Figure 1.

Edited magnetic resonance spectroscopy of GABA (γ-aminobutyric acid). A, Location of the measurement voxel centered on the hand knob in primary motor cortex (as seen in the axial image). B, Typical edited GABA spectra from 1 child with attention-deficit/hyperactivity disorder (ADHD) and 1 typically developing (TD) child, showing a well-resolved edited peak at 3 ppm. The coedited peak at 3.75 ppm represents total glutamate plus glutamine.