how are age-related changes of the brain measured in different regions of the brain how to compare the function of age and volume comparing volume effects of age in different areas of the brain what is the scale for y, z, and z in an age-dependent brain model? how to compare effects of age on brain how to compare the effects of age across brain regions age vs size of the brain what is the effect of age in the brain how can you compare effects of age and volume age affect on brain volume how to compare effects of age across brain regions how to compare effects of age across regions how to compare the effects of age if the brain volume is different between regions what is the relationship? how should a brain size be determined how do we compare the effects of age on the brain why are some regions larger than others why is it necessary to compare the volume of the brain regions when the regions are of different sizes? how to compare the effect of age across regions what is the difference between age and volume