Proposal for human visual pathway in the extrastriate cortex by fiber tracking method using diffusion-weighted MRI

NeuroImage

Gangwon Jeong¹  Sang-Han Choi²  Zang-Hee Cho²  Young-Bo Kim³ 

[1] Advanced Institute of Convergence Technology, Seoul National University, 145 Kwangkyo-Ro Yongtong-gu, Suwon-si, Gyeonggi-do, 16229, South Korea;Neuroscience Convergence Center, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea;Neuroscience Research Institute, Gachon University, 1198 Kuwol-dong, Namdong-gu, Incheon, 21565, South Korea;

关键词: Visual pathway;    Dorsal stream;    Vertical occipital fasciculus;    Angular gyrus;    Fiber tracking;    Human connectome project;   

DOI  :  

来源: DOAJ

【 摘 要 】

The extrastriate cortex in the human visual cortex is divided into two distinct clusters: the “what-information” processing area and the “where-information” processing area. It is widely accepted that the “what-information” cluster is processed through the ventral stream to the temporal cortex, and the “where-information” cluster through the dorsal stream to the parietal cortex. In human neuroanatomy, fiber bundles for the ventral stream (such as the inferior longitudinal fasciculus) are well defined, whereas fibers for the dorsal stream are poorly understood. In this study, we attempted to trace the dorsal stream fibers using a fiber tracking method using 7.0T diffusion-weighted MRI. We used data from a healthy male subject as well as from an unbiasedly selected nine-subject dataset in the Human Connectome Project. The surface of the visual area, including V1, V2, V3, V4, MT, was determined from the Brainnetome atlas (Fan et al., 2016), which is the connectivity-based parcellation framework of the human brain. The resulting visual pathway indicated that the putative pathway for the classical dorsal stream is unlikely to exist. Instead, we demonstrated that fiber connections exist between the angular gyrus with MT in the visual cortex, and between the angular gyrus and IT in the temporal cortex. Through that, we composed a two-pathway model for where-information processing that passes through the angular gyrus. Finally, we proposed a modified human visual pathway model based on our fiber tracking results in this report. The modified where-information pathway will provide a new aspect for the study of human visual processing.

【 授权许可】

Unknown