Section 08 / 08

Myths to Unlearn

Public speaking attracts zombie facts: claims that sound scientific, get repeated in a thousand trainings, and refuse to die. Here are the big ones, and what the evidence actually says.

1. 01

   “93% of communication is nonverbal”

   The famous 7–38–55 split comes from 1960s experiments on single spoken words where tone and meaning deliberately conflicted, which is nothing like a speech. Mehrabian himself has spent decades asking people to stop generalizing it. Words carry your content; delivery shapes how it lands. Neither is 93% of anything.

   Albert Mehrabian, on the misuse of his own 1967 studies

2. 02

   “Do a power pose before you go on”

   The 2010 study behind power posing failed to replicate in larger follow-ups, and one of its own authors publicly disavowed the effect. Standing tall is fine, since posture affects how the audience sees you, but two minutes in a Wonder Woman stance won't change your hormones or your outcome. Preparation and repeated exposure will.

   Replication studies, 2015–2017 · co-author Dana Carney's retraction

3. 03

   “Imagine the audience naked”

   No evidence supports it, and the logic is backwards: it frames the audience as a threat to be diminished, when connection is what actually dissolves speaking fear. See them as allies who want you to succeed, because overwhelmingly they do. Then make real eye contact instead of imagining anything.

4. 04

   “Great speakers are born, not made”

   Speaking is a trainable motor-and-language skill, and it responds to deliberate practice like any other: feedback, repetition, and graded challenge produce measurable improvement. The polished keynote speaker you admire has simply logged reps you didn't see. The fixed-talent story survives because it excuses not practicing.

5. 05

   “Eliminate every um”

   A modest rate of fillers is normal human speech. Spontaneous conversation is full of them, and chasing absolute zero makes speakers stiff and self-monitoring. The real problems are clusters: fillers at every pause, or in place of every transition. Reduce them by pausing instead; don't try to eradicate them.

6. 06

   “A strong speech hides behind a strong slide deck”

   Slides are the most common way speakers avoid rehearsing: the deck becomes a teleprompter and the talk becomes a read-along. Audiences came for a speaker, not a document. Build the talk first, out loud; add slides only where a picture or chart does what your voice can't.