The phrase "average gray matter" is correct and usable in written English.
It can be used in contexts discussing brain anatomy, neuroscience, or psychology, particularly when comparing brain structures or functions.
Example: "Research indicates that individuals with higher cognitive abilities often have more than just average gray matter in specific regions of the brain."
Alternatives: "typical gray matter" or "standard gray matter".
Experimental mice have been telling us this for years, but pot-smoking humans didn't want to believe it could happen to them: Compared with a person who never smoked marijuana, someone who uses marijuana regularly has, on average, less gray matter in his orbital frontal cortex, a region that is a key node in the brain's reward, motivation, decision-making and addictive behaviors network.
The brain variables in these analyses are the unsmoothed average "modulated" gray matter density in a whole-hippocampal or amygdala region of interest drawing.
We present no average T score showing gray matter increase (only 1 study reported increase in the right DLPFC, Brooks et al., 2011).
A similar but weaker decrease in Z-scores was observed in the gray matter on average.
We found that the largest average T score values of gray matter decrease were found in temporal and occipital lobes in the group of people with AN.
The semiquantitative F-FDG uptake values measured by maximum SUV (SUVmax) are reported to be 14 22 in PCNSL [ 15– 18], and this value is about 2.5 times higher than the average SUV in the normal gray matter [ 15– 17] (Table 1).
Mean total cortical gray matter volume was 158 (± 26.6) ml.
An immediate question arises with such an approach: given that cortical gray matter is on average 70 % filled with axons and dendrites [16]: is it possible to grow a large number of neurons simultaneously?
45, 46 In particular, lobules V, VI, VIIb, and VIIIa have reciprocal connections with frontal motor areas, whereas portions of lobule VI and the entirety of crus 1 and crus 2 (subdivisions of lobule VII that make up an average of 40% of total cerebellar gray matter in humans 37) have connections with the prefrontal cortex.
To standardize the individual solutions, the current estimates of each subject and the grand average source constellations were projected on the 1231 possible source loci of a triangularized gray matter surface of an averaged brain (Uutela et al. 1999).
