Cazard P, Thioly F, Blanchard-Rémond A
Rev Electroencephalogr Neurophysiol Clin. 1979 Oct-Dec;9(4):340-7. doi: 10.1016/s0370-4475(79)80018-0.
Research was carried out on twenty subjects on the volontary control of alpha rythm by retroaction. Retroaction was provided in real time as a sound indicating the presence of alpha bursts or the intervals between bursts when reaching a pre-selected amplitude threshold, in such a way as to ensure that the alpha Index of the control situation (LB) reached about 50% of its total length. There are five situations per session: the initial state or base line (LB), relaxation with eyes closed (DF) and eyes open (DO), concentration with eyes closed (CF)and eyes open (CO), each situation being subdivided into 4 one-minute sequences. Subjects are informed about the alpha Index achieved at the end of each sequence, thus creating a periodic reinforcement. From the outset, three subjects showed an evident ability to increase or decrease at will the alpha occurrence rate, which gradually improved as the sequences progressed. Three other subjects showed that the same ability but to a lesser extent. Subjects confirmed that the feedback signal helped them to determine the most effective strategy for voluntary control, thus indicating that training is possible and that it is greatly facilitated by feedback, at least in the early stages. A detailed analysis of the recordings has made it possible for us to formulate hypotheses about the most important aspects of this control.
对20名受试者进行了关于通过反馈进行α节律自主控制的研究。实时提供反馈，以声音表示当达到预先选定的幅度阈值时α波爆发的存在或爆发之间的间隔，以确保对照情况（LB）的α指数达到其总时长的约50%。每次实验有五种情况：初始状态或基线（LB）、闭眼放松（DF）和睁眼放松（DO）、闭眼集中注意力（CF）和睁眼集中注意力（CO），每种情况再细分为4个一分钟的序列。告知受试者每个序列结束时达到的α指数，从而形成周期性强化。从一开始，三名受试者就表现出明显的能力，可以随意增加或降低α波出现率，并且随着序列的推进，这种能力逐渐提高。另外三名受试者也表现出同样的能力，但程度较轻。受试者证实，反馈信号帮助他们确定自主控制的最有效策略，这表明训练是可行的，并且至少在早期阶段，反馈极大地促进了训练。对记录的详细分析使我们能够就这种控制的最重要方面提出假设。
