Mickelson, an audiologist in Prince George's for 38 years, lives by what she calls the signal-to-noise ratio. For teachers to be effective, their words have to be about 10 decibels louder than the ambient noise in the room. That is difficult to attain consistently with the unaided human voice, given the resistance to making classrooms as quiet as possible, she said.
But about a decade ago, Mickelson said, research began to show that the microphone and speaker systems would aid the learning of most students, not just those with hearing impairments. Mickelson noticed that in college lecture halls, teachers often had microphones. "So we were doing it for adults but not for children," she said. "It didn't make sense."
Monday, March 31, 2008
Something So Simple.....
From today's Washington Post.