Explain the downstream computation mediating intervention effects

Identify and characterize the downstream computation that converts a residual-stream displacement toward the probe-decoded binding at the validation-selected read layer into a change in the model’s output.

Background

The intervention establishes a causal relationship between displacement toward the probe-decoded binding and improved behavior, but the mechanism by which that displacement affects subsequent computation and the final output remains unresolved. A Jacobian measurement shows that output sensitivity to the binding direction does not decrease on wrong trials, ruling out one possible explanation—that the readout cannot access the binding—without identifying the actual downstream mechanism.

References

The experiments characterize this failure but do not identify its unique training cause. The explicit- and latent-CoT models follow the same training lineage but do not have identical weights, so reasoning mode is not isolated as the sole causal variable. Superposed or unresolved latent representations offer one possible explanation, but the present experiments neither observe nor manipulate parallel reasoning paths. We therefore leave the underlying causal mechanism and transition-aware interventions to future work.

— When Steering Fails in Latent Reasoning: A Latent-to-Language Transition Gap  (2609.21662 - Huang et al., 18 Sep 2026) in Discussion section

We have not resolved the downstream computation that turns a displacement at $\lstar$ into a change of output.

— Legible Failures: Detecting and Repairing In-Context Binding Errors  (2609.11216 - Ravulapalli et al., 10 Sep 2026) in Section 5.2, “Boundary conditions”; reiterated in Section 6, “Discussion and conclusion”