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Categorisation effects on similarity judgements and object recognition
Başlık:
Categorisation effects on similarity judgements and object recognition
Yazar:
Archambault, Annie, author.
ISBN:
9780438060531
Yazar Ek Girişi:
Fiziksel Tanımlama:
1 electronic resource (191 pages)
Genel Not:
Source: Dissertation Abstracts International, Volume: 76-08C.
Advisors: Philippe Schyns.
Özet:
Theories of object recognition explain the preferred usage of an object dimension in terms of its usefulness (i.e., its diagnosticity) for the task at hand. However, the perception of the object dimensions itself has generally been neglected in object recognition. Is object perception independent of the task being executed, or does it change with the diagnosticity of object dimensions? The first part of this thesis presents three experiments that investigate the interactions between the perception of a dimension and its diagnosticity. Experiment 1 assessed the baseline perception of shape, colour and textural information using a same/different task. In Experiment 2, different participant groups learned to become perceptual experts with the information of a different dimension (shape, colour or texture). They were then tested on their perception of all dimensions in a same/different task. Experiment 3 tested whether the perceptual expertise acquired with a subset of dimensional values generalised to the entire dimension, or whether it was restricted to the learned values. Experiment 3 also examined whether participants who better perceived a dimension were better able to use it in a subsequent object recognition task. Results of Experiment 1 suggest that at short exposures, texture is harder to perceive than colour and than shape. However, with longer exposures, the differences between dimensions disappear and all dimensions become equally available. Results of Experiment 2 suggest that categorisation experience with colour and texture can improve texture perception at short exposures. In Experiment 3, results first show that the training effect observed in Experiment 2 was not restricted to the set of values used in the object training set: Training on a subset of dimensional values spread to the entire dimension. Furthermore, when performing a categorisation task, participants trained on texture used texture cues more efficiently than participants trained on colour and shape. The last two experiments of this thesis generalised the findings to the effect of categorisation on object recognition. More precisely, I examined the hypothesis that the nature of categorisation (basic vs. subordinate) can influence the perceived properties of an identical distal object. The nature of the relationship between levels of categorisation and object perception has so far been neglected. Are they intertwined, with people perceiving distal objects differently in basic or subordinate categories, or are they independent, with object perception being unaffected by the task at hand? Results of Experiment 4 revealed that identical object changes were perceived differently according to participants' categorisation background: participants were more sensitive to changes involving object categories that they had previously learned at a subordinate level, than objects that they had learned at a basic level. Experiment 5 demonstrated that results obtained in Experiment 4 were not due to a mere effect of differential weighting of attention between locations of the basic and subordinate objects. In sum, the results presented here demonstrate that the perception of objects' properties depends on previous experience with perceptual dimensions and object categorisations.
Notlar:
School code: 0547
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Yer Numarası | Demirbaş Numarası | Shelf Location | Lokasyon / Statüsü / İade Tarihi |
---|---|---|---|
XX(684822.1) | 684822-1001 | Proquest E-Tez Koleksiyonu | Arıyor... |
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