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Polysomnography: Understanding this technology?s past might guide future developments.

机译：多导睡眠监测仪：了解这项技术的过去可能会指导未来的发展。

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摘要

Hans Berger published the first human electroencephalograph (EEG) recording in 1924 [1]. He used a device called the string galvanometer to record brain waves on a light-sensitive plate. The fluctuating potential difference from the scalp oscillated at eight to 13 cycles per second (alpha rhythm) when an individual closed his or her eyes and remained relaxed but awake. Berger noted that when a person fell asleep, the alpha rhythm disappeared. Amazingly, to this day, the alpha rhythm disappearance remains the primary marker for defining sleep onset. Years later, Carl Ludwig invented a kymograph (the ?wave writer?) that used a stylus to record electroencephalographic oscillation on a rotating drum. Later, an alternative approach evolved so that the brain wave recordings were inked onto a roll or fan-folded continuous paper strip moving at a constant speed. Mechanical engineers gradually improved the drive mechanisms for moving paper by using rotating sprockets, pinch rollers, and pressure plates. Gear mechanisms were also incorporated to permit speed changes.
机译：汉斯·伯杰（Hans Berger）于1924年发表了第一张人类脑电图（EEG）记录[1]。他使用了一种称为“串振计”的装置，将光波记录在一块感光板上。当一个人闭上眼睛并保持放松但清醒时，头皮的波动电位差以每秒8到13个周期（阿尔法节奏）振荡。 Berger指出，当一个人入睡时，阿尔法节律消失了。令人惊讶的是，直到今天，阿尔法节律消失仍然是​​定义睡眠发作的主要标志。多年后，卡尔·路德维希（Carl Ludwig）发明了一种运动记录仪（“波记录器”），该记录仪使用手写笔在旋转的鼓上记录脑电图振动。后来，出现了另一种方法，使脑波记录着墨到以恒定速度移动的卷或扇形折叠连续纸条上。机械工程师通过使用旋转链轮，压紧辊和压板逐步改善了用于移动纸张的驱动机制。还集成了齿轮机构以允许变速。

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