Temporal Dynamics of Memory Integration Processes

Zhenghao Liu

Temporal Dynamics of Memory Integration Processes

Zhenghao Liu

Institutionen för psykologi

Forskningsoutput: Avhandling › Doktorsavhandling (sammanläggning)

59 Nedladdningar (Pure)

Sammanfattning

Episodiska minnen kan sträcka sig bortom direkta upplevelser. Till exempel, om du ser en kvinna promenera med en hund och senare observerar en man med samma hund, kan du dra slutsatsen att det finns en koppling mellan dem. Sådana inferenser är centrala för att möjliggöra flexibelt beslutsfattande och generalisering av tidigare kunskap till nya situationer, och anses bero på mekanismer för minnesintegration.
Två huvudsakliga mekanismer har föreslagits för hur minnesintegration sker. Enligt teorin om integrativ inkodning kan nya erfarenheter utlösa reaktivering av tidigare relaterade händelser, vilket främjar införlivandet av ny information i befintliga kunskapsstrukturer och därmed bildandet av integrerade minnesrepresentationer. En alternativ teori föreslår att integration kan ske vid behov, genom flexibel återhämtning och rekombination av information från separata minnesspår.
Denna avhandling använder tidsupplöst multivariat mönsteranalys samt representationslikhetsanalys för att mäta minnesreaktivering under ny inlärning och vid tester av associativ inferens. Denna ansats möjliggör undersökning av den temporala dynamiken i processer som ligger till grund för minnesintegration och deras gränsvillkor. Denna ansats möjliggör en undersökning av de temporala dynamiker som präglar minnesintegration, liksom identifiering av dess gränsvillkor. Studie 1 undersöker den temporala dynamiken i integrativ inkodning och belyser individuella skillnader i förmågan att integrera minnen över olika händelser. Studie 2 analyserar hur inkodningskontexten påverkar integrationsprocesserna, medan Studie 3 fokuserar på de distinkta roller som kontext respektive semantiska scheman spelar i dessa. Slutligen utforskar Studie 4 hur både integrerade och separata minnesrepresentationer bidrar till episodiskt minne.
Avhandlingen presenterar ny empirisk evidens för de mekanismer som ligger till grund för minnesintegration, samt klargör möjliga gränsvillkor för integration av minnen över skilda händelser. Sammanfattningsvis framstår minnesintegration som ett mångfacetterat fenomen, påverkat av processer i flera minnesstadier och av olika gränsvillkor. De resulterande integrerade och separata representationerna används adaptivt för att stödja målorienterat beteende, vilket understryker minnesfunktionernas flexibilitet och komplexitet.

Originalspråk	engelska
Kvalifikation	Doktor
Tilldelande institution	Institutionen för psykologi
Handledare	Bramao, Ines, handledare Johansson, Mikael, handledare
Tilldelningsdatum	2025 juni 3
Utgivningsort	Lund
Förlag	Lund University
ISBN (tryckt)	978-91-8104-541-3
ISBN (elektroniskt)	978-91-8104-542-0
Status	Published - 2025 maj

Bibliografisk information

Defence details
Date: 2025-06-03
Time: 13:15
Place: Eden’s hörsal, Allhelgona kyrkogata 14, Lund
External reviewer(s)
Name: Staresina, Bernhard
Title: Professor
Affiliation: Oxford University
---

Ämnesklassifikation (UKÄ)

Psykologi (exklusive tillämpad psykologi)

FN:s Globala mål

Denna forskningsoutput relaterar till följande Globala mål

Tillgång till dokument

thesis_summaryPublicerad version, 1,71 MB

2 Poster
2 Artikel i vetenskaplig tidskrift
1 Preprint (i preprint-arkiv)

Remembering the past affects new learning: The temporal dynamics of integrative encoding
Bramão, I., Liu, Z. & Johansson, M., 2025 juni 6, I: Neuropsychologia. 212, 109148.
Forskningsoutput: Tidskriftsbidrag › Artikel i vetenskaplig tidskrift › Peer review

Öppen tillgång
Episodic events are flexibility encoded in both integrated and separated neural representations
Liu, Z., Johansson, M. & Bramao, I., 2025 maj 5, bioRxiv.
Forskningsoutput: Working paper/Preprint › Preprint (i preprint-arkiv)

Öppen tillgång
The effects of episodic context on memory integration
Liu, Z., Johansson, M., Johansson, R. & Bramão, I., 2024 dec. 4, I: Scientific Reports. 14, 1, 30159.
Forskningsoutput: Tidskriftsbidrag › Artikel i vetenskaplig tidskrift › Peer review

