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Hemispheric differences in electrical and hemodynamic responses during hemifield visual stimulation with graded
Juanning Si1,2, Xin Zhang1,2, Yujin Zhang1,2
1Brainnetome Center, Institute of Automation, Chinese Academy of Sciences, Beijing 100190, China.
Biomedical Optics Express
|July 25, 2017
Summary
This study used electroencephalography (EEG) and functional near-infrared spectroscopy (fNIRS) to examine visual cortex responses. Results reveal paradoxical EEG lateralization and a linear correlation between neuronal and hemodynamic responses to visual stimuli.
Area of Science:
- Neuroscience
- Cognitive Science
- Biomedical Engineering
Background:
- Understanding visual cortex function requires integrating neuronal and hemodynamic activity.
- Hemispheric specialization in visual processing is complex and not fully understood.
Purpose of the Study:
- To investigate retinotopic mapping and hemispheric differences in visual cortex activity.
- To explore neurovascular coupling using multimodal neuroimaging.
Main Methods:
- Utilized a multimodal neuroimaging technique combining electroencephalography (EEG) and functional near-infrared spectroscopy (fNIRS).
- Employed horizontal hemifield visual stimuli with varying contrast levels.
- Analyzed neuronal activity, hemodynamic response, and neurovascular coupling.
Main Results:
- fNIRS showed expected contralateral activation for visual stimuli.
- EEG revealed paradoxical ipsilateral maximal response with contralateral polarity inversion.
- Both neuronal and hemodynamic responses exhibited logarithmic changes with stimulus contrast.
- Visual evoked potentials (VEPs) amplitudes and latencies linearly correlated with hemodynamic responses.
Conclusions:
- Paradoxical EEG lateralization may stem from polarity inversion and latency advantages.
- Neurovascular coupling in the visual cortex is linearly correlated despite differing response dynamics.
- Multimodal neuroimaging provides a comprehensive view of visual processing.
