Literaturnachweis - Detailanzeige
| Autor/inn/en | Rudy, Jerry W.; Wright-Hardesty, Karli |
|---|---|
| Titel | The Temporal Dynamics of Retention of a Context Memory: Something Is Missing |
| Quelle | In: Learning & Memory, 12 (2005) 2, S.172-177 (6 Seiten)
PDF als Volltext |
| Sprache | englisch |
| Dokumenttyp | gedruckt; online; Zeitschriftenaufsatz |
| ISSN | 1072-0502 |
| DOI | 10.1101/lm.84005 |
| Schlagwörter | Fear; Animals; Context Effect; Memory; Conditioning; Stimuli; Inhibition; Motor Reactions; Retention (Psychology); Hypothesis Testing; Short Term Memory; Ethology; Scientific Methodology; Neuropsychology |
| Abstract | We use a variation of contextual fear conditioning, called the context pre-exposure facilitation effect (CPFE) to study the rat's memory for context. In this paradigm, the rat is pre-exposed to a conditioning context and later returned to that context, where it is immediately shocked. The memory context is revealed by the fact that pre-exposure to the conditioning context, but not to a different context, greatly enhances conditioned fear produced by immediate shock. We report that rat's retention of the context memory is a nonmonotonic U-shaped function of the interval separating pre-exposure and immediate shock. Retention performance decays rapidly so that within 2 min of pre-exposure there is no evidence that the rat was pre-exposed to the context. Within a few hours, however, a strong CPFE was observed that persisted for at least 28 d. Two hypotheses are discussed: (1) the descending arm of the U represents a retrieval failure, and (2) the U-shaped function represents two discontinuous memory processes initiated in parallel--short-term synaptic changes that are rapidly initiated, but also decay rapidly, and long-term synaptic processes that take time to generate but can endure for days. (Contains 5 figures.) (Author). |
| Anmerkungen | Cold Spring Harbor Laboratory Press. 500 Sunnyside Boulevard, Woodbury, NY 11797-2924. Tel: 800-843-4388; 516-367-8800; Fax: 516-422-4097; e-mail: cshpres@cshl.edu; Web site: http://www.learnmem.org/ |
| Erfasst von | ERIC (Education Resources Information Center), Washington, DC |
| Update | 2017/4/10 |
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