[I can hear you, but I don't understand you. Why is it so important to perceive high frequencies?].

The word personality is derived from the Latin word "persona" (mask, person); "per sona" means "by the sound or through the sound". In order to look through speech, to hear "behind the mask of a person", we have to be able to hear properly. Especially the frequencies between 2 kHz and 5 kHz and the overtones (the higher we can perceive them, the better) play a central role for decoding vowels, consonants and effects of emotions in voice and speech; beyond that they provide the perfect enjoyment of music and sound. Obviously they are also a vital physical necessity. High frequencies stimulate, they provoke attentiveness and concentration. The activity level of the reticular formation is affected by the influent of the sensory organs with a crucial role by the hearing sense. Hearing in high frequencies leads to higher metabolism, to better motility, to an activation of the gamma nervous system and to a better transfer of information.