The heads of the animals were located on the centerline of the horn at a distance of 5-30 cm. In most experiments, the animal was placed in the prone position facing the horn. When a large artefact was detected, the animal was moved farther away or to a perpendicular position.
The data indicate that pulsedmicrowaves induce acoustic pressure waves in the brain. Hydrophone output waveforms and analysed spectra show that fundamental and second harmonics were nearly identical to those predicted by the thermoelastic theory (thermoelastic expansion).
