The Neural Correlates of Repeated Memory Encoding and Content Reinstatement

Sievers, Carolin (2018) The Neural Correlates of Repeated Memory Encoding and Content Reinstatement. Doctoral thesis, University of East Anglia.

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The present thesis reports findings from experiments investigating the neural correlates of subsequent source memory performance, repetition and reinstatement of item and source information. Electrophysiological and haemodynamic response data were obtained in two experimental paradigms further investigating effects of encoding modality and encoding context. The primary aim was to identify how neural pattern similarity was influenced by changes to perceptual stimulus features or changes to encoding task instructions, with a particular focus on the role of pattern reactivation. The first set of experiments (Chapters 3 & 4) examined the effects of encoding modality on source memory processes and repetition during study and test phases. Representational similarity analysis of the fMRI data revealed modality independent and modality-dependent source memory effects, suggesting that reactivation of different stimulus features predicted source memory performance when stimuli are repeatedly presented. Overall, the results provide evidence for pattern reactivation to benefit source memory formation and retrieval. The second set of experiments (Chapters 5 & 6) investigated the effects of encoding items repeatedly in the same context or across multiple contexts. Pattern reactivation in the same task condition was shown to enhance source memory for the encoding context. However, lower levels of reactivation were associated with successful source memory performance when stimuli were associated with multiple contexts. Together with the EEG data, the results provide evidence for distinct mechanisms to underlie successful context encoding when items were either repeatedly encoded in the same context or in different contexts. Moreover, results from the EEG analyses suggested that repetition effects predict subsequent source memory performance when they occur in a similar time window as the late parietal component, which is commonly related to recollection. Taken together, the present research advances our understanding of repeated encoding of item and source memory information and leads to novel directions for future research.

Item Type: Thesis (Doctoral)
Faculty \ School: Faculty of Social Sciences > School of Psychology
Depositing User: Bruce Beckett
Date Deposited: 20 Jul 2018 10:56
Last Modified: 20 Jul 2018 10:56

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