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Cognitive potentials: ipsilateral corticocortical interconnections in prefrontal human cortex ablations
R Zappoli1, F Zappoli, A Versari
1Department of Neurological and Psychiatric Sciences, University of Florence, Italy.
Neuroscience Letters
|June 30, 1995
Summary
Frontal cortex ablations disrupt contingent negative variation (CNV) components. Bidirectional corticocortical pathways are crucial for generating auditory N100 and other CNV elements, particularly in prefrontal regions.
Area of Science:
- Neuroscience
- Cognitive Neuroscience
- Electrophysiology
Background:
- Contingent Negative Variation (CNV) reflects cognitive processes.
- Corticocortical connections are vital for brain function.
- Frontal regions play a key role in cognitive tasks.
Purpose of the Study:
- Investigate the role of corticocortical connections in CNV genesis.
- Examine CNV components in patients with frontal cortex ablations.
- Identify specific pathways involved in CNV generation.
Main Methods:
- Standard and topographic EEG mapping.
- Analysis of multicomponent CNV in patients and controls.
- CT/MRI for precise localization of frontal cortex ablations.
Main Results:
- CNV components (N100, P200, P300, early/late CNV) were unrecordable over ablated frontal areas.
- Absence of consistent CNV components in patients with frontal lesions.
- Evidence suggests frontal cortex is essential for these CNV components.
Conclusions:
- Bidirectional corticocortical pathways are critical for CNV genesis, especially the auditory N100.
- Specific pathways like the arcuate-superior longitudinal and occipito-frontal fasciculi are implicated.
- Conduction time along these pathways likely explains latency differences in CNV components.