Eye Movement Network Originating from Frontal Eye Field: Electric Cortical Stimulation and Diffusion Tensor Imaging

• DOI: 10.2176/nmc.oa.2020-0306
• Publication Date: 2021-01-27T22:07:14Z
• Authors: Yusuke KIMURA; Rei ENATSU; Rintaro YOKOYAMA; Hime SUZUKI; Ayaka SASAGAWA; Tsukasa HIRANO; Masayasu ARIHARA; Tomoyoshi KURIBARA; Satoko OCHI; Nobuhiro MIKUNI
• Keywords: 03 medical and health sciences; Diffusion Tensor Imaging; 0302 clinical medicine; Eye Movements; Subthalamic Nucleus; Deep Brain Stimulation; Humans; Original Article; Electric Stimulation; Frontal Lobe

This study investigated the networks originating from frontal eye fields (FEFs) using electric cortical stimulation and diffusion tensor imaging (DTI). Seven patients with intractable focal epilepsy, in which FEFs were identified by electrical cortical stimulation, were enrolled in this study. Electric stimulation at 50 Hz was applied to the electrodes for functional mapping. DTI was used to identify the subcortical fibers originating from the FEFs with two regions of interests (ROIs) in the FEF and contralateral paramedian pontine reticular formation (PPRF). FEFs were found in the superior precentral sulcus (pre-CS) in six patients and superior frontal gyrus (SFG) in three patients. DTI detected fibers connecting FEFs and contralateral PPRFs, passing within the internal capsule. The fibers were located close to the lateral antero-superior border of the subthalamic nucleus (STN) and medial posterior border of the globus pallidus internus (GPi). This study found the characteristic subcortical networks of the FEF. These tracts should be noted to prevent complications of deep brain stimulation (DBS) of the STN or GPi.