Abstract
Otsuki had conducted categorical naming tasks on aphasia patients with categorical naming disorder, and reported a case in which the difference in performance was shown between "round objects" and "non-round objects", and showed that visual elements such as shape may have some influence on the recalling process [1]. Yamanoi et al. had presented images of a quadruped animal and measured EEGs from the subjects during recalling their names [3]. The equivalent current dipole localization (ECDL) estimation was done to these EEGs. As a result, activities were estimated in areas related to visual cortex, memory, language cortex, etc., such as V1, hippocampus, and Broca's area. In images of typical animals with almost round shape, such as dogs and bears, brain activity was not estimated in the right angular gyrus (AnG), but brain activity was estimated in the right AnG in atypical animals such as giraffes. In this study, the authors measured the EEGs from five subjects during the image recognition process of quadruped animals as well as during the recalling process of them. After analysis of EEGs by ECDL method, they compared the activities between two processes. In case of the image recognition process, no activity on the right AnG was observed in dogs in common with all subjects. For images of giraffe, brain activity was observed on the right AnG in all subjects, and these tendencies were the same to those of the estimated brain activity. But activities were observed on the right AnG for bear and lion in some subjects. And in case of the name recalling process, brain activity was observed on the right AnG in all subjects for image of giraffe. No activity on the right AnG was observed for round shape quadruped in common with all subjects on the right AnG, except one estimation for only one subject.
