>He met a woman in her 90s who would sometimes slip into a reverie, her hands moving constantly. According to her daughter, she was thinking in Sign. It sounds

>He met a woman in her 90s who would sometimes slip into a reverie, her hands moving constantly. According to her daughter, she was thinking in Sign. It sounds to me like she was thinking out loud, or 'talking' to herself. Thinking would correspond to imagining her hands moving, presumably in far more detail then the rest of us can render internally. Except perhaps for some master craftspeople who use their hands professionally. For example, a few pianists can learn a piece from reading the score alone, away from the keyboard.