Cochlea a protein motor called prestin on their outer membranes; it generates additional movement that couples back to the fluid–membrane wave. This "active amplifier" is essential in the ear's ability to amplify weak sounds. The active amplifier also leads to the phenomenon of soundwave vibrations being emitted from the cochlea back into the ear canal through the middle ear (otoacoustic emissions). Otoacoustic emissions are due to a wave exiting the cochlea via the oval window, and propagating back through the middle ear to the eardrum, and out the ear canal, where it can be picked up by a microphone. Otoacoustic emissions
Jock Stirrup – Iraq. Stirrup strongly backed Mohan's plan but noted that Mohan would need to be pressed hard to deliver and also supported with Corps forces. Austin was reluctant to provide support, wishing to focus on Mosul, but Petraeus agreed with Stirrup. However, this plan was overtaken by Maliki's decision to launch Operation Charge of the Knights. Both Stirrup and the American commanders were taken by surprise and were concerned about the lack of planning but Maliki was determined to launch his operation in late March. Operation Charge of the Knights led to the Battle of Basra which lasted from 25