On the delay-dependent involvement of the hippocampus in object recognition memory
Abstract
The role of the hippocampus in object recognition memory processes is unclear in the current literature. Conflicting results have been found in lesion studies of both primates and rodents. Procedural differences between studies, such as retention interval, may explain these discrepancies. In the present study, acute lidocaine administration was used to temporarily inactivate the hippocampus prior to training in the spontaneous object recognition task. Male C57BL/6J mice were administered bilateral lidocaine (4%, 0.5 microl/side) or aCSF (0.5 microl/side) directly into the CA1 region of the dorsal hippocampus 5 min prior to sample object training, and object recognition memory was tested after a short ( 5 min) or long (24 h) retention interval. There was no effect of intra-hippocampal lidocaine on the time needed for mice to accumulate sample object exploration, suggesting that inactivation of the hippocampus did not affect sample session activity or the motivation to explore objects. Lidocaine-treated mice exhibited impaired object recognition memory, measured as reduced novel object preference, after a 24 h but not a 5 min retention interval. These data support a delay-dependent role for the hippocampus in object recognition memory, an effect consistent with the results of hippocampal lesion studies conducted in rats. However, these data are also consistent with the view that the hippocampus is involved in object recognition memory regardless of retention interval, and that object recognition processes of parahippocampal structures (e.g., perirhinal cortex) are sufficient to support object recognition memory over short retention intervals.
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Pre-sample intra-hippocampus infusions of lidocaine or muscimol disrupted NOP memory tested 24 hours later in mice.
“Alternatively, pre-sample intra-hippocampus infusions of lidocaine (Hammond et al., 2004) or muscimol (Cohen et al., 2013) was reported to disrupt NOP memory tested 24 hours later in mice.”
From The medial prefrontal cortex - hippocampus circuit that integrates information of object, place and time to construct episodic memory in rodents: Behavioral, anatomical and neurochemical properties (2020) · cites this paper as Hammond et al., 2004
For the 24 h intertrial interval from familiarization to test phase used in this study, hippocampal activity is required.
“However, some human and primate studies have shown that hippocampal lesions result in impaired object recognition (41, 42) and that, for the 24 h intertrial interval from familiarization to test phase used in our study, hippocampal activity is required (43).”
From Synthetic amyloid-β oligomers impair long-term memory independently of cellular prion protein (2010) · cites this paper as [43]
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- Authors
- HAMMOND, R.
- Affiliations
- Oregon Health & Science University (US)
- Corresponding author
- HAMMOND, R
- Venue
- Neurobiology of Learning and Memory
- Publisher
- Elsevier BV
- Published
- 2004-07
- Volume
- 82
- Issue
- 1
- Pages
- 26-34
- ISSN
- 1074-7427 (ISSN-L)
- OpenAlex
- W2012482368
- Cited by
- 476
- References
- 57
- Citations by year
- 2026: 11 · 2025: 19 · 2024: 25 · 2023: 20 · 2022: 25 · 2021: 30 · 2020: 30 · 2019: 26 · 2018: 29 · 2017: 20 · 2016: 32 · 2015: 25 · 2014: 20 · 2013: 30 · 2012: 20
- FWCI
- 6.71
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Neurobiology of Learning and Memory (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Institute on Drug Abuse (T32DA007262, 5T32 DA07262)
- Topics
- Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
- Life Sciences › Neuroscience › Cognitive Neuroscience › Memory Processes and Influences
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
- Keywords
- hippocampus, object recognition memory, retention interval, lidocaine inactivation, CA1, novel object preference, perirhinal cortex, mice
- MeSH terms
- Anesthetics, Local, Animals, Exploratory Behavior, Form Perception, Hippocampus, Lidocaine, Male, Mice, Inbred C57BL, Microinjections, Reaction Time, Time Factors, Recognition, Psychology, Mice
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