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Topographical Estimation of Visual Population Receptive Fields by fMRI
Published on: February 3, 2015
Human fMRI reveals that delayed action re-recruits visual perception.
Anthony Singhal1, Simona Monaco, Liam D Kaufman
1Department of Psychology and Centre for Neuroscience, University of Alberta, Edmonton, Alberta, Canada.
Plos One
|September 17, 2013
Summary
Delayed actions involve distinct brain activity compared to immediate ones. Researchers found reactivation of visual areas during delayed action execution, suggesting a need for visual information retrieval for motor programming.
Area of Science:
- Cognitive Neuroscience
- Neuroimaging
- Motor Control
Background:
- Behavioral and neuropsychological studies suggest distinct neural mechanisms for immediate versus delayed actions.
- The specific brain regions supporting delayed action planning and execution remain largely unidentified.
Purpose of the Study:
- To investigate human brain activation patterns during delayed grasping and reaching actions using fMRI.
- To differentiate neural substrates involved in visual processing, memory, and action execution separated by a delay interval.
Main Methods:
- Functional magnetic resonance imaging (fMRI) was employed to measure brain activity in human participants.
- Participants performed delayed grasping and reaching tasks with a 18-second delay for action memory.
- Brain activation was analyzed during visual stimulation, the delay period, and action execution.
Main Results:
- Reactivation of the lateral occipital complex (LOC) and early visual cortex (EVC) was observed during action execution, even in darkness.
- Sustained activation was noted in dorsal stream areas (aIPS, PMd, M1, SMA) during the delay phase.
- EVC showed greater activation for grasping than reaching during both visual input and action execution.
Conclusions:
- Delayed actions recruit dorsal stream areas for maintaining action goals, but require re-engagement of ventral and early visual areas for detailed visual information during motor programming.
- This reactivation of visual processing areas during delayed action execution highlights their crucial role in retrieving object representations for precise motor commands, especially for grasping.
