Lutzenberger W, Elbert T, Rockstroh B, Birbaumer N
Biol Psychol. 1982 Feb-Mar;14(1-2):99-111. doi: 10.1016/0301-0511(82)90018-7.
Twenty subjects learned to control slow potential (SP) shifts of the brain by means of a biofeedback procedure. Depending upon the pitch of a signal tone, negative SP shifts had to be increased or reduced during intervals of 6 sec each. Visual feedback of the actual SP shift was given. Blocks of training trials alternated with blocks of test trials without any feedback of the SPs. At the end of every test trial a simple arithmetic problem had to be solved by the subjects. Subjects performed the computation in a shorter time interval if an increased negativity preceded task onset as compared to slower response times during suppression of negativity. Results suggest that cortical negativity reflects unspecific preparation for cerebral performance.
20名受试者通过生物反馈程序学会了控制大脑的慢电位（SP）变化。根据信号音的音高，在每次6秒的间隔内，负向SP变化必须增加或减少。给出了实际SP变化的视觉反馈。训练试验块与测试试验块交替进行，测试试验块没有任何SP反馈。在每次测试试验结束时，受试者必须解决一个简单的算术问题。与负性抑制期间较慢的反应时间相比，如果在任务开始前负性增加，受试者会在更短的时间间隔内完成计算。结果表明，皮质负性反映了大脑活动的非特异性准备。
