Event related brain potential studies of strategic retrieval processing in episodic memory

Dzulkifli, Mariam Adawiah 2005. Event related brain potential studies of strategic retrieval processing in episodic memory. PhD Thesis, Cardiff University.

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Abstract

The relationship between three classes of retrieval processes -- orientation, effort and success -- was investigated using event-related potentials (ERPs) and behavioural measures. Participants studied words in two different contexts in 5 experiments. In subsequent test phases they responded positively to old words from one study context (targets), and negatively to old words from the alternate context (non-targets) as well as to new words. In experiments 1-4 participants completed different study-test cycles across which target designation was varied. The contrasts between the ERPs evoked by new test words separated according to target designation in Experiment 1 revealed correlates of processes that form part of a retrieval attempt, but in that experiment effort and orientation were confounded. In Experiment 2, effort and orientation were systematically manipulated. The key finding was that the degree of engagement in an orientation varies with task difficulty. In Experiment 3 differences between ERPs elicited by new words were different to those in Experiments 1 and 2, providing support for the concept of orientation as different encoding tasks were employed in Experiment 3. These correlates of retrieval orientation were proposed to influence selective recollection, because the left-parietal old/new effect -- the ERP signature of recollection -- was evident for targets and not for non-targets in Experiment 3. This hypothesis was supported by the findings in Experiment 4, where left-retrieval old new effect were evident for both targets and non-targets, while indices of orientation were less evident than in Experiment 3

Item Type:	Thesis (PhD)
Status:	Unpublished
Schools:	Psychology
Subjects:	B Philosophy. Psychology. Religion > BF Psychology
Date of First Compliant Deposit:	30 March 2016
Last Modified:	08 Sep 2022 12:41
URI:	https://orca.cardiff.ac.uk/id/eprint/55403

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