Apr 12, 2013

Selectivity to translational egomotion in human brain motion areas

PloS One
Sabrina PitzalisGaspare Galati

Abstract

The optic flow generated when a person moves through the environment can be locally decomposed into several basic components, including radial, circular, translational and spiral motion. Since their analysis plays an important part in the visual perception and control of locomotion and posture it is likely that some brain regions in the primate dorsal visual pathway are specialized to distinguish among them. The aim of this study is to explore the sensitivity to different types of egomotion-compatible visual stimulations in the human motion-sensitive regions of the brain. Event-related fMRI experiments, 3D motion and wide-field stimulation, functional localizers and brain mapping methods were used to study the sensitivity of six distinct motion areas (V6, MT, MST+, V3A, CSv and an Intra-Parietal Sulcus motion [IPSmot] region) to different types of optic flow stimuli. Results show that only areas V6, MST+ and IPSmot are specialized in distinguishing among the various types of flow patterns, with a high response for the translational flow which was maximum in V6 and IPSmot and less marked in MST+. Given that during egomotion the translational optic flow conveys differential information about the near and far external objects, are...Continue Reading

Mentioned in this Paper

Neuro-Oncological Ventral Antigen 2
Structure of Intraparietal Sulcus
Visual System
Groove
Occipital Lobe
Cardinalis cardinalis
Entire Chin
Neurons
Fundus
Brain

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