[Deutsch] Die 85%-Regel

# The 85% Rule: Why Getting Everything Right (Or Wrong) Kills Learning [German content summary] Psychologist Robert Björk's research shows learning is optimized at 85% accuracy. Material learned at this level is retained 50-70% longer than material learned at 95%. Too easy (95%) and the brain ignores it. Too hard (55%) and frustration kills engagement. At 85%, the brain experiences "desirable difficulty" — challenging but achievable. Neuroimaging shows the prefrontal cortex (learning center) is fully engaged at 85%, activating dopamine during errors. Amal's HLR adaptive system continuously monitors accuracy and adjusts difficulty to keep each child in this optimal zone.