Recovery from catatonia follows a hierarchical precision order
Saito, H.; Takizawa, Y.; Tateno, A.; Theorell, J.; Arakawa, R.; Tiger, M.
Show abstract
Catatonia offers no principled basis for sequencing interventions when first-line benzodiazepines fail. Electroconvulsive therapy (ECT) is the established next step, but specifies what to escalate to, not what to stabilise first. Here we show that recovery is a constrained progression across five precision domains of hierarchical inference: sensory ({pi}s), policy ({beta}), motivational ({pi}m), and fast and slow volatility precision ({pi}v_fast, {pi}v_slow). In twenty-five consecutive inpatients managed without ECT, an order {pi}s [->] {beta} [->] {pi}m [->] {pi}v_fast [->] {pi}v_slow) held without inversion in every patient. Bush-Francis Catatonia Rating Scale (BFCRS) scores fell from 26.3 {+/-} 5.6 to 2.0 {+/-} 2.4 (p < 0.001), and functional recovery tracked restoration of organized action rather than symptom suppression. The framework predicts, untested in this uniformly remitting cohort, that interventions effective at one stage may destabilise another. Within stated conditions, a single inversion falsifies the ordering.
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