Ma Xuelun (PhD, Department of Microbiology, The Chinese University of Hong Kong) Photo: RTHK "Laughing" and "crying" are both innate and effective ways to express emotions and needs to adults before we even know how to speak. Babies cry when they are hungry and laugh when they are amused. We have long been accustomed to it, but scientists' research has found that the physiological mechanisms of "laughing" and "crying" are completely different. Laughing_7 "Laughing" and "crying" are both important parts of human daily life and have attracted the attention of many scientists. Babies 'train' parents by crying Human "crying" includes crying and tears, both of which have attracted scientists to study.
There are more than one types of human tears, some are secreted daily to moisten the surface of the eyeball, some are stimulated by photo background removing chemical substances (such as cutting onions), and there are tears shed when "crying". Some scientists have studied whether adults feel "good" on the whole after "crying", and found that the answer is not one-sided. Fifty percent of people feel "good", but 10 percent of people feel "good". Feeling "poor", it can be seen that "crying" may be affected by other factors in addition to expressing emotions. Laughing_3 Some scientists use delicate thermal imaging cameras to study the subtle changes in human crying.
As for the cries, the most noticeable is the cries of children, especially those who have not yet learned to speak. Many adults, especially mothers, will say that the crying of their children makes them unable to calm down, and they will want to appease them as soon as possible, hoping that they will stop crying. Some scientists designed an experiment for this, allowing the mother to sit in front of a computer to take a concentration test and conduct a brain scan for her at the same time. When the scientists played the babies' laughter, the mothers' concentration was unaffected, but when the babies' cries were played, the mothers had difficulty concentrating. Scientists believe that this is the result of evolu