May 21st was the birthday of two men who invented two electric diagnostic devices that are often confused with each other. The EEG, or electroencephalogram device, was invented by German psychologist Hans Berger to record electrical signals from the brain. The ECG or EKG, otherwise known as electrocardiogram was invented by Dutch physician Willem Einthoven to measure the electrical current given off by heart beats.
Perhaps nobody mixes these two devices up, but I sometimes do. All you have to remember: EEG - brain waves, ECG or EKG - heart beats.
Find out what else occurred on this day in science history.
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Perhaps nobody mixes these two devices up, but I sometimes do. All you have to remember: EEG - brain waves, ECG or EKG - heart beats.
Find out what else occurred on this day in science history.
Follow About.com Chemistry on Facebook or Twitter.
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