Curiosity has been a focus of psychologists since the dawn of science. American philosopher and psychologist William James proposed that it was a major element of human motivation more than 100 years ago. 

But what is curiosity, exactly?

The two main theories view curiosity either as a feeling of interest (I-type Curiosity) or as a feeling of deprivation (D-type Curiosity). The difference is whether people seek information out of interest (to maintain or enhance positive feelings) or out of frustration of not knowing (to reduce negative feelings). 

New, complex, and unexpected triggers interest us by activating a reward system that generates positive emotions. On the other hand, the “information gap” theory developed by Psychologist George Lowenstein views curiosity as aversive, as a mental itch that must be scratched by making unknown, known

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Studies have even demonstrated that individuals not only seek useless information (e.g results of sports games, celebrities’ sexual history) but even seek unpleasant information (e.g their spouses’ sexual history) that they believe they would be better off without. 

Closely related to curiosity is the concept of anticipation. Whether we are salivating about our dinner plans, excited about planning an upcoming vacation or about to find out who tagged us on Facebook - anticipating future events is a direct source of value. 

Design for curiosity then means intentionally creating intriguing or even mysterious experiences. 

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NOVELTY

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One way to do this is to introduce novelty - something that has not been previously experienced or encountered. While novelty and surprise are connected, and more often than not surprise follows novelty, they are two distinct psychological concepts and thus, belong to two distinct behavioural design strategies.

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Consider the case of Bloombox Club: Its subscribers unbox a surprise plant, either once a month or once a quarter. Not knowing what the plant will be makes it intriguing by building anticipation. In addition to that, each plant is carefully sourced and selected to ensure it's not something that is widely available. This means that when subscribers open their monthly box, it could be the first time they've ever seen the plant.  

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BLURRED INFORMATION

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Another technique involves presenting incomplete information and making people aware that some information is missing. This is often used by experience and user interface designers as a monetisation technique. Linkedin does this by showing you blurred images of users who have viewed your profile.  

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Similarly, Tinder shows you blurred images of users who have shown an interest in you. 

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In both examples, the only way to reveal this hidden information is to become a premium member and close the information gap.

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Recent experiments have also shown how piquing people’s curiosity can influence their choices by steering them away from undesirable choices (like unhealthy foods or taking the elevator) and toward healthier options. 

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ORACLE EFFECT

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Finally, a technique common in games is what is generally referred to as the Oracle effect. Back in ancient times, an oracle was someone who offered advice or a prophecy thought to have come directly from a divine source.

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This technique involves providing a mechanism (and knowledge) to enable people to predict an outcome (e.g actions, events or competitions). People enjoy making predictions.

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Gambling on sports, as well stock markets, is built around the emotional response of successfully predicting the outcome. Knowledge and a trust in our feelings can help us increase the odds of winning. 

Whenever we present information, we have two options. Say everything, or reveal only part of it. Which one will you choose?