Event-related functional magnetic resonance imaging (efMRI) is a form of functional Magnetic Resonance Imaging

Functional magnetic resonance imaging

Functional magnetic resonance imaging or functional MRI is a type of specialized MRI scan used to measure the hemodynamic response related to neural activity in the brain or spinal cord of humans or other animals. It is one of the most recently developed forms of neuroimaging...

 (fMRI) in which a series of fMRI images are time-locked to a stimulus presentation and averaged together over many trials. The relationship of the technique to fMRI is analogous to the relationship between Event-related potential

Event-related potential

An event-related potential is any measured brain response that is directly the result of a thought or perception. More formally, it is any stereotyped electrophysiological response to an internal or external stimulus....

 (ERP) data and Electroencephalogram (EEG) data.

Applications

Some have suggested using this technique in conjunction with ERP measurements to localize the structural origins of an ERP wave.