Assessing why the testing effect is moderated by experimental design.

Area of Science:

• Cognitive Psychology
• Experimental Psychology

Background:

• The testing effect enhances memory recall.
• Experimental design influences the magnitude of the testing effect, with mixed-list designs yielding larger effects than pure-list designs.

Purpose of the Study:

• To investigate the underlying mechanisms responsible for the design moderation of the testing effect.
• To contrast three theoretical accounts: item-order, retrieval-distinctiveness, and rehearsal-borrowing.

Main Methods:

• Three experiments were conducted to differentiate between the proposed theoretical accounts.
• Participants' free recall performance was assessed under mixed-list and pure-list conditions.

Main Results:

• The testing effect was consistently larger in the mixed-list condition than in the pure-list condition, confirming the design-moderation pattern.
• Results provided support for the rehearsal-borrowing account.
• No evidence was found to support the item-order or retrieval-distinctiveness accounts.

Conclusions:

• The rehearsal-borrowing mechanism adequately explains why the testing effect is larger in mixed-list designs.
• The findings underscore the importance of experimental design in memory research and contribute to understanding memory retrieval processes.