In once recent paper , Dr. Itzhak Fried , a neurosurgeon at the University of California , Los Angeles , and Dr. Christof Koch , a neuroscientist at the California Institute of Technology , reported that a single cell in the hippocampus of a patient being prepared for epilepsy surgery fired vigorously and consistently in response to a picture of the actress Jennifer Aniston , but far less so when the patient looked at other photographs .