You see a headline: "You won't believe what happened next..." but the article requires you to click to see the ending. The gap between what you know (something happened) and what you want to know (what it was) creates psychological discomfort that motivates you to close the gap.
Loewenstein (1994) formalized this as information gap theory.1 Curiosity is not random—it's triggered by specific gaps between what you know and what you want to know. The larger the gap, the stronger the motivation to close it.
Information gap is the discrepancy between what someone knows and what they want to know, and that discrepancy creates curiosity-driven motivation to seek information.
The mechanism is psychological discomfort: your brain experiences a gap between current knowledge and desired knowledge as an itch. The itch motivates seeking behavior. Close the gap (gain the information), and the itch disappears.
KFC weaponizes this with their secret recipe strategy: the formula is secret, which creates a gap ("what's in it?") that makes customers curious. The gap is maintained (never fully revealed) to sustain curiosity indefinitely.
Information gaps create what's called "deprivation motivation": the absence of desired information motivates seeking. Your brain is configured to notice gaps and push toward closing them.
This works across domains: mystery boxes create gaps (what's inside?), cliffhangers create gaps (what happens next?), redacted information creates gaps (what's hidden?). All leverage the same mechanism: gap triggers curiosity triggers seeking.
Loewenstein's research showed that people will click on hidden information more frequently than on fully visible information, even when the information is identical. The gap itself (not the information value) drives the motivation.
Information gaps pair with scarcity for maximum effect. A secret recipe is interesting because it's secret (gap) AND rare (scarcity). If the recipe were just hidden but easily accessible elsewhere, the gap wouldn't matter. Scarcity makes the gap more acute.
Similarly, time-limited information ("available for 24 hours only") creates both gap (what's in it?) and scarcity (limited time to access). The combination is more motivating than either alone.
Step 1: Identify information your audience wants to know What questions do customers have about your product? What would they be curious about?
Step 2: Create deliberate gaps in information availability Don't answer every question upfront. Reveal some information, withhold other information strategically. The gap creates curiosity.
Step 3: Make the gap visible The gap only works if customers notice it. Hidden information they don't know exists doesn't create curiosity. Make them aware there's information they're missing.
Step 4: Control the closure point You decide when/how the gap gets closed. KFC never fully closes their recipe gap. Some brands close it immediately (generate curiosity, then satisfy it instantly). Others maintain the gap indefinitely (keep curiosity alive).
Step 5: Create new gaps continuously Once you close one gap, customers' curiosity is satisfied. Create new gaps to maintain engagement. Product teasers, sneak peeks, behind-the-scenes content—all create new information gaps.
If gaps persist too long without any closure, curiosity converts to frustration. People will give up seeking if the effort to close the gap exceeds the value of the information. The gap needs to feel closeable, just not immediately.
Also, if the gap is closed and reveals nothing interesting, customer satisfaction drops. The information revealed should justify the curiosity.
Behavioral-Mechanics → Incongruity & Humor: Information gaps create incongruity (expected vs. actual information). Incongruity & Humor explains why the gap resolution often involves unexpected information that triggers surprise or humor.
Behavioral-Mechanics → Zeigarnik Effect: Unfinished information (gaps) are remembered better than complete information. Zeigarnik Effect explains why maintaining gaps increases memory of your brand.
Sharpest Implication: You don't need to provide all information about your product—just the right gaps. Strategic information withholding creates curiosity that drives engagement more effectively than information abundance. This means incomplete marketing (teasers, mysteries, secrets) can outperform comprehensive marketing.
Generative Questions: