Neat News 703 (added 2017-12-03)
Influencing Brain Activity by Ultrasound

Public Domain by Johannes Sobotta
In experiments with macaque monkeys it has been shown that focused ultrasound can be used to draw the attention to an object tracked by one hemisphere of the brain rather than another. As a consequence, there is hope that ultrasound might offer a mild non-invasive approach to treating conditions in the brain such as depression.