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
Who Are You (Buffy the Vampire Slayer) Who Are You (Buffy the Vampire Slayer) "Who Are You" is the 16th episode of season 4 of the television show "Buffy the Vampire Slayer". Written and directed by series creator Joss Whedon, it originally aired February 29, 2000 on the WB Television Network. Buffy, in Faith's body, is abducted by the Watchers Council's team. Meanwhile Faith, in Buffy's body, gives herself a makeover and heads to The Bronze, where she has ruthless fun at the expense of Spike and Tara. Tara recognizes that something is wrong, and she and Willow perform a spell to find the real Buffy. Faith