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Functional organisation of the saccadic reference system processing extraretinal signals in humans
P N Tobler1, J Felblinger, M Bürki
1Institute of Psychology, University of Bern, Berne, Switzerland.
Vision Research
|April 27, 2001
Summary
This study used functional magnetic resonance imaging (fMRI) to reveal a parieto-frontal network active during eye movement processing. This network is crucial for using internal eye movement signals, not just visual input.
Area of Science:
- Neuroscience
- Cognitive Neuroscience
- Neuroimaging
Background:
- Extraretinal signals are crucial for accurate eye movement control.
- Understanding the neural basis of processing these internal signals is key to comprehending sensorimotor transformations.
Purpose of the Study:
- To investigate the specific neuronal network engaged in processing extraretinal signals during sequential eye movements.
- To differentiate brain activity related to extraretinal versus retinal signal processing.
Main Methods:
- Functional magnetic resonance imaging (fMRI) was employed.
- The double step saccade paradigm was used, requiring subjects to make two sequential eye movements.
- A control condition using only retinal signals was compared against the experimental condition.
Main Results:
- A distinct parieto-frontal cortical network was activated during the processing of extraretinal signals.
- Key activated regions included the lateral intraparietal area, precuneus, insula, inferior frontal gyrus, and anterior cingulum.
Conclusions:
- The identified parieto-frontal network plays a significant role in utilizing extraretinal information for eye movement planning and execution.
- This finding advances our understanding of the neural mechanisms underlying sensorimotor control beyond purely visual feedback.