April 1961 Issue [Article] The happiest creatures on earth? Download PDF Adjust Share by Ruth Brecher, Edward M. Brecher, Subscribe or log in to continue reading. Tags 20th century Animal models in research Behavior modification Brain stimulation Electric stimulation Human experimentation in psychology Medical ethics More from Ruth Brecher The military’s limited war against segregation Ballard vs. the installment Goliaths These railroad wrecks Adjust Share