Skip to main content

LUP Student Papers

LUND UNIVERSITY LIBRARIES

Det ligger i detaljerna! - Hur varierad inkodning leder till bristande episodiskt minne

Allard Dohm-Hansen, Sebastian LU (2014) PSYK11 20141
Department of Psychology
Abstract
The role of the Hippocampus in episodic memory has been fervently discussed for a long time. A new model, titled ”Competitive Trace Theory”, holds
that the role of this temporal lobe structure is to “contextualize” memory. This is achieved by the establishing of new, multi-modal memory traces every time the memory is reactivated. These distinct memory patterns all share a mutual component of the memory, yet in addition they contain unique patterns of activity, which compete with each other in order to be consolidated. The neocortex however, slowly changes in response to frequently occurring invariant information, and is also the final site of consolidation. Observing this, I tested the hypothesis that: the ability to correctly reject a... (More)
The role of the Hippocampus in episodic memory has been fervently discussed for a long time. A new model, titled ”Competitive Trace Theory”, holds
that the role of this temporal lobe structure is to “contextualize” memory. This is achieved by the establishing of new, multi-modal memory traces every time the memory is reactivated. These distinct memory patterns all share a mutual component of the memory, yet in addition they contain unique patterns of activity, which compete with each other in order to be consolidated. The neocortex however, slowly changes in response to frequently occurring invariant information, and is also the final site of consolidation. Observing this, I tested the hypothesis that: the ability to correctly reject a similar (rotated) lure during test should be worse if the targets during encoding were variant (gradually rotated) rather than invariant (targets repeated unaltered). This was tested using a modified version of the Behavioural Pattern Separation – Object Task. Subjects (N = 33) engaged in the encoding of 200 objects for three trials and were subsequently tested on 50 identical, 50 new, and 100 similar objects. The task was to correctly identify these as “old”, “new” and “similar” respectively. The results confirm the hypothesis as the probability of falsely responding “old” to a lure was higher given variant encoding. The findings are discussed in relation to the aforementioned theory, and current neurobiological models of memory. The paper determines the cause of these results to remain inconclusive, until neurophysiological findings corroborate them. (Less)
Abstract (Swedish)
Vilken roll Hippocampus har i det episodiska minnessystemet är hett
omdebatterat. En nylanserad teori, Competitive Trace Theory, stipulerar att strukturen ”kontextualiserar” minnen genom att skapa nya, multimodala minnesspår vid varje reaktivering av dem. Alla olika minnesspår har en gemensam, överlappande komponent samt en unik icke-överlappande komponent, och spåren konkurrerar om att slutligen konsolideras i neocortex. Neocortex förändras däremot långsamt som svar på högfrekvent och konsekvent information. Med detta i beaktning testade jag därför hypotesen att: sannolikheten att korrekt kunna differentiera ett snarlikt (roterat) testobjekt från tidigare objekt under inkodning, är lägre om de var varierande (gradvis roterade över... (More)
Vilken roll Hippocampus har i det episodiska minnessystemet är hett
omdebatterat. En nylanserad teori, Competitive Trace Theory, stipulerar att strukturen ”kontextualiserar” minnen genom att skapa nya, multimodala minnesspår vid varje reaktivering av dem. Alla olika minnesspår har en gemensam, överlappande komponent samt en unik icke-överlappande komponent, och spåren konkurrerar om att slutligen konsolideras i neocortex. Neocortex förändras däremot långsamt som svar på högfrekvent och konsekvent information. Med detta i beaktning testade jag därför hypotesen att: sannolikheten att korrekt kunna differentiera ett snarlikt (roterat) testobjekt från tidigare objekt under inkodning, är lägre om de var varierande (gradvis roterade över inkodningsfasen) än om de förblev konstanta (identiskt repeterade över inkodningsfasen). Detta testades med en modifierad version av Behavioural Pattern Separation – Object Task. Uppgiften gick ut på att låta deltagare (N = 33) koda in 200 unika objekt i tre omgångar. Därefter testades deltagarna på 50 identiska, 50 nya, och 100 snarlika objekt. Dessa skulle korrekt bedömas som ”gamla”, ”nya”, och ”snarlika” respektive. Resultaten bekräftade hypotesen då sannolikheten för att falskt svara ”gammal” på ett snarlikt testobjekt var högre givet varierande inkodning. Resultaten diskuteras utifrån det teoretiska ramverket ovan samt neurobiologiska modeller. Rapporten konstaterar att resultaten som bäst kan förklaras teoretiskt, och att dessa inte är konklusiva förrän de korroborerats med neurofysiologiska data. (Less)
Please use this url to cite or link to this publication:
author
Allard Dohm-Hansen, Sebastian LU
supervisor
organization
course
PSYK11 20141
year
type
M2 - Bachelor Degree
subject
keywords
Competitive trace theory, episodic memory, pattern separation, recognition memory
language
Swedish
id
4464385
date added to LUP
2014-06-13 16:34:18
date last changed
2014-06-13 16:34:18
@misc{4464385,
  abstract     = {{The role of the Hippocampus in episodic memory has been fervently discussed for a long time. A new model, titled ”Competitive Trace Theory”, holds
that the role of this temporal lobe structure is to “contextualize” memory. This is achieved by the establishing of new, multi-modal memory traces every time the memory is reactivated. These distinct memory patterns all share a mutual component of the memory, yet in addition they contain unique patterns of activity, which compete with each other in order to be consolidated. The neocortex however, slowly changes in response to frequently occurring invariant information, and is also the final site of consolidation. Observing this, I tested the hypothesis that: the ability to correctly reject a similar (rotated) lure during test should be worse if the targets during encoding were variant (gradually rotated) rather than invariant (targets repeated unaltered). This was tested using a modified version of the Behavioural Pattern Separation – Object Task. Subjects (N = 33) engaged in the encoding of 200 objects for three trials and were subsequently tested on 50 identical, 50 new, and 100 similar objects. The task was to correctly identify these as “old”, “new” and “similar” respectively. The results confirm the hypothesis as the probability of falsely responding “old” to a lure was higher given variant encoding. The findings are discussed in relation to the aforementioned theory, and current neurobiological models of memory. The paper determines the cause of these results to remain inconclusive, until neurophysiological findings corroborate them.}},
  author       = {{Allard Dohm-Hansen, Sebastian}},
  language     = {{swe}},
  note         = {{Student Paper}},
  title        = {{Det ligger i detaljerna! - Hur varierad inkodning leder till bristande episodiskt minne}},
  year         = {{2014}},
}