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Title: View specificity in object processing : the role of alignment
Author: Stephen, D. W. S.
Awarding Body: University of Aberdeen
Current Institution: University of Aberdeen
Date of Award: 1993
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The circumstances under which an alignment process is used in processing different views of objects was investigated in a group of fourteen experiments. Five experiments are described in which two pictures of real, three dimensional objects are presented simultaneously on a monochrome monitor until the subjects make their decision. Eight further experiments are described in which the method of presentation was successive with the an initial stimulus presentation of 600ms followed by an inter-stimulus interval of 800ms and then a second stimulus which was present until the subject responded. In both cases the subjects' task was to decide, as rapidly as possible, whether the two pictures were of the same object. Responses were considered for sequences that contained two frames of the same object, with either no angular disparity between the frames, an angular difference of 45 degrees or an angular difference of ninety degrees. A variety of stimuli were used which were split into four groups. Common inter-class, novel inter-class, common intra-class and novel intra-class. Inter-class objects were defined as those objects that possessed very different structural features from each other, whereas intra-class objects shared many structural features. Response latency was unaffected by a change in angle between the frames if the object set was inter-class common objects. Response latency increased as angular disparity between the frames increased if the objects were novel inter-class, novel intra-class or common inter-class. This pattern of results was evident in both the successive and simultaneous designs. No experiment showed evidence of a preference for one particular view orientation over any other. The data suggests the existence of at least two different methods of visual processing.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available