Final answer:
Facial expressions are the most accurate predictor of a speaker's true feelings and attitudes.
Step-by-step explanation:
The facial expressions have been called the "windows to the soul" and are considered to be the most accurate predictor of a speaker's true feelings and attitudes. Facial expressions, such as smiling, frowning, and raising eyebrows, can reveal a person's emotions and inner experiences without them having to speak a word. For example, a smile can indicate happiness or amusement, while a furrowed brow can convey confusion or concern.