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Title: The effect of intention and repetition on the formation of visual long-term feature conjunctions in the figure-ground stimuli of the unitisation effect
Author: Aitken , Susan J.
Awarding Body: Lancaster University
Current Institution: Lancaster University
Date of Award: 2011
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How do we remember the features associated with an object? The key aim of this series of studies was to investigate the role of intention and repetition on visual long-term representations of feature conjunctions, and whether this was object or feature-based. In other words, can features be conjoined without the intention to do so during one presentation, or is more than one presentation needed and is this conjunction mediated by objectness? The unitisation paradigm was chosen to investigate binding and intention, as earlier work had reliably demonstrated ./ feature binding mediated via objectness. Unitary stimuli (features associated in one object) and non-unitary stimuli (features associated with different objects) can be used to show that even when features are perceptually at the same location in the 2D picture plane, they are conjoined more easily in memory if they appear to belong to the same objects. Inprevious studies employing these stimuli, the role of intention was not closely monitored,or examined in detail, and the effect of repetition wasn't looked at all. The basic methodology employed was that of a 2D mental rotation task, followed by a surprise one-from-four recognition test. The results indicated that when no conscious intention to remember the feature conjunction was employed, participants required more than one presentation of stimuli in order to reliably conjoin features in long-term visual memory. Features from unitary stimuli were recognised more often than those from non-unitary stimuli, replicating previous studies into the unitisation effect and demonstrating a clear object-based effect. Interestingly, not all features produced equal levels of performance. Colour-fonn stimuli showed the strongest and clearest demonstration, pattern-form was less strong and brightness/grey-form conjunction memOlY was weaker still. Analysis suggested that there was, ing different about brightness, in that there was no automatic encoding of the feature conjunctions. It was concluded that feature conjunction was mediated via objectness with the proviso that with unintentional encoding stimuli must be presented more than once.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available