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Recruitment of the premotor cortex during arithmetic operations by the monkey
Sumito Okuyama1,2, Toshinobu Kuki1, Hajime Mushiake3
1Department of Physiology, Tohoku University School of Medicine, Sendai, 980-8575, Japan.
Scientific Reports
|March 29, 2024
Summary
This study reveals how the monkey brain
Area of Science:
- Neuroscience
- Cognitive Science
- Primate Studies
Background:
- Arithmetic operations are complex cognitive functions.
- The neural basis of numerical processing, particularly in the dorsal premotor cortex, is not fully understood.
- Understanding how the brain performs calculations is crucial for cognitive neuroscience.
Purpose of the Study:
- To investigate neuronal activity in the dorsal premotor cortex related to numerical addition and subtraction in monkeys.
- To determine if arithmetic representations transform into motor commands.
- To explore the link between numerical cognition and motor control.
Main Methods:
- Recording neuronal activity in the dorsal premotor cortex of monkeys during arithmetic tasks.
- Analyzing neural coding for arithmetic operations (addition, subtraction).
- Employing multivariate decoding techniques to predict behavior from neural activity.
Main Results:
- Identified specific neuronal activity in the dorsal premotor cortex associated with arithmetic.
- Observed a transformation of arithmetic coding into motor representations (hand choice, step count).
- Found right-hand cells encoded addition, left-hand cells encoded subtraction, indicating intertwined processing.
- Decoding models accurately predicted both arithmetic decisions and subsequent motor actions.
Conclusions:
- The dorsal premotor cortex plays a role in numerical operations.
- Arithmetic processing involves a transformation into motor commands, suggesting neural repurposing.
- Motor cortex functions may extend to support abstract cognitive processes like arithmetic.
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