Voice modulation during teaching is an example of

Concept

Micro-teaching classifies a teacher's classroom behaviour into distinct skills. The skill of stimulus variation refers to deliberately varying the stimuli reaching learners — through voice, gestures, movement, focus, pause, and interaction pattern — because a constant, unchanging stimulus causes learners' attention to drop over time.

Application

Voice modulation means changing the pitch, tone, speed, and volume of one's speech while teaching. This is one of the specific techniques used to vary stimuli during a lesson, so it falls directly under the skill of stimulus variation.

Contrast

• Skill of introduction concerns how a lesson is opened — linking it to what learners already know and creating interest at the very start — not sustaining attention through the lesson.

• Skill of reinforcement concerns responding to learners' answers and behaviour — praising or correcting responses to strengthen learning — not the teacher's own delivery style.

• Skill of closure concerns how a lesson or topic is summarised and ended, tying the content together — not maintaining attention mid-lesson.

So changing one's voice while teaching is an example of the skill of stimulus variation.