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Title: Representation development in associative systems
Author: Graham, S.
Awarding Body: University of Cambridge
Current Institution: University of Cambridge
Date of Award: 2000
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This thesis concerns the nature of representations, and the development of the associations that come to form between them. The first chapter introduces a number of theoretical approaches that have been postulated to explain associative learning in humans and other animals, and describes some of the evidence to which they have been applied. The picture that emerges highlights the proliferation of such theories, and their inadequacy in explaining disparate classes of phenomena. In Chapter 2, the effects of masked stimulus pre-exposure in humans are examined and it is concluded that, in the light of evidence from other studies, the effects are not comparable with those of non-masked pre-exposure in other animals. The results of masked pre-exposure in humans would seem to lie outside the scope of any associative theory, and may instead reflect the operation of strategic processes of attention, such as those of negative priming. In Chapter 3, the effects of non-masked pre-exposure to alternating compounds of stimuli are examined, and a probable explanation in terms of the inhibitory associations between these stimuli is favoured. This leads the way for Chapter 4, in which this explanation is developed and instantiated within a connectionist framework. This theoretical model is then further examined in relation to a broader range of phenomena that were considered in the Introduction. The thesis concludes with some comments on how the model might be extended to offer a fuller account of associative learning in both humans and other animals.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available