YNICL Journal 2021 Journal Article
Impaired perception of illusory contours and cortical hypometabolism in patients with Parkinson’s disease
- Toshiyuki Ishioka
- Kazumi Hirayama
- Yoshiyuki Hosokai
- Atsushi Takeda
- Kyoko Suzuki
- Yoshiyuki Nishio
- Yoichi Sawada
- Nobuhito Abe
F-fluorodeoxyglucose positron emission tomography (FDG-PET) to measure regional cerebral glucose metabolism in PD patients. Although there were no significant differences in the stimulus durations required for perception of illusory contours formed by aligned line ends between PD patients and controls, PD patients required significantly longer stimulus durations for the perception of Kanizsa illusory figures. Difficulty in perceiving Kanizsa illusory figures was correlated with hypometabolism in the higher-order visual cortical areas, including the posterior inferior temporal gyrus. These findings indicate an association between dysfunction in the posterior inferior temporal gyrus, a region corresponding to a portion of the LOC, and impaired perception of Kanizsa illusory figures in PD patients.