The researchers divided the subjects into two groups: group A did its own thing for ten minutes, but did not do anything that would lead to lying  group B was asked to steal the test paper and lie during the test  The researchers then asked the subjects to wear special electrodes to record the frequency of blinking when asked  The results showed that the blinking frequency of group A increased slightly, but the blinking frequency of group B decreased at first, and then increased significantly to 8 times of the general frequency
Thus it can be seen that by observing the blinking frequency of a person, we can judge whether he is lying or not
The subjects in group B were instructed to tell lies rather than to tell lies themselves, so is the correlation between lying and blinking reliable.