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Reconsolidation: Behavioural and Electrophysiological Sequelae of Context and Stress in Human Episodic Memory

von Dr. Jennifer L. Moore

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[1.] Jm/Fragment 287 01 - Diskussion
Zuletzt bearbeitet: 2014-01-13 07:35:31 Graf Isolan
Debiec et al 2002, Fragment, Gesichtet, Jm, SMWFragment, Schutzlevel sysop, Verschleierung

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Untersuchte Arbeit:
Seite: 287, Zeilen: 1-7
Quelle: Debiec et al 2002
Seite(n): 527, Zeilen: 36ff
[For example, using a radial arm maze with rats, systemic postreactivation injections of propranol were] effective at producing amnesia if the memory was first reactivated (Przybyslawski et al., 1999). Similarly, disruption of CREB-mediated transcription in the forebrain interferes with the reconsolidation of contextual fear memories (Kida et al., 2002). In support of the possibility that memories stored within the hippocampus itself might undergo reconsolidation are the findings showing that reactivation of contextual memories induces the expression of zif268, a gene implicated in the consolidation of new hippocampal-dependent memories (Hall et al., 2001). For example, using a radial arm maze, systemic postreactivation injections of propranol were effective at producing amnesia if the memory was first reactivated (Przybyslawski et al., 1999). [...] Similarly, recent findings that disruption of CREB-mediated transcription in the forebrain interferes with the reconsolidation of contextual fear memories (Kida et al., 2002) suffer from the same drawback. In support of the possibility that memories stored within the hippocampus itself might undergo reconsolidation are the recent findings showing that reactivation of contextual memories induces the expression of zif268, a gene implicated in consolidation of new hippocampal-dependent memories (Hall et al., 2001).
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Sichter
(Hindemith) Agrippina1

[2.] Jm/Fragment 287 13 - Diskussion
Zuletzt bearbeitet: 2014-01-12 16:23:27 Graf Isolan
Fragment, Gesichtet, Jm, SMWFragment, Schutzlevel sysop, Tollenaar et al 2009, Verschleierung

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Seite: 287, Zeilen: 13-21
Quelle: Tollenaar et al 2009
Seite(n): 51, Zeilen: 32ff
In animal studies, post-retrieval administration of propranolol has been found to disrupt spatial memory and inhibitory avoidance learning in rodents (Przybyslawski et al., 1999), as well as auditory fear conditioning (Debiec & Ledoux, 2004), with both findings explained in terms of impaired reconsolidation processes. Tronel and Alberini (2007) demonstrated that reconsolidation might also be dependent upon the glucocorticoid system, as they found that a glucocorticoid receptor antagonist disrupted conditioned fear in rats after reactivation of an inhibitory avoidance memory. In a similar vein, Maroun and Akirav (2007) found an impairing effect of stress on reconsolidation in rats, which was reversed by a glucocorticoid receptor antagonist. Post-retrieval administration of propranolol has been found to disrupt spatial memory and inhibitory avoidance learning in rodents (Przybyslawski et al., 1999), as well as auditory fear conditioning (Debiec & Ledoux, 2004), and both findings have been explained in terms of impaired reconsolidation processes. Tronel and Alberini (2007) have recently shown that reconsolidation might also be dependent on the glucocorticoid system, as they found that a glucocorticoid receptor antagonist can disrupt conditioned fear in rats after reactivation of an inhibitory avoidance memory. In line with that, Maroun and Akirav (2007) have found an impairing effect of stress on reconsolidation in rats, which was reversed by a glucocorticoid receptor antagonist.
Anmerkungen

The source is not given.

Sichter
(Hindemith) Agrippina1

[3.] Jm/Fragment 287 22 - Diskussion
Zuletzt bearbeitet: 2014-01-12 21:49:08 Graf Isolan
Fragment, Gesichtet, Jm, SMWFragment, Schutzlevel sysop, Verschleierung, Wang et al 2008

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Untersuchte Arbeit:
Seite: 287, Zeilen: 22-25
Quelle: Wang et al 2008
Seite(n): 5607, 5608, Zeilen: 5607: r.col: 16ff; 5608: l.col: 1f
Cai and colleagues (2006) reported that when glucocorticoids were administered immediately after reactivation of a contextual fear memory, subsequent recall was significantly diminished. However, the effect of postreactivation glucocorticoid on contextual fear memory was reversed by a reminder shock, thereby suggesting that augmentation of single- [page 288] trial contextual fear memory extinction is the more likely mechanism for these effects of postreactivation corticosterone on subsequent memory (Cai et al., 2006). Cai et al. (2006) reported that when glucocorticoids are administered immediately after reactivation of a contextual fear memory, subsequent recall is significantly diminished. However, the effect of postreactivation glucocorticoid on contextual fear memory is reversed by a reminder shock. This finding suggests that augmentation of single-trial contextual fear memory extinc-

[page 5608]

tion is the more likely mechanism for the effects of postreactivation corticosterone on subsequent memory (Cai et al., 2006).

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Continued on the next page: Jm/Fragment_288_01

Sichter
(Hindemith) Agrippina1


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