Glossary Terms  Home

G

Gaussian Random Fields

A branch of mathematics that deals with the properties of smooth, spatially extended data.  Application of random field theory to fMRI data can help ameliorate the multiple comparisons problem.

General Linear Model (GLM)

A class of statistical tests that assume that the experimental data are composed of the linear combination of different model factors, along with uncorrelated noise.

Glass-brain view

A two-dimensional projection of fMRI data, as if the brain were made transparent and only the activation were visible. 

Gradient Coils

Electromagnetic coils that create controlled spatial variation in the strength of the magnetic field.

Gyromagnetic Ratio

The ratio between the charge and mass of a spin. The gyromagnetic ratio is a constant for a given type of nucleus.