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I've been tracking sentiment indicators against market moves, and there's a measurable correlation between extreme sentiment shifts and significant market inflection points. When everyone suddenly flips from bearish to bullish (or vice versa) in a short timeframe, it's often a reliable contrary indicator. The data suggests that when AAII bullish sentiment jumps more than 15% in a week, markets tend to underperform over the following month. These aren't just anecdotes – sentiment extremes have predictive value that can be quantified and incorporated into trading strategies.