Nuclear medical PET-study in the causal relationship between mastication and brain function in human evolutionary and...

Area of Science:

• Neuroscience
• Evolutionary Biology
• Anthropology

Background:

• The popular notion that thorough chewing benefits cognitive function lacks direct scientific evidence.
• The relationship between mastication and brain development throughout human evolution remains unclear.
• Evidence-based medicine (EBM) necessitates a review of mastication's impact on brain function.

Purpose of the Study:

• To investigate the causal relationship between mastication and brain function within the context of human evolution.
• To explore the effects of chewing on cortical cell activation using modern imaging techniques.
• To provide a scientific basis for understanding mastication's role in human development.

Main Methods:

• Utilized positron-emission tomography (PET) with H215O injection to examine brain activity during gum chewing in humans.
• Analyzed regional brain activation patterns, focusing on cortical areas.
• Correlated findings with fossil records and evolutionary changes in diet and cranial capacity.

Main Results:

• PET scans revealed significant activation of cortical cells in multiple brain regions, particularly near the central sulci.
• Activated areas observed during mastication align with previous region of interest (ROI) analyses.
• Evolutionary data shows a correlation between dietary shifts, increasing cranial capacity, and brain development.

Conclusions:

• Mastication demonstrably activates cortical cells, suggesting a link to cognitive processes.
• Human fossil records and evolutionary dietary patterns offer insights into brain development.
• Modern child-rearing practices could benefit from understanding ancestral feeding habits to promote optimal brain development.