Couldn't it also just indicate that you've switched from an easy to a difficult subject? All you're really reading is emotion, which may or may not indicate deception.
Sure. But if you're asking someone where they were at the time of a crime -- e.g. Were you at Nicole Brown Simpson's house yesterday at 7pm? -- and that turns out to be a really difficult question for a person to answer, then maybe that's a signal that something more is going on.
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Couldn't it also just indicate that you've switched from an easy to a difficult subject? All you're really reading is emotion, which may or may not indicate deception.
Sure. But if you're asking someone where they were at the time of a crime -- e.g. Were you at Nicole Brown Simpson's house yesterday at 7pm? -- and that turns out to be a really difficult question for a person to answer, then maybe that's a signal that something more is going on.