No. #163

Suffix Effect
- Impairment of Recall by a Final Item

The suffix effect is a phenomenon where the recall of the final items in a list is impaired by a subsequent, irrelevant item (the 'suffix'). This can impact the effectiveness of auditory information delivery, such as in voice-assisted interfaces, instructions, or any scenario where a series of items or instructions are conveyed verbally.

Read more on Wikipedia

Product example

In a voice navigation system, an irrelevant sound or announcement following a list of directions could impair users’ recall of the last directions given, affecting their ability to navigate effectively.

Empathy tips

1

Design Against Suffix Interference

Carefully design information delivery to avoid suffix interference, particularly in auditory formats.

2

Control Auditory Sequence

Control the sequence and timing of auditory information to minimize the impact of any irrelevant concluding items.

3

Enhance Last-item Recall

Implement strategies to enhance recall of the last items, such as repetition or emphasizing their importance.

4

Feedback on Information Retention

Gather user feedback on information retention to identify and mitigate potential suffix effects.

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Anna Lundqvist
UX & AI ethics expert driving better products and smarter teams.
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Eddy Salzmann
Design lead crafting seamless products and mentoring design teams.