Tip-of-the-Tongue Phenomenon

Tip-of-the-Tongue Phenomenon

The Tip-of-the-Tongue phenomenon, also called lethologica and often abbreviated as TOT, is a cognitive phenomenon where an individual is unable to recall specific information but has a strong feeling that they know it and can almost remember it. This cognitive bias reflects the intriguing ways our memory works and sometimes, doesn’t.

This phenomenon was first described in The Principles of Psychology by William James way back in 1890. He didn’t actually call it the tip of the tongue phenomenon, though. The term comes from colloquial usage, possibly French.

The “Tip-of-the-Tongue” Phenomenon (TOT) is when you can’t quite remember a word, but you remember some of its features. It can be frustrating and cause mild stress, but you feel relieved when you finally remember the word.

People who experience this phenomenon often recall one or more features of the word, like the first letter, number of syllables, similar-sounding words, and synonyms.

The TOT feeling isn’t just something experienced by English speakers. It’s pretty common across different cultures. In fact, a 1999 study found that 45 out of 51 languages they looked at had their own casual sayings for it, often using the tongue, mouth, or throat as a metaphor. Language is crazy!

This is different from the “feeling of knowing”, which is when you feel like you’ll recognize an item from a list even if you can’t recall it at the moment.


Beyond your traditional app interface, as we start to design more and more conversational UIs that don’t generally have standard navigation, the TOT phenomenon should be considered and accounted for. Make sure to provide a path forward for users who can’t remember a term or navigation item by accounting for natural language and other fallbacks.

UX designers should pay attention to this phenomenon because it can directly impact how a user interacts with our products. When a user can’t quite remember how to complete an action or retrieve information, this can lead to lots of frustration.

In addition, considering the TOT in design decisions aligns with the principles of inclusive design. Some users, like older individuals or people with cognitive impairments, may be more prone to experiencing these moments. By taking this into account we can create experiences that are accessible and enjoyable for a larger group of users.

🎯 Here are some key takeaways:

Be patient and supportive

If users experience the tip-of-the-tongue phenomenon during usability studies or interviews, provide gentle prompts or cues to help them retrieve the information without pressure.

Use clear, familiar language and cues

Whenever possible, use recognizable icons and visual cues to trigger memory retrieval, reducing the cognitive load associated with recalling information from scratch. Avoid jargon or industry-specific terms unless they are commonly known by your users. When in doubt, use clear, simple, and familiar language.

Information Architecture is key

Create a clear and intuitive interface with well-organized menus and labels that make it easier for users to recall specific features or functions without having to search or remember key terms.

Use supportive search functions

When users struggle to remember specific info, a robust search function can be a game changer. Consider features like autocomplete, spell check, predictive text, and personalized search suggestions to make this easier.

Support Natural Language Processing (NLP)

When building conversational UI, make sure your bot can understand and process natural language input. This way, even if users can't remember the exact term or command, the system may still understand what they need.

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