The Learning Scientists – Blog

"Blips" Of Knowledge Reduce Accuracy and Increase Confidence

A recent cognitive‑research study examined how varying amounts of medical information affect diagnostic performance. Participants received either no background, a brief symptom sheet, or an extensive open‑book reference. Those with only a short review performed worst and reported the highest confidence, while the open‑book group achieved the best accuracy. The findings highlight a paradox: minimal knowledge can inflate self‑assurance while impairing decision quality.