New research found that brain scans can detect consciousness in some patients with brain injury who are unresponsive. In the study, 241 participants with severe brain injury who do not respond when given a simple instruction were assessed with functional MRI (fMRI), electroencephalography (EEG), or both tests, while hearing instructions, such as 'imagine opening and closing your hand.' Their brain responses showed that 25 percent of participants repeatedly followed this instruction covertly over minutes.