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Premature urgency drives noradrenaline-modulated decreases in information gathering. A cost-per-step signal reflects an emerging urgency to commit to a decision as sampling progresses. This urgency signal arises nonlinearly, escalating significantly earlier in the noradrenaline group in the fixed (A) and the decreasing (B) condition. The group mean of the urgency signal (±1 SEM) is derived from a sigmoidal model function for subjective costs, which outperformed linear models.
