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. The stereotactical phenomena can explain common posttraumatic neurological signs and cerebral lesions. Further experimental and especially human observational research in TBI biomechanics is needed.