Why do we better remember items at the beginning or end of a list?

The Serial Position Effect

, explained.
Bias

What is the Serial Position Effect?

The serial position effect describes how our memory is affected by the position of information in a sequence. It suggests that we best remember the first and last items in a series and find it hard to remember the middle items.

A graph illustrating the "Serial Position Effect" with a U-shaped curve. The Y-axis is labeled "Amount You Remember," and the X-axis is labeled "Position in Sequence." The curve is higher at the beginning, labeled "Primacy," dips in the middle, labeled "Forgetfulness," and rises again at the end, labeled "Recency."

Where this bias occurs

The serial position effect impacts memory recall most obviously for lists. Imagine that your partner calls you to ask you to pick up some food at the grocery store on your way home. They ask you to get bananas, apples, bread, chicken, white rice, broccoli, and crackers.

When you get to the grocery store, you can’t remember everything that your partner listed. You only recall that they wanted you to get bananas, apples, broccoli, and crackers.

In this scenario, the serial position effect has impacted your memory. You can only think of the first and last couple of items on your partner’s list, but not the items in the middle.

Sources

  1. The Decision Lab. (2020, August 24). Primacy effect. https://thedecisionlab.com/biases/primacy-effect/
  2. Cherry, K. (2020, April 9). What is the Recency Effect? Verywell Mind. https://www.verywellmind.com/the-recency-effect-4685058
  3. McLeod, S. (2017). Multi store model of memory. Simply Psychology. https://www.simplypsychology.org/multi-store.html
  4. Ebbinghaus, H. (1885). Memory; a contribution to experimental psychology. https://archive.org/details/memorycontributi00ebbiuoft/page/vi/mode/2up
  5. Farnam Street. (2018, December 31). The spacing effect: How to improve learning and maximize retention. https://fs.blog/2018/12/spacing-effect/
  6. Yoo, J., & Kaushanskaya, M. (2016). Serial-position effects on a free-recall task in bilinguals. Memory, 24(3), 409-422. https://doi.org/10.1080/09658211.2015.1013557
  7. Wong, E. (2020, August 19). Serial position effect: How to create better user interfaces. The Interaction Design Foundation. Retrieved August 26, 2020, from https://www.interaction-design.org/literature/article/serial-position-effect-how-to-create-better-user-interfaces

About the Authors

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Dan Pilat

Dan is a Co-Founder and Managing Director at The Decision Lab. He is a bestselling author of Intention - a book he wrote with Wiley on the mindful application of behavioral science in organizations. Dan has a background in organizational decision making, with a BComm in Decision & Information Systems from McGill University. He has worked on enterprise-level behavioral architecture at TD Securities and BMO Capital Markets, where he advised management on the implementation of systems processing billions of dollars per week. Driven by an appetite for the latest in technology, Dan created a course on business intelligence and lectured at McGill University, and has applied behavioral science to topics such as augmented and virtual reality.

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Dr. Sekoul Krastev

Sekoul is a Co-Founder and Managing Director at The Decision Lab. He is a bestselling author of Intention - a book he wrote with Wiley on the mindful application of behavioral science in organizations. A decision scientist with a PhD in Decision Neuroscience from McGill University, Sekoul's work has been featured in peer-reviewed journals and has been presented at conferences around the world. Sekoul previously advised management on innovation and engagement strategy at The Boston Consulting Group as well as on online media strategy at Google. He has a deep interest in the applications of behavioral science to new technology and has published on these topics in places such as the Huffington Post and Strategy & Business.

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