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One of the more interesting effects of prolonged trends is that they gradually change what traders are capable of seeing. This has very little to do with intelligence and almost everything to do with adaptation. The longer the market behaves in a particular way, the more the human brain begins filtering information through that experience.
During a persistent uptrend, almost every piece of information starts being interpreted as bullish. Pullbacks become buying opportunities by default, weak economic data is dismissed as temporary, and even failed breakouts are viewed as healthy consolidation. The opposite happens during extended bear markets, where positive developments are quickly ignored because traders have become conditioned to expect lower prices regardless of what changes beneath the surface.



The trend itself becomes a lens rather than just a market condition.
This creates blind spots because evidence that contradicts the dominant narrative becomes progressively harder to recognize. Traders are not deliberately ignoring new information. They simply assign less importance to it because recent experience has taught them that continuation is the most likely outcome.
Ironically, these blind spots become most dangerous near the later stages of mature trends. The market can begin changing character while the majority of participants continue interpreting new information through an outdated framework. By the time perception catches up with reality, the structural transition has often progressed much further than expected.
Good technical analysis requires more than identifying trends.
It requires periodically questioning whether the assumptions created by that trend are still justified.
The market changes gradually.
Our interpretation of it often changes much more slowly.