Exercise increases information content and affects long-term stability of hippocampal place codes

Area of Science:

• Neuroscience
• Exercise Physiology

Background:

• Physical exercise is recognized for enhancing cognitive functions like memory.
• The specific impact of exercise on the brain's neural code remains largely unexplored.

Purpose of the Study:

• To investigate how voluntary exercise influences the quality and long-term stability of hippocampal place codes.
• To understand the neural mechanisms underlying exercise-induced cognitive benefits.

Main Methods:

• Utilized calcium imaging in freely behaving mice to monitor neural activity.
• Analyzed the emergence and stability of hippocampal place codes in exercising and sedentary groups.
• Employed model-based simulations to interpret findings.

Main Results:

• Running accelerated the development of more informative spatial representations in novel environments.
• Exercise increased the long-term stability of hippocampal place codes over days and weeks.
• Runners exhibited a faster rate of place code change when controlling for code quality, suggesting enhanced dynamism.

Conclusions:

• Exercise promotes a more informative and dynamically stable hippocampal place code.
• This enhanced neural code may underlie the cognitive benefits associated with physical activity.
• A combination of improved code quality and faster representational drift contributes to exercise-induced neural adaptations.