Intraoperative Assessment of Cerebral Activity During Open Heart Surgery William B. Shaffer, Dorothy F. Farrell, Paul G. Barash, Judith M. Gatehouse and Susan W. Iverson J Extra Corpor Technol, 9 3 (1977) 123-128 Published online: 11 October 2023 DOI: 10.1051/ject/197793123