Nudge Wiki

Concept

Information Gap (Curiosity Gap)

Also known as: Curiosity Gap

curiosity attention copywriting

Coined by neuroeconomist George Loewenstein: when there's a gap between what someone knows and what they want to know, they'll take action to close it. Nancy Harhut frames this as one of the most reliable tools for driving action in marketing — pointing out that the audience is missing something they'd like to know, without immediately revealing it.

A dental-insurance trade-show booth applied this directly: rather than lead with product benefits, the campaign asked attendees to "Find Your 5-7" (the recommended years of income a dentist should keep in reserve), intriguing visitors enough to stop and take a quiz before any sales pitch began (see Find Your 5-7 Information Gap Case). Phill Agnew's own test replaced a plain, fully-informative email subject line ("Jose Mourinho: do mind games really work?") with a partially-withheld one ("Jose Mourinho on Nudge...?"), producing a 7% higher open rate and 41% more listens (see Nudge Podcast Mourinho Information Gap Test).

The mechanism goes back further than marketing. Will Storr cites researcher George Loewenstein's own classic demonstration: participants clicking boxes on a grid to reveal an image either saw each click complete a whole animal (control) or reveal only a fragment of one (curiosity condition) — those seeing fragments kept clicking well past the required minimum to resolve the ambiguity, while the control group stopped as soon as the task's minimum was met (see Loewenstein Grid-Squares Curiosity Study). Storr connects this to why Shakespeare's plays broke from convention by deliberately withholding character backstory that earlier versions of the same stories had spelled out in full — the gap itself, not the missing information's content, is what holds attention (see Shakespeare Character-Information-Withholding Case).

A closely related finding: leaving something about yourself unknown can make you more attractive to others, not less. In a study cited in Cialdini's Persuasion, men who withheld their rating of a woman's attractiveness (rather than disclosing it) were far more likely to be chosen for a date than men who revealed a positive rating upfront (see Withheld-Rating Attractiveness Study).

Apple's 1984 Super Bowl ad as a curiosity-gap masterclass (Episode 217). The ad never showed the Macintosh, named Apple, or gave a price — just an Orwellian dystopia interrupted by a hammer-throwing runner and the line "you'll see why 1984 won't be like 1984." Apple's own leadership hated it and tried to pull it from airing; Steve Jobs secretly kept the ad slots anyway. It's credited with $3.5 million in Macintosh sales in the days after it aired and is widely regarded as one of the greatest ads ever made, precisely because it withheld what Apple was building rather than explaining it (see Apple 1984 Super Bowl Ad Curiosity-Gap Case).

A live on-the-spot ad test (Episode 242). Louis Grenier, given one hour to design a memorable coffee ad, built it entirely around curiosity: Kopi Luwak ("civet poop coffee"), with a header reading "you won't believe where this coffee comes from," an image of the civet staring at the camera, and the caption "no shit," rather than the taste- and luxury-focused copy typical of the category. Tested against a conventional control ad via a 30-person VoxPopMe recall survey, the curiosity-driven ad was recalled by far more participants on every measured element (17/30 recalled the image vs. essentially none for the control's product photo, 10/30 recalled "no shit" vs. 2/30 for the control's slogan) — see Nudge Podcast Kopi Luwak Curiosity Ad Recall Test.

KFC's 80-year secret-recipe theater (Episode 275). Richard Shotton argues the actual "11 herbs and spices" recipe barely matters — McDonald's shared its Big Mac sauce recipe publicly in 2017 to near-total indifference — and that the value is in the unresolved gap itself, which keeps the brand front of mind in a way revealing the recipe would extinguish within a week (see KFC Secret-Recipe Information-Gap Case).

Tinder, product-packaging, and a TikTok growth test (Episode 102). Tinder's blurred-match feature converts roughly 8% of free users to a paid subscription purely to reveal already-interested matches (see Tinder Blurred-Match Curiosity-Gap Case); Pringles' "WTF" flavor-withholding tubes and Mattel's Color Reveal Barbie apply the same mechanism to physical packaging (see Pringles WTF and Barbie Color Reveal Curiosity Cases); and Phill Agnew's own TikTok test found curiosity-gap video openers made viewers 82% more likely to follow his account than plain-statement openers (see Nudge Podcast TikTok Curiosity-Gap Test).

Stripping information from a story's opening, not just a marketing message (Episode 279). J.K. Rowling rewrote Harry Potter's opening chapter roughly 15 times, each version discarding more plot information than the last — publisher Barry Cunningham knew the manuscript was good within two or three chapters, plausibly hooked by exactly this deliberate curiosity (see Harry Potter First-Chapter Curiosity-Rewrite Case).

MrBeast packs curiosity into a video's first five seconds (Episode 114), though Phill Agnew notes this alone isn't distinctive since most successful video creators already do it.

Discussed in

  • Episode 102 — I used an ancient storytelling trick to get 11k TikTok followers (Tinder, Pringles/Barbie, TikTok growth test)
  • Episode 114 — MrBeast- How to capture the attention of billions (first-five-seconds hook)
  • Episode 121 — 121-i-tested-5-more-marketing-principles-to-see-if-they-really-worked
  • Episode 123 — 123-the-surprisingly-simple-way-to-change-someone-s-mind (Loewenstein's original study; Shakespeare)
  • Episode 217 — 217-every-trick-steve-jobs-used-to-persuade-in-68-minutes (Apple's 1984 Super Bowl ad)
  • Episode 233 — 233-will-tips-from-a-102-year-old-marketing-book-work-in-2025 (Claude Hopkins's curiosity-slogan advice; Pick and Sweeney's Heineken study)
  • Episode 213 — 213-i-watched-300-tv-ads-here-s-how-they-nudge-you (Teasing Effect study)
  • Episode 242 — 242-i-tested-this-marketing-guru-s-advice-was-it-a-waste-of-time (Kopi Luwak ad recall test)
  • Episode 243 — 243-instagram-failed-until-it-made-this-simple-change (World's Deepest Bin; "this"-word headline tests, as one of Bas Wouters's four "stopping power" principles)
  • Episode 275 — 275-the-secret-behind-kfc-s-success (KFC's secret-recipe theater)
  • Episode 279 — 279-the-psych-trick-behind-one-of-the-decade-s-fastest-growing-orgs (Harry Potter first-chapter rewrite case)

Related