Influences of context on object detection and identification in natural scenes
| Autor: | LaPointe, Mitchell R. P. |
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| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: | |
| Druh dokumentu: | Diplomová práce |
| Popis: | The way we perceive complex visual scenes has been an area of much research and debate. Many studies have found that the context of a scene is used to guide attention to important and relevant areas of a scene. Other studies, however, have found that objects that are incongruent with the scene context capture attention. These contradictory findings have been found both within and across tasks. The purpose of the present research was to reconcile these contradictory results. Two processes were identified as underlying complex scene perception: object detection and object identification. Further, the current research demonstrates the relative weighting of these processes differs according to task demands; some tasks weight object detection more heavily, whereas other tasks weight object identification more heavily. Moreover, it was demonstrated that the weighting of these processes can be manipulated within a task in such a way as to produce either congruency benefits or costs. Finally, in circumstances in which processing is weighted in favour of object detection, it was demonstrated that eye gaze, and presumably overt attention, is captured by semantically incongruent objects early into scene perception. The current research helps our understanding of complex scene perception by reconciling contradictory findings reported in previous studies. In particular, two processes were identified: object identification, which relies on a congruent context, and object detection, which relies on an incongruent context. In this way, past experience may promote efficient scene perception by promoting the use of regularities in the environment (e.g., congruent context), but also leaving the attention system sensitive to areas of the scene that contradict the expectations set by the context (e.g., incongruent objects). Thesis Doctor of Philosophy (PhD) The way that we perceive and create mental representations of our visual world has been an area of debate in cognitive psychology. The research attempting to address these issues has reported contradictory findings. For example, some studies have shown that the context of a scene is important for efficient perception of that scene and its parts. Other studies, however, have shown that the context of a scene can undermine efficient perception of scenes. The current research identifies two distinct processes that underlie complex scene perception. One process appears to benefit from a congruent context, whereas the other appears to benefit from an incongruent context. Further, the weighting of these two processes can produce context congruency benefits in some experimental situations and congruency costs in others. Finally, it appears as though when processing is weighted towards congruency costs, attention is attracted to incongruent objects early into scene processing. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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