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Neurophysiological correlates of tactile width discrimination in humans
Carla Pais-Vieira1, Mehrab K Allahdad1, André Perrotta2
1Centro de Investigação Interdisciplinar em Saúde (CIIS), Instituto de Ciências da Saúde (ICS), Universidade Católica Portuguesa, Porto, Portugal.
Frontiers in Human Neuroscience
|May 30, 2023
Summary
This study reveals how the human brain processes tactile width discrimination using electroencephalography (EEG). Fronto-parietal brain regions track performance differences between individuals, while parieto-occipital regions track changes within individuals.
Area of Science:
- Neuroscience
- Sensory Processing
- Human Motor Control
Background:
- Tactile information processing integrates sensory, motor, and cognitive functions.
- Width discrimination is crucial for tactile perception but less studied in humans than in rodents.
Purpose of the Study:
- To describe neural activity changes during tactile width discrimination in humans using EEG.
- To correlate specific neural activity patterns with task performance.
Main Methods:
- Electroencephalography (EEG) was employed to record brain activity in human participants.
- Participants performed a tactile width discrimination task.
- Analysis focused on power changes across frequency bands and information transfer (Granger causality).
Main Results:
- An asymmetrical fronto-temporo-parieto-occipital network showed engagement during discrimination and response periods.
- Frontal-parietal electrode activity correlated with between-subjects performance, while parieto-occipital activity correlated with within-subjects performance.
- Improvements in performance were linked to altered information transfer to parietal electrodes.
Conclusions:
- Tactile width discrimination involves a complex, asymmetrical neural network.
- Distinct brain regions (fronto-parietal vs. parieto-occipital) encode performance at different levels (between- vs. within-subjects).
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