We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Distinct fMRI Responses to Self-Induced versus Stimulus Motion during Free Viewing in the Macaque.
- Authors
Russ, Brian E.; Takaaki Kaneko; Saleem, Kadharbatcha S.; Berman, Rebecca A.; Leopold, David A.
- Abstract
Visual motion responses in the brain are shaped by two distinct sources: the physical movement of objects in the environment and motion resulting from one's own actions. The latter source, termed visual reafference, stems from movements of the head and body, and in primates from the frequent saccadic eye movements that mark natural vision. To study the relative contribution of reafferent and stimulus motion during natural vision, we measured fMRI activity in the brains of two macaques as they freely viewed >50 hours of naturalistic videofootage depicting dynamic social interactions. We used eye movements obtained during scanning to estimate the level of reafferent retinal motion at each moment in time. We also estimated the net stimulus motion by analyzing the video content during the same time periods. Mapping the responses to these distinct sources of retinal motion, we found a striking dissociation in the distribution of visual responses throughout the brain. Reafferent motion drove fMRI activity in the early retinotopic areas VI, V2, V3, and V4, particularly in their central visual field representations, as well as lateral aspects of the caudal inferotemporal cortex (area TEO). However, stimulus motion dominated fMRI responses in the superior temporal sulcus, including areas MT, MST, and FST as well as more rostral areas. We discuss this pronounced separation of motion processing in the context of natural vision, saccadic suppression, and the brain's utilization of corollary discharge signals.
- Subjects
VISUAL perception; SACCADIC eye movements; MACAQUE behavior; FUNCTIONAL magnetic resonance imaging; BRAIN physiology
- Publication
Journal of Neuroscience, 2016, Vol 36, Issue 37, p9580
- ISSN
0270-6474
- Publication type
Article
- DOI
10.1523/JNEUROSCI.1152-16.2016