I think the image was mischaracterised. The fMRI will show changes in activity and if the image is actually from an fMRI post meditation then the authour may ha

I think the image was mischaracterised. The fMRI will show changes in activity and if the image is actually from an fMRI post meditation then the authour may have just extrapolated from 'reduction in beta waves' to 'less activity on this colour gradient image'. Perhaps the authour isn't really that familiar with the material?