The reason a countdown changes what counts as enough information

Two groups compare four insurance policies. One has ten minutes, one has ninety seconds. The rushed group examines fewer attributes, reaches a decision sooner and reports the same confidence as the unrushed group. They did not feel they had guessed; they felt they had decided.

What everyone sees

Time pressure is expected to produce worse decisions, and often does. What is unexpected is the stability of confidence. If the rushed group knew they had less evidence, confidence should fall. It does not, which means the shortfall in evidence was not registered as a shortfall.

What is actually happening

Payne, Bettman and Johnson showed that decision makers under time pressure switch strategies: from compensatory comparison across all attributes to non-compensatory filtering on one or two, and they accelerate processing rather than merely truncating it. Ratcliff’s diffusion framework describes this as lowering the evidence boundary — the amount of accumulated evidence required before committing. Critically, the sense of having decided is generated when the boundary is crossed, not by the height of the boundary, so a lower boundary produces the same subjective certainty on less evidence.

Why it stays hidden

The shift hides because sufficiency is not measured against an external standard. The decision maker has no counter showing how many attributes they examined against how many exist. They have only the sensation of arrival, and that sensation is produced by whatever threshold happened to be in force. Lowering the threshold lowers what is needed to feel finished, and feeling finished is all the evidence they get.