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The role of human psoterior parietal cortex in representing a limited number of objects
Unpublished PhD Thesis, University of Cambridge
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This thesis uses behavioural paradigms in conjunction with functional magnetic resonance imaging and magnetocephalographym to explore the sensitivity of activity across the human brain to variations in visual object load. A particular focus on the PPC addresses the hypothesis that it has a role in object individuation, distinct from the functions traditionally ascribed to it. Requirements to selectively attend to objects, or to store them in short-term memory, are manipulated in order to investigate the extent to which load-sensitive brain activity reflects these functions per se, or reflects underlying object representations on which they operate. Sensitivity to object location and task difficulty are also discussed, with neither adequately accounting for the load-related response.