The effects of aging on memory for sequentially presented objects in rats.
Open accessAbstract
The current study investigated memory for sequentially presented objects in young rats 6 months old (n = 12) and aged rats 24 months old (n = 12). Rats were tested on a task involving three exploratory trials and one probe test. During the exploratory trials, the rat explored a set of three sequentially presented object pairs (A-A, B-B, and C-C) for 5 min per pair with a 3-min delay between each pair. Following the exploratory trials, a probe test was conducted where the rat was presented simultaneously with one object from the first exploratory trial (A) and one object from the third exploratory trial (C). Results from the exploratory trials showed no significant age-related differences in exploration, indicating that 24-month-old rats explored the object pairs as much as 6-month-old rats. The probe test demonstrated that 6-month-old rats spent significantly more time exploring object A compared to object C, indicating that young rats show intact temporal order memory for the exploratory trial objects. However, 24-month-old rats showed no preference for object A and spent a relatively equal amount of time exploring objects A and C. The results suggest that temporal order memory declines as a result of age-related changes in the rodent brain. The findings also may reflect differences in attraction to objects with different memory strengths. Since age-related differences were not detected during the exploratory trials, age-related differences on the probe trial were not due solely to decreased exploration, motivation, or locomotion.
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Research on memory in rodents and monkeys suggests that both spatial (what-where) and temporal (what-when) elements of memory decline alongside typical age-related changes within the brain.
“research on memory in rodents and monkeys, although again not strictly in line with episodic-like memory criteria, suggests that both spatial (what–where) [139–142] and temporal (what–when) [142,143] elements of memory decline alongside typical age-related changes within the brain.”
From Is episodic-like memory <i>like</i> episodic memory? (2024) · cites this paper as [143]
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Episodic-like memory is preserved with age in cuttlefish
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Is episodic-like memory <i>like</i> episodic memory?
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- Authors
- Hauser, E., Tolentino, J. C., Pirogovsky, E., Weston, E., & Gilbert, P. E.
- Affiliations
- San Diego State University (US)
- Venue
- Behavioral Neuroscience
- Published
- 2009
- Volume
- 123
- Issue
- 6
- Pages
- 1339-1345
- ISSN
- 0735-7044 (ISSN-L)
- 1939-0084
- PMC
- PMC2819214
- OpenAlex
- W2089999374
- Cited by
- 17
- References
- 90
- Citations by year
- 2024: 1 · 2022: 1 · 2021: 2 · 2019: 1 · 2018: 1 · 2017: 1 · 2016: 1 · 2015: 1 · 2013: 1 · 2012: 3
- FWCI
- 1.13
- Type
- journal article
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Locations
- Behavioral Neuroscience (publishedVersion)
- PubMed (publishedVersion)
- PubMed Central (acceptedVersion)
- Funders
- National Institute on Aging (AG026505)
- Topics
- Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
- Life Sciences › Neuroscience › Cognitive Neuroscience › Memory Processes and Influences
- Social Sciences › Psychology › Experimental and Cognitive Psychology › Cognitive Functions and Memory
- Keywords
- aging, temporal order memory, object recognition memory, age-related memory decline, rats, object exploration, probe test, memory strength
- MeSH terms
- Age Factors, Aging, Analysis of Variance, Animals, Attention, Behavior, Animal, Exploratory Behavior, Male, Rats, Inbred F344, Space Perception, Time Factors, Recognition, Psychology, Rats
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