Which term refers to the act of using gestures or body language to emphasize ideas in a speech?

The term that refers to the act of using gestures or body language to emphasize ideas in a speech is nonverbal communication. This encompasses a wide range of physical behaviors, including facial expressions, posture, and gestures, which can enhance the message being conveyed. Nonverbal cues can significantly add to the effectiveness of a speech by reinforcing verbal messages, clarifying content, and helping to engage the audience. For instance, an enthusiastic gesture can highlight a key point or express emotions that words alone may not convey.

In contrast, vocal variety refers to the modulation of voice, including changes in pitch, tone, and volume, which also affects how a message is received but is distinct from physical gestures. Visual aids are tools like slides or props that support the spoken message, while articulation pertains to the clarity of speech and the way words are pronounced. Thus, while all these elements are important in public speaking, the specific act of using gestures and body language is best captured by the term nonverbal communication.