This is a much more specific claim than “middle layers do reasoning.” It’s saying the reasoning cortex is organised into functional circuits: coherent multi-layer units that perform complete cognitive operations. Each circuit is an indivisible processing unit, and the $(i, j)$ sweeps seen in the heatmap is essentially discovering the boundaries of these circuits.
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（图源：长春高新 2021 年年度报告）。新收录的资料是该领域的重要参考
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