Middle ear to sounds of higher frequency, because these are better taken up by the inner ear (which also responds to higher frequencies than those of non-mammals). The malleus, or "hammer", evolved from the articular bone of the lower jaw, and the incus, or "anvil", from the quadrate. In other vertebrates, these bones form the primary jaw joint, but the expansion of the dentary bone in mammals led to the evolution of an entirely new jaw joint, freeing up the old joint to become part of the ear. For a period of time, both jaw joints existed together, one medially and one
EAR (band) plus various members of Spectrum, though it is generally considered a Kember solo project. The collective is one of Kember's several post-Spacemen 3 projects, which also include Spectrum, as well albums released under the Sonic Boom moniker. EAR (band) Experimental Audio Research (commonly shortened to E.A.R. or EAR) is a loose collective of experimental musicians formed around Peter Kember (a.k.a. Sonic Boom), formerly of Spacemen 3. While Spacemen 3 were a relatively traditional rock and roll band with strong experimental leanings, E.A.R. is essentially a free improvisation project, creating instrumental music characterized by lengthy, droning textures and slowly evolving structures.