Speeding lectures to make time for retrieval practice: Can we improve the efficiency of interpolated testing?

Area of Science:

• Educational Psychology
• Cognitive Science
• Learning Sciences

Background:

• Interpolated testing, where tests are interspersed within lectures, is a recognized learning enhancement tool.
• While effective for improving test performance and reducing mind wandering, interpolated testing increases overall instructional time.

Purpose of the Study:

• To investigate strategies for mitigating the increased instructional time associated with interpolated testing in recorded lectures.
• To examine the interaction between increasing recorded lecture playback speed and the effectiveness of interpolated testing.

Main Methods:

• Recorded lectures were presented at normal speed and at 1.5x playback speed.
• Interpolated tests were incorporated into the lectures to assess their impact.
• The study analyzed the combined effects of increased playback speed and interpolated testing on learning outcomes.

Main Results:

• The benefits of interpolated testing were found to be robust across different lecture playback speeds.
• The positive effects of interpolated testing were observed to be largely additive, even when lectures were sped up.
• Increasing playback speed did not negate the learning advantages provided by interspersed testing.

Conclusions:

• Combining increased playback speed with interpolated testing offers an efficient method for enhancing learning from recorded lectures.
• Educational interventions can be optimized to balance learning gains with instructional time constraints.
• The findings support the use of accelerated playback and interpolated testing as complementary strategies in distance education.