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Brain bioenergetics and cognitive ability.

Caroline Rae¹, Richard B Scott, Martin Lee

¹Russell Cairns Unit, Radcliffe Infirmary, The University of Oxford, Oxford, UK. crae@biochem.usyd.edu.au

Developmental Neuroscience

|November 14, 2003

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Phosphorus metabolite ratios in the brain correlate with cognitive performance in males of all ages. Brain pH decreases with age, stabilizing in the late teens, but does not correlate with cognitive function in adults.

Area of Science:

Neuroscience
Biochemistry
Cognitive Science

Background:

In vivo (31)P magnetic resonance spectroscopy (MRS) allows non-invasive assessment of brain metabolites.
Previous studies suggest links between brain metabolism and cognitive function, but age-related changes require further investigation.

Purpose of the Study:

To investigate the relationship between brain phosphorus metabolite ratios, brain pH, and cognitive performance across a wide age range in males.
To explore age-dependent changes in brain pH and its potential link to neuronal density and cognitive function.

Main Methods:

Acquired in vivo (31)P MRS spectra from the brains of 101 males (aged 6-72 years).
Administered cognitive tests to 42 boys (6-13 years) and 26 adult males (22-56 years).
Analyzed correlations between phosphorus metabolite ratios (e.g., inorganic phosphate/adenosine triphosphate), brain pH, and cognitive scores.

Related Experiment Videos

Main Results:

Significant correlations were found between inorganic phosphate-containing (31)P peak ratios and cognitive task performance in both children and adults.
No significant change in the inorganic phosphate/adenosine triphosphate ratio was observed across the studied age range.
Brain pH significantly decreased with age, following a decaying exponential pattern, and did not stabilize until at least the late teens.

Conclusions:

Brain phosphorus metabolite ratios, particularly those involving inorganic phosphate, are associated with cognitive performance in males across development.
Brain pH exhibits an age-dependent decline that stabilizes in late adolescence, suggesting ongoing maturation processes.
The findings contribute to the metabolic versus histological debate regarding brain function and development.