A lot of our understanding of these oscillations come from non invasive methods in humans like electroencephalography (EEG), magnetoencephalography (MEG) and invasive methods in animal models. However, EEG and MEG measure oscillations that are generated by collective firing of large cortical patches thereby losing spatial resolution. Also activity from deeper structures like amygdala and hippocampus cannot be picked up in these modalities. Animal models often suffer from the poor translation of behavior from animals to humans and vice versa. Intracranial EEG or Electrocorticography (ECoG) helps overcome the drawbacks described above.