Small animals such as the marmoset tend to have smooth brains, while in larger mammals such as the whale or elephant the grey matter is highly convoluted. The larger the animal, the more convoluted this grey matter is. Normally, gray matter represents information processing centers in the brain, and white matter represents the networking of – or connections between – these processing centers.
The more gray matter you have in the decision-making, thought-processing part of your brain, the better your ability to evaluate rewards and consequences. Scientists observed significant positive correlations between gray matter volume in elderly persons and measures of semantic and short-term memory. While 20% of all oxygen taken in by the body goes to the brain, 95% of that goes specifically into the grey matter. The gray matter includes regions of the brain involved in muscle control, and sensory perception such as seeing and hearing, memory, emotions, speech, decision making, and self-control. Functions and Characteristic of Gray Matters It travels down the spinal cord in three gray columns. Grey matter is present in the brain as well as in the spinal cord. It is also found in the deeper parts of the cerebrum, and hippocampus.
Gray matter mainly located on the surface of the cerebral cortex, and on surface of the cerebellum.
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