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Published on: September 10, 2018
Beta oscillations in the monkey sensorimotor network reflect somatosensory decision making
Saskia Haegens1, Verónica Nácher, Adrián Hernández
1Donders Institute for Brain, Cognition, and Behaviour, Radboud University Nijmegen, 6500HB, Nijmegen, The Netherlands.
Summary
Beta band oscillations in the sensorimotor network are crucial for decision-making during vibrotactile tasks. This neural activity reflects evidence accumulation and processing, distinguishing correct from incorrect responses.
Area of Science:
- Neuroscience
- Systems Neuroscience
- Sensorimotor Systems
Background:
- Perceptual decision-making studies in monkeys have mapped distributed cortical areas for stimulus processing.
- The role of neural oscillations in sensorimotor decision-making networks remains largely unexplored.
Purpose of the Study:
- To investigate the role of neural oscillations in the sensorimotor network during a vibrotactile discrimination task.
- To understand how oscillatory activity relates to stimulus encoding, evidence accumulation, and decision outcomes.
Main Methods:
- Recorded local field potentials (LFPs) from sensorimotor cortical areas in a monkey performing a vibrotactile task.
- Analyzed oscillatory activity, particularly in the beta band, during different task phases.
- Utilized a control condition without decision-making demands to isolate task-specific neural activity.
Main Results:
- A stimulus-frequency-specific periodic response was observed in somatosensory regions during stimulus presentation, distinct from entrainment.
- Beta band oscillations showed categorical responses during the comparison and decision period, differentiating correct from incorrect decisions.
- This differential beta activity was absent in a control condition, ruling out motor plan maintenance as the sole explanation.
Conclusions:
- Beta band oscillations play a significant role in reflecting the dynamics of decision-making within the sensorimotor network.
- These oscillations are involved in the temporal and spatial accumulation and processing of evidence leading to a decision.
- The findings highlight beta oscillations as a key neural mechanism underlying perceptual decision-making.
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