Title:Visual Motion Processing Areas in the Human Brain Based on a Wide-Field Retinotopic Mapping Technique
Volume: 5
Issue: 2
Author(s): Miaomiao Liu , Guangying Pei, Ruolan Bai , Nan Mu , Xiaoshan Bi , Wenhui Wang, Bin Wang , Jinglong Wu , Qiyong Guo and Tianyi Yan*
Affiliation:
- Key Laboratory of Convergence Medical Engineering System and Healthcare Technology, The Ministry of Industry and Information Technology, Beijing Institute of Technology, Beijing,China
Keywords:
Wide field, retinotopic mapping technique, MT+/V5, fMRI, visual area, human brain.
Abstract: Introduction: The wide-field visual cortex, known as MT+/V5 and V6 plays a major role in
the visual processing of motion in the brain. In the current study, we located the MT+/V5 complex,
which was divided into three sub-regions: the middle temporal (MT) area for central stimuli and the
medial superior temporal (MST) area and V6 for peripheral stimuli. Previous studies of these areas were
typically limited to the central (eccentricity is from 8° to 30°) visual fields.
Methods: Using a wide-view presentation system, we presented a horizontal and vertical visual angle
up to 120° in a functional magnetic resonance imaging (fMRI) environment.
Result: Our results suggest that the MT+ area is significantly larger than indicated by previous studies
on wide-field stimuli. The MST and V6 areas responded strongly to peripheral stimulation, and the
MST responded strongly to ipsilateral stimulation, while MST also responded to central stimulation.
Conclusion: Furthermore, we also used retinotopic mapping with stimuli consisting of motion dots to
localize the MT+ and the wide-field motion area V6. The retinotopic maps divided the composition of
the visual field maps into four segments within a functionally subdivided MT+.
