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[RATIO OF PREFRONTAL CORTEX NEURAL ACTIVITY BOTH HEMISPHERES DURING TASK OF CHOICE IN THE TWO-RING MAZE]
Rossiiskii Fiziologicheskii Zhurnal Imeni I.M. Sechenova
|September 8, 2018
Summary
Neural activity in rat prefrontal cortex shows hemispheric balance shifts. The right hemisphere dominates during learning and external cue use, while the left hemisphere is more active when no external cues guide behavior.
Area of Science:
- Neuroscience
- Cognitive Neuroscience
- Behavioral Neuroscience
Background:
- The prefrontal cortex (PFC) plays a crucial role in executive functions and decision-making.
- Hemispheric specialization in the PFC is well-documented, but its dynamic interplay during adaptive behavior requires further investigation.
- Understanding neural activity patterns in both hemispheres is key to deciphering complex cognitive processes.
Purpose of the Study:
- To investigate the differential neural activity in the left and right prefrontal cortex during a two-ring maze task.
- To examine how external cues and reinforcement conditions influence hemispheric balance in neural activity.
- To elucidate the role of each hemisphere in learning and adaptive behavioral responses.
Main Methods:
- Neuronal activity was recorded from 55 neurons in the left PFC and 47 neurons in the right PFC of rats.
- Behavioral tasks were conducted under two conditions: 'with a key' (specific cue reinforcement) and 'without a key' (any choice reinforcement).
- Differential neural activity was quantified by comparing firing rates between hemispheres during correct and error trials.
Main Results:
- A prevalence of differential neural activity in the left hemisphere was observed when rats were not guided by external cues (no-key trials or error trials with key).
- Conversely, the right hemisphere showed a prevalence of differential activity during correct trials in the 'with a key' condition.
- These findings suggest a dynamic shift in hemispheric balance depending on task demands and internal/external conditions.
Conclusions:
- The study provides evidence for dynamic changes in hemispheric balance within the rat prefrontal cortex.
- The right hemisphere appears to play a significant role in learning and integrating external cues for adaptive behavior.
- Neural activity patterns reflect the brain's ability to adjust behavioral strategies based on environmental and internal factors.
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