in the winter to reduce their caloric loss during times when food is relatively scarce. However, from a cognitive perspective, such planning occurs under close genetic control and would not be considered to
Conclusions
Evidence from research on episodic memory in animals suggests that when unexpectedly asked to do so, pigeons are able to retrieve their own behavior (whether they had just pecked or not) or the occurrence of an important event (whether or not they had just been fed). Such data are more in keeping with the implied questions asked in human episodic memory experiments than with the ‘what, where, and when’ questions presumed to provide evidence for episodic memory.
If the function of mentally
Acknowledgements
Preparation of this manuscript and some of the research reported here was supported by National Institute of Mental Health Grant MH-59194. I thank Marcia Spetch and two anonymous reviewers for their helpful comments on an earlier version of the manuscript.
References (62)
- et al.
Prometheus to Proust: the case for behavioural criteria for ‘mental time travel’
Trends Cogn. Sci.
(2003) - et al.
Short-term memory and information processing in pigeons
Learn. Motiv.
(1977) - et al.
Comprehension of sentences by bottlenosed dolphins
Cognition
(1984) - et al.
Choice in a self-control paradigm with human subjects: effects of changeover delay duration
Learn. Motiv.
(1987) - et al.
A new technique for investigating the feeling of knowing
Acta Psychol.
(1980) - et al.
Self-recognition in chimpanzees and orangutans, but not gorillas
J. Hum. Evol.
(1981) - et al.
Mental time-travel in animals?
Trends Cogn. Sci.
(2003) Are expectancies based on different positive reinforcing events discriminably different?
Learn. Motiv.
(1970)- et al.
Instrumental responding following reinforcer devaluation
Q. J. Exp. Psychol.
(1981) On the phylogeny of human morality