Functional magnetic resonance imaging (fMRI) and concurrent measurement of extracellular field potentials in the rat monitor neuronal activities in individual hippocampal subfields as well as resultant changes in brain wide neuronal network. This experimental approach provides insights into the neurophysiological basis of fMRI and provides conclusions how altered neuronal activities in individual hippocampal subregions controls the function of the hippocampal formation as well as global neuronal circuits.
