On arriving at the Bitter Lab in 1969, Cohen designed and built a five-layer shielded room in which he could search for the tiny magnetic signals that were predicted to emanate from the human body. Taking advantage of the then-recently developed superconducting quantum interference device (SQUID), whose sensitivity far exceeded that of previous detectors, Cohen was able to record magnetic signals from both the heart and the brain. The latter results were reported in a landmark 1972 paper in Science that launched the field of MEG.
To commemorate the 40th anniversary of this work, and to mark the opening of a new MEG lab at MIT, Cohen was invited to give a talk at the McGovern Institute's annual symposium, which featured MEG and its applications to cognitive neuroscience. Cohen's lecture can be viewed on the McGovern Institute website, along with other talks from the symposium, held on April 27.