Effects of low-intensity ultrasound on the central nervous system of primates.
The brains of anesthesized squirrel monkeys were exposed to 2.25 to 5 MHz ultrasound at low intensities (average power from 3 mW/cm2 to 0.9 W/cm2). The exposure produced evoked potentials recorded by EEG electrodes chronically implanted in the midline parietal region. Computer analysis of the waveforms showed that ultrasound produced a transient upward shift in both the peak frequency and in its amplitude. Complete adaptation occurred with 3 min of continuous exposure to either CW or pulsed irradiation.
D000222:Adaptation, Physiological; D000818:Animals; D001921:Brain / Q000502:physiology*; D004569:Electroencephalography; D004780:Environment, Controlled; D005071:Evoked Potentials; D000882:Haplorhini; D012453:Saimiri; D014465:Ultrasonics