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Previous research in pigeons has indicated that there might be functional segregations in visual processing between the anterior and posterior regions of the entopallium. We chose to investigate how these regions differentially process moving (dynamic) and non-moving (static) presentations of two human actions, Indian dance and martial arts. Six pigeons learned a go/no-go action categorization ... read moretask, with reinforcement being conditional upon the presentation type. Three subjects received lesions to the posterior entopallium and three received lesions to the anterior entopallium. Posterior lesions impaired performance on both dynamic and static presentations, whereas anterior lesions had little, if any effect on performance in either presentation type. These results, along with prior studies, suggest that motion information is almost exclusively routed through the posterior entopallium, whereas static information is more widely distributed between both the anterior and posterior entopallium. Additionally, neither lesion had any detectable effect on categorization of these actions, which reveals that the entopallium as a whole is not critical for maintaining conceptual knowledge and is more important for building a percept of incoming visual information.read less
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