Chinese scientists have found that the wavelength of biophotons (ultra-weak light that cells emit) of animals is shorter than that of humans. Probably, it is this property associated with the transmission and processing of neural signals that explains the high intellectual abilities of Homo sapiens. The discovery is reported in the journal Proceedings of the National Academy of Sciences.
The specific (physical and physiological) properties of the brain that ensure the superiority of the human mind over animals are still a matter of controversy. Neither the size of the brain, nor the coefficient of encephalization could act as an adequate criterion.
In the latest study, Chinese neuroscientists turned to the recently discovered mechanism of communication between neurons - biophotons. They stimulated cells in brain slices with glutamate (a neurotransmitter) and compared the wavelengths of biophotons from different animals. It turned out that as evolutionary "progress" (from bullfrog to mouse, chicken, pig, monkey and man), the wavelength becomes longer. In the brain of Homo sapiens, it reaches the near infrared range (about 865 nanometers).
Scientists suggest that it is this property of the brain that is the biophysical basis of the human mind. The shorter wavelength allows for more efficient and resource-saving communication between neurons.