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Mu waves, also known as mu rhythms, comb or wicket rhythms, arciform rhythms, or sensorimotor rhythms, are synchronized patterns of electrical activity involving large numbers of neurons, probably of the pyramidal type, in the part of the brain that controls voluntary movement. person suppresses mu wave patterns when he or she performs a motor action or, with practice, when he or she visualizes performing a motor action. This suppression is called desynchronization of the wave because EEG wave forms are caused by large numbers of neurons firing in synchrony.
To muffle is to quiet a sound, usually by wrapping it with something. If you try to speak with a scarf over your mouth, your voice will be muffled. When a hitman puts a silencer on a gun, he's muffling the sound of gunshots, since muffling makes things quieter. Usually, muffling involves wrapping something around or putting something over a noisy thing. Muffling dampens, tones down, deadens, and dulls. Also, if you hold down your emotions and don't express them, you're muffling them.