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. 1999 Nov 30;8(4):170–181. doi: 10.1002/(SICI)1097-0193(1999)8:4<170::AID-HBM2>3.0.CO;2-W

Relationship between ventral stream for object vision and dorsal stream for spatial vision: An fMRI+ERP study

Jiongjiong Wang 1,2,4,✉, Tiangang Zhou 1,2, Maolin Qiu 1,2, Antao Du 1,3, Kui Cai 1,3, Zhanli Wang 1,3, Cheng Zhou 1,3, Ming Meng 1,2, Yan Zhuo 1,2, Silu Fan 1,2, Lin Chen 1,2,✉
PMCID: PMC6873314  PMID: 10619412

Abstract

Recent imaging studies indicated the existence of two visual pathways in humans: a ventral stream for object and form vision and a dorsal stream for spatial and motion vision. The present study was motivated by a stimulating question: Supposing shape and motion are processed separately in the two pathways, how do the respective cortical areas respond to the stimuli of “forms defined by motion”? fMRI and ERP recordings were combined in order to measure the spatiotemporal activation pattern in the two pathways responding to forms defined by motion, which were produced solely by coherent movement of random dots against a background of dynamic or static random dots. The fMRI data indicated that the stimuli of forms defined by motion indeed activated both dorsal MT/V5 and ventral GTi/GF. Furthermore, the RV curves resulting from fMRI‐seeded dipole modeling indicated that each pair of dipoles located at MT/V5 or GTi/GF reached the same best‐fit point; a single pair of free dipoles located near the fMRI foci of MT/V5 and GTi/GF could be identified at the corresponding best‐fit point; and the source waveforms resulting from fixed dipole modeling also showed simultaneous activation of MT/V5 and GTi/GF dipoles in the time interval around the best‐fit point. The present results, therefore, suggest that MT/V5 and GTi/GF appear to be activated in parallel and simultaneously responding to forms defined by motion. Such findings raise interesting issues about the hierarchical organization and the functional specialization in the two pathways. Hum. Brain Mapping 8:170–181, 1999. © 1999 Wiley‐Liss, Inc.

Keywords: visual cortex, forms defined by motion, functional MRI, event‐related potential, dipole model, integration of fMRI and ERP, cognitive brain imaging

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Contributor Information

Jiongjiong Wang, Email: jwang@fmri.uchc.edu.

Lin Chen, Email: lchen@public2.bta.net.cn.

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