Reveal with the voice

Claim: points appear as they are spoken, not a whole slide at once.

What it asks

  • Show each key point when you reach it, so the eye goes where the voice goes.
  • Animate a change or a step, not decoration (Beamer 2026, convention).
  • Build a figure part by part when you explain its parts.
  • Pause at each step. In a talk, your pauses stand in for the listener's control of pace.

Why

Liu 2022 (n = 99) found that key points shown in step with the narration beat two other formats on the post-test and on efficiency. The two others showed the whole slide at once, or the picture after the narration.

Ito 2026 (n = 40, one biology lesson, abstract) found that a cumulative slide gave higher learning, d = 0.49, and earlier looks at the matching element, d = 1.76.

Limits

  • All three build studies used recorded narration. Whether builds help a live audience is not known.
  • Both studies are small and cover one lesson each. One course found exam scores largely unaffected by animated slides, and animating illustrations may do more than animating text (Miller 2011, abstract).
  • Learner-paced instruction gave better transfer than system-paced, at a large cost in time (Tabbers 2009, abstract). A speaker-paced build is the system-paced arm.
  • Transitions: no study was found. WCAG 2.2.2 (W3C 2023d) wants a way to pause any movement that starts alone, runs past 5 seconds and shares the screen with other content.
  • A whiteboard animation raised ratings and not knowledge, which the authors link to seductive details (Meij 2021, abstract).