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<pclass="table-note">Family means are averages over all evaluated category–model cells in that family. Overview tables reflect the archived <strong>DPO</strong> checkpoint; SymMPO evaluation is <ahref="#symmpo-results">pending</a>.</p>
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<pclass="table-note">Family means are averages over all evaluated category–model cells in that family. Overview tables reflect the archived <strong>DPO</strong> checkpoint; SymMPO evaluation is discussed <ahref="#symmpo-results">below</a>.</p>
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<p>
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DPO (archive) shifts HEAS most where base LLaVA under-shoots: <strong>color +0.52</strong>, <strong>motion +0.61</strong>,
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<strong>geometric +0.29</strong>. Angle and impossible were already high pre-DPO; gains are smaller but control
@@ -738,34 +738,51 @@ <h4>SymMPO: why we changed the objective</h4>
<strong>SymMPO</strong> substantially changed the model's outputs (~79% of answers switched vs. base, moving away from "other" toward "correct" and "illusory").
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However, when measured properly — <strong>HEAS over control-passed answers only</strong> — alignment is low (~0.40 overall; undefined for angle, where every control failed).
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On stimuli it understood, SymMPO gives the illusory answer far less often than humans, so it did not acquire human-like illusion susceptibility.
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</p>
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<h4>HEAS — control-gated (only answers where the control passed)</h4>
Once you keep only the answers where SymMPO got the control right, its illusory rate (~13–26%) sits well below the human rate (70–92%), so HEAS is low (~0.40). i.e. on the stimuli it actually understood, SymMPO is largely veridical, not human-illusion-aligned. Angle is undefined — SymMPO failed every angle control, so nothing survives the gate.
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</p>
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<h4>Output change (all stimuli — behavioral, not gated)</h4>
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<ul>
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<li>~79% of answers switched vs base.</li>
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<li>"correct": 0% → 30% (base never picked "they're equal"; SymMPO does ~30% of the time)</li>
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<li>"illusory": 13.5% → 50%</li>
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<li>"other": 86.5% → 20%</li>
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</ul>
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<p>
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SymMPO moved strongly away from "other" toward "correct" and "illusory."
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</p>
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<pclass="table-note">
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Caveat: the 79% switch and the "0% → 30% correct" are upper bounds — base was scored multi-trial (8 draws, argmax) and SymMPO single-trial (1 draw), so some apparent change is an estimator difference, not behavior. (And geometric uses the assumed Müller-Lyer illusory/other correction.)
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length (best cells ≈ 0.92) yet often sit near the floor on color and angle (≈ 0.08–0.14), where humans remain strongly
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illusory. Vision–language models are uneven out of the box; DPO <ahref="#ref-16" class="cite">[16]</a> pushes mean HEAS on evaluated VLM cells to ≈ 0.91,
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especially on color and motion, but control checks and saliency suggest part of that lift may reflect language shortcuts
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as much as visual grounding. SymMPO <ahref="#symmpo-results">still awaits full HEAS evaluation</a>.
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as much as visual grounding. SymMPO <ahref="#symmpo-results">has a low HEAS when controlling for passed answers</a>.
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</p>
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<p>
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These differences line up less with parameter count than with <strong>how representations were learned</strong>. Supervised
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</p>
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<p>
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The fair claim is cautious: under explicit directional metrics, some models align with human error patterns on some
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illusion types, and many do not. Filling the sparse grid, finishing SymMPO benchmarking, and adding rank-based psychometric
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illusion types, and many do not. Filling the sparse grid, and adding rank-based psychometric
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