When a professor stands behind a podium and does not use gestures, he is showing immediacy.
Immediate behaviors are verbal and nonverbal behaviors that reduce physical or perceived physical and psychological distance between communicators, such as smiling, nodding, eye contact, occasional social, polite, or professional behavior. touch, etc.
Nonverbal immediacy includes behaviors such as smiling, gestures, eye contact, and relaxed body language. Verbal immediacy refers to addressing students by name, using humor, and encouraging student input and discussion.
A lectern is a stand that supports a book, notes, or sometimes a microphone. Generally, it means standing behind while delivering a speech or series of statements. You don't have to stand behind the podium during your presentation. Move around the stage from time to time, but make sure the mic is in hand. Keep your notes on the pedestal while you're on the move and refer to them as needed.
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The question is:
When your professor stands in one place behind a podium and does not use any gestures?