How frequently should master educators vary the stimuli during a lesson?

Varying stimuli during a lesson is crucial in maintaining student engagement and enhancing learning. The frequency of every 20 minutes is supported by educational research which suggests that the average attention span for adult learners is about 20 minutes. By introducing new stimuli or changing activities at this interval, educators can help prevent monotony and keep students actively involved in the lesson. This could include changing the teaching method, introducing a new topic, or integrating interactive elements like discussions or hands-on practices.

This approach encourages better retention of information, as students are less likely to disengage if they experience variety and engagement throughout the lesson. It helps cater to different learning styles and keeps the classroom dynamic, which can be particularly beneficial in a field like esthetics, where practical application and visual learning are essential.