Reading · Speaking · Thinking Rates
The Presentation Lab · Research Data · n = 254

Your brain reads faster
than your mouth can speak —
and thinking takes the longest.

Participants timed themselves reading, speaking aloud, and speaking while actively thinking through a script excerpt. Here's what the data revealed.

① Fastest 25.7s Silent Reading Eyes scan ahead of any speaker
② Middle 32.9s Speaking Aloud 28% slower than reading
③ Slowest 38.5s Speaking + Thinking 50% slower than reading
Relative speed — same script excerpt Silent Reading
Speaking Aloud
Speaking + Thinking
0s 10s 20s 30s 40s 50s+
Response Distribution — % of 254 participants per time bracket
Reading
Speaking
Thinking
10–19s
22.8%
2.8%
1.2%
20–29s
45.7%
26.0%
8.7%
30–39s
23.2%
56.3%
48.4%
40–49s
5.5%
12.6%
30.7%
50s+
1.2%
2.0%
10.6%
Reading slides is wasteful Audiences read slides 50% faster than presenters can say them. Reading aloud creates a speed mismatch — and a distracted room.
Thinking slows everything down When learners are actively processing ideas, they need more time. Rushing delivery forces them to choose: listen or think.
Pause for thinking speed Effective teaching matches delivery to the thinking rate — the slowest of the three. Pauses aren't silence; they're learning.
Data: McEachern & Associates Consulting Inc. — Presentation Lab participant experiment, 2021–2025 · amlearning.ca