Dilatation

The dilation effect refers to the feeling of the emitter concerning the space of propagation and the hearing sensitivity of others: the emitter feels that the sound she or he produces will carry and be clearly perceived (diastolic movement). This effect can be anticipatory as well as perceptual. Human ethology is swarming with representative cases of this preventive sound marking: for instance, a person who is not accustomed to using a telephone and speaks loudly as the correspondent is far away.