| dc.contributor.author | Large, Mary-Ellen. | en_US |
| dc.date.accessioned | 2014-10-21T12:38:55Z | |
| dc.date.available | 2004 | |
| dc.date.issued | 2004 | en_US |
| dc.identifier.other | AAINQ83706 | en_US |
| dc.identifier.uri | http://hdl.handle.net/10222/55930 | |
| dc.description | An implicit assumption of cognitive research into the allocation of global and local attention is its importance during the visual recognition of objects and scenes in real world contexts. However, most of the knowledge accumulated about global and local attention is based on effects of the recognition of artificial hierarchical stimuli (Navon figures) that bear little resemblance to naturally occurring objects. To this end, the thesis examined effects of global or local attention (using a divided attention task with hierarchical figures) as they primed subsequent detection of target objects at different levels of category identity (basic and subordinate). Target objects were identified among distractor objects that varied in their degree of visual similarity to the targets. If levels of attention priming affected the level of categorization (basic vs. subordinate) then attention selection is related to conceptual aspects of object recognition. Conversely, if levels of attention priming affected levels of distractor similarity (similar vs. dissimilar) then attention selection is related to earlier perceptual aspects of object recognition. | en_US |
| dc.description | Evidence was found to support a role for global and local processing in the recognition of real world objects. Global priming was beneficial for basic level target detections when objects were visually dissimilar, and local priming was beneficial for subordinate level target detections when objects were visually similar. Effects of attention priming were sensitive to visual similarity suggesting that global and local attention were strongly influenced by early perceptual processes. Global or local priming occurred in a flexible manner depending on the nature of the recognition task. It was proposed that global and local processing aids the selection of perceptual attributes of the object diagnostic for recognition, and that selection is based on two mechanisms; spatial extent and grouping/parsing operations. | en_US |
| dc.description | Thesis (Ph.D.)--Dalhousie University (Canada), 2004. | en_US |
| dc.language | eng | en_US |
| dc.publisher | Dalhousie University | en_US |
| dc.publisher | | en_US |
| dc.subject | Psychology, Cognitive. | en_US |
| dc.title | Global and local processing in object categorization. | en_US |
| dc.type | text | en_US |
| dc.contributor.degree | Ph.D. | en_US |
