In older experiments Gurdjian noted significant differences between the DAI localisation after head impacts on primates and dogs. These differences are unexplained by the current biomechanical theories, but they can be easily understood according to the stereotactical approach by the difference between the shape of the animals' skull vaults and their geometrical centre localisation. According to the stereotactical approach, the DAI is concentrated in the geometrical centre of the skull vault and, as the primates' skull vault is more incurved, their geometrical centre is placed higher than the dogs' one. The total irradiation doze, aimed to destroy the deep lesion, is spatially fractionated in many convergent beams. Thus, the superficial structures receive only small fractions of the total irradiation doze and are preserved.
Sounds are also pressure waves.
Microphones with parabolic reflective surfaces and the concert halls' architecture use the stereotactical principle in acoustic applications. In order to observe the consequences of the stereotactical summation phenomena on a simple mechanical model, a rigid hemispherical plastic bowel filed with water is briefly impacted with a tough object. They are visible on the water surface and their propagation and amplitude can easily be observed. They propagate concentrically towards the centre of the bowel and their amplitude progressively increases. This proves that the pressure gradient that causes them increases also and is maximal in the geometrical centre of the bowel.