It's also worth noting tonal differences between the two. (brainygamer.com)
Merging your top half with a pair of dark navy work pants continues the uniformity of your outfit but brings a a variety of tonal differences. (theidleman.com)
They are picking up speech patterns, tonal differences which help them learn and process language, and they can sense your love and affection for them in your voice. (blog.cloudb.com)