Electroencephalography (EEG) is the recording of electrical signals from the brain via placement of an array of electrodes on the scalp. EEG can be recorded with millisecond-precise time resolution that is not possible with fMRI. In the PNRC, we combine EEG with fMRI to take advantage of the excellent temporal and spatial resolution of EEG and MRI, respectively. MRI-compatible EEG recording is used to determine the timing of EEG events and then these can be localized in the brain using the corresponding fMRI response.
Magnetoencephalography (MEG) uses sensitive superconducting detector coils to non-invasively record the magnetic signals of brain cell communications with millisecond time resolution. The magnetometer does not produce any magnetic fields or electrical currents, it only passively listens to the magnetic fields produced spontaneously in a person's brain. This recording occurs in a manner similar to how EKG and EEG listen to electrical currents produced by a person's heart and brain.
Diffusion Tensor Imaging (DTI), is an application of diffusion imaging where several sets of diffusion-weighted images are acquired with the diffusion gradients applied in different directions. This technique enables the detection of diffusion anisotropy in various mediums such as brain white matter.