Öppen tillgång

Citera det här

@phdthesis{fbfb33aa5dc74e43951b9d29018198ea,

title = "Temporal Dynamics of Memory Integration Processes",

abstract = "Episodic memories can extend beyond direct experiences. For example, if you see a woman walking a dog and later observe a man walking the same dog, you might infer a connection between them. These inferences, crucial for making novel decisions and extending knowledge to new situations, are thought to rely on memory integration mechanisms.Two main mechanisms have been proposed for memory integration. The integrative encoding account suggests that novel experiences can trigger the reactivation of past events, promoting the incorporation of new information into existing knowledge structures to form integrated memory representations. A complementary view proposes that memory integration can be achieved on demand, by flexibly retrieving and recombining information from distinct memory representations.The present thesis employs time-resolved multivariate pattern analysis and representational similarity analysis to measure memory reactivation during new learning and tests of associative inference. This approach enables the investigation of the temporal dynamics of processes underlying memory integration and their boundary conditions. Study 1 investigates the temporal dynamics of integrative encoding and highlights individual differences in the capacity to integrate memories across events. Study 2 examines how the encoding context influences memory integration processes, while Study 3 focuses on the distinct roles of context and semantic schema in memory integration. Finally, Study 4 investigates how both integrated and separate memory representations support episodic memory.This thesis presents novel evidence on the mechanisms underlying memory integration and elucidates potential boundary conditions for integrating memories across different events. In conclusion, memory integration is a multifaceted phenomenon influenced by processes at multiple mnemonic stages and by various boundary conditions. The resulting integrated and separate representations are adaptively used to support goal-relevant behaviour, highlighting the flexibility and complexity of memory functions.",

keywords = "memory integration, EEG, MVPA, RSA, context, schema",

author = "Zhenghao Liu",

note = "Defence details Date: 2025-06-03 Time: 13:15 Place: Eden{\textquoteright}s auditorium, Allhelgona kyrkogata 14, Lund External reviewer(s) Name: Staresina, Bernhard Title: Professor Affiliation: Oxford University --- ",

year = "2025",

month = may,

language = "English",

isbn = "978-91-8104-541-3",

publisher = "Lund University",

type = "Doctoral Thesis (compilation)",

school = "Department of Psychology",

}

TY - THES

T1 - Temporal Dynamics of Memory Integration Processes

AU - Liu, Zhenghao

N1 - Defence details Date: 2025-06-03 Time: 13:15 Place: Eden’s auditorium, Allhelgona kyrkogata 14, Lund External reviewer(s) Name: Staresina, Bernhard Title: Professor Affiliation: Oxford University ---

PY - 2025/5

Y1 - 2025/5

N2 - Episodic memories can extend beyond direct experiences. For example, if you see a woman walking a dog and later observe a man walking the same dog, you might infer a connection between them. These inferences, crucial for making novel decisions and extending knowledge to new situations, are thought to rely on memory integration mechanisms.Two main mechanisms have been proposed for memory integration. The integrative encoding account suggests that novel experiences can trigger the reactivation of past events, promoting the incorporation of new information into existing knowledge structures to form integrated memory representations. A complementary view proposes that memory integration can be achieved on demand, by flexibly retrieving and recombining information from distinct memory representations.The present thesis employs time-resolved multivariate pattern analysis and representational similarity analysis to measure memory reactivation during new learning and tests of associative inference. This approach enables the investigation of the temporal dynamics of processes underlying memory integration and their boundary conditions. Study 1 investigates the temporal dynamics of integrative encoding and highlights individual differences in the capacity to integrate memories across events. Study 2 examines how the encoding context influences memory integration processes, while Study 3 focuses on the distinct roles of context and semantic schema in memory integration. Finally, Study 4 investigates how both integrated and separate memory representations support episodic memory.This thesis presents novel evidence on the mechanisms underlying memory integration and elucidates potential boundary conditions for integrating memories across different events. In conclusion, memory integration is a multifaceted phenomenon influenced by processes at multiple mnemonic stages and by various boundary conditions. The resulting integrated and separate representations are adaptively used to support goal-relevant behaviour, highlighting the flexibility and complexity of memory functions.

AB - Episodic memories can extend beyond direct experiences. For example, if you see a woman walking a dog and later observe a man walking the same dog, you might infer a connection between them. These inferences, crucial for making novel decisions and extending knowledge to new situations, are thought to rely on memory integration mechanisms.Two main mechanisms have been proposed for memory integration. The integrative encoding account suggests that novel experiences can trigger the reactivation of past events, promoting the incorporation of new information into existing knowledge structures to form integrated memory representations. A complementary view proposes that memory integration can be achieved on demand, by flexibly retrieving and recombining information from distinct memory representations.The present thesis employs time-resolved multivariate pattern analysis and representational similarity analysis to measure memory reactivation during new learning and tests of associative inference. This approach enables the investigation of the temporal dynamics of processes underlying memory integration and their boundary conditions. Study 1 investigates the temporal dynamics of integrative encoding and highlights individual differences in the capacity to integrate memories across events. Study 2 examines how the encoding context influences memory integration processes, while Study 3 focuses on the distinct roles of context and semantic schema in memory integration. Finally, Study 4 investigates how both integrated and separate memory representations support episodic memory.This thesis presents novel evidence on the mechanisms underlying memory integration and elucidates potential boundary conditions for integrating memories across different events. In conclusion, memory integration is a multifaceted phenomenon influenced by processes at multiple mnemonic stages and by various boundary conditions. The resulting integrated and separate representations are adaptively used to support goal-relevant behaviour, highlighting the flexibility and complexity of memory functions.

KW - memory integration

KW - EEG

KW - MVPA

KW - RSA

KW - context

KW - schema

M3 - Doctoral Thesis (compilation)

SN - 978-91-8104-541-3

PB - Lund University

CY - Lund

ER -

Temporal Dynamics of Memory Integration Processes

Sammanfattning

Bibliografisk information

Ämnesklassifikation (UKÄ)

FN:s Globala mål

Tillgång till dokument

Fingeravtryck

Forskningsoutput

Remembering the past affects new learning: The temporal dynamics of integrative encoding

Episodic events are flexibility encoded in both integrated and separated neural representations

The effects of episodic context on memory integration

Citera det här