SAN FRANCISCO (Reuters) - Karrie Karahalios can show a child with Asperger's Syndrome when he's lost in a conversational riff or a taciturn spouse when he doesn't speak very much.
Their voice appears on a computer terminal as vibrant colors -- red, yellow, blue, green -- the image growing in size if the voice gets louder, overlapping another color as it interrupts or abruptly narrowing with silence.
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