Intracerebral distribution of DL-2-amino-phosphonopentanoic acid (AP5) and the dissociation of different types of learning
Abstract
Chronic intraventricular infusion of the selective NMDA receptor antagonist AP5 appears to cause an impairment of spatial but not visual discrimination learning. However, Goddard (1986) has questioned whether this dissociation in task-selectivity reflects a difference in the underlying neural mechanisms or differential drug diffusion. Two experiments conducted to address this issue established (a) that chronic intraventricular infusion of AP5, at a dose sufficient to cause a spatial learning impairment, results in a relatively uniform distribution of the drug across the brain, and (b) that chronic bilateral intracortical infusion at sites very close to visual cortex also fails to impair visual discrimination learning. These findings argue against differential diffusion being a major cause of the sensitivity of spatial but not visual discrimination tasks to AP5, and raises the possibility that representational and procedural memory tasks may depend upon distinct cell-biological mechanisms of plasticity.
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The target of AP5 infusion is not restricted to the hippocampus.
“Likewise, in pharmacological studies the target of the AP5 infusion is not restricted to the hippocampus (Butcher et al., 1991).”
From The essential role of hippocampal CA1 NMDA receptor-dependent synaptic plasticity in spatial memory. (1996) · cites this paper as Butcher et al., 1991
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- Authors
- Butcher, S. P., Hamberger, A., & Morris, R. G. M.
- Affiliations
- University of Edinburgh (GB)
- University of Gothenburg (SE)
- Venue
- Experimental Brain Research
- Published
- 1991-02
- Volume
- 83
- Issue
- 3
- Pages
- 521-6
- ISSN
- 0014-4819 (ISSN-L)
- 1432-1106
- OpenAlex
- W2002447155
- Cited by
- 40
- References
- 22
- Citations by year
- 2024: 1 · 2020: 2 · 2013: 3 · 2012: 1
- FWCI
- 2.08
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- www.springer.com/tdm (tdm)
- Locations
- Experimental Brain Research (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
- Keywords
- AP5, NMDA receptor antagonism, intraventricular infusion, spatial discrimination learning, visual discrimination learning, learning disabilities, procedural memory, synaptic plasticity
- MeSH terms
- Animals, Brain, Cerebral Cortex, Cerebral Ventricles, Corpus Striatum, Discrimination, Psychological, Hippocampus, Infusions, Parenteral, Learning, Male, Neurons, Organ Specificity, Rats, Inbred Strains, Reference Values, Space Perception, Visual Cortex, Visual Perception, 2-Amino-5-phosphonovalerate, Rats
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