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A Large Lateral Craniotomy Procedure for Mesoscale Wide-field Optical Imaging of Brain Activity
Published on: May 7, 2017
Correlation of activation sizes between lateral geniculate nucleus and primary visual cortex in humans
1Center for Magnetic Resonance Research, Department of Radiology, University of Minnesota School of Medicine, 2021 6th Street SE, Minneapolis, MN 55455, USA. wei@cmrr.umn.edu
Magnetic Resonance in Medicine
|February 17, 2001
Summary
This study found a strong linear correlation between activation sizes in the lateral geniculate nucleus (LGN) and primary visual cortex (V1) during visual stimulation. High-resolution fMRI successfully quantified this spatial correlation between these visual pathway areas.
Area of Science:
- Neuroimaging
- Visual Neuroscience
- Human Brain Imaging
Background:
- The lateral geniculate nucleus (LGN) and primary visual cortex (V1) exhibit retinotopic organization.
- A functional correlation in activation sizes between LGN and V1 is expected during visual stimulation.
- Detecting small LGN activations in the thalamus is challenging for many neuroimaging techniques.
Purpose of the Study:
- To investigate the functional correlation of activation sizes between the LGN and V1.
- To assess this correlation during full-field and hemifield visual stimulation.
- To evaluate the capability of high-resolution fMRI for quantifying subcortical-cortical spatial correlations.
Main Methods:
- Utilized high-resolution functional magnetic resonance imaging (fMRI) at 4 Tesla.
- Employed a large visual field stimulus.
- Compared V1 and LGN activation size ratios between left and right hemispheres within subjects.
Main Results:
- Demonstrated a significant linear correlation between the functional activation size ratios of LGN and V1 (correlation coefficient = 0.96).
- Confirmed the efficacy of fMRI in quantifying spatial correlations between cortical (V1) and subcortical (LGN) activations.
- Showcased the ability to detect and measure LGN activation with high-resolution fMRI.
Conclusions:
- A strong functional correlation exists between LGN and V1 activation sizes.
- High-resolution fMRI is a capable tool for quantifying spatial relationships between cortical and subcortical brain regions.
- This study provides evidence for the linked functional organization of subcortical and cortical visual pathways.
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