Suggestibility

The tendency to accept and act on suggestions from others. Children are highly suggestible; adults less so, but not immune. Leading questions shape memory — Loftus showed that a single word ("smashed" vs "contacted") shifted speed estimates by 30% and implanted details that never existed. The suggestion created the memory. The memory felt real.

Social proof exploits suggestibility: "9 out of 10 dentists recommend" doesn't add evidence. It suggests that others have already decided. Amazon reviews, Netflix "Trending" — we're suggestible to what others chose. The mechanism: we use others' choices as information when uncertain. The suggestion doesn't need to be dramatic. Small cues move large numbers.

The line between ethical and unethical use is transparency about the suggestion source. Recommendations are ethical — "customers who bought X also bought Y" discloses the mechanism. Manipulation hides it — dark patterns that suggest urgency or scarcity without basis. The same mechanism. Different disclosure.

Gudjonsson's Suggestibility Scale identifies two components: yield (the tendency to accept a leading question's premise) and shift (the tendency to change an answer when challenged). Both operate in business constantly. A CEO who presents a strategy and then asks "Does everyone agree this is the right direction?" is exploiting yield — the question presupposes agreement, and the social context makes acceptance the path of least resistance. A board member who voices a mild concern and then retreats when the CEO pushes back is demonstrating shift — the challenge changed the answer, not the evidence.

One week after Loftus and Palmer's experiment, they asked the same participants: "Did you see any broken glass?" There was no broken glass in the film. But 32% of participants in the "smashed" condition reported seeing it, compared to 14% in the "contacted" condition. The verb didn't just change their estimate. It implanted a detail that never existed. The suggestion created the memory. The memory felt real. The participants were not lying — they genuinely believed they had seen broken glass because the word "smashed" activated a schema that included broken glass, and the schema overwrote the actual observation. This is suggestibility at its most fundamental: an external input reshapes internal experience, and the person cannot distinguish the suggestion from the original.