Four ways a catatonic limb can respond
A 30-year-old man on a psychiatric ward has been largely mute and still for several days. Over one bedside examination, four separate observations are made as the examiner passively moves his limbs in different ways.
This case works through a connected sequence — each part builds on what came before, leading to an integrated picture.
Identify
Observation 1: the examiner raises his arm into an unusual position. It moves with a smooth, even resistance throughout, likened to bending a soft wax rod, and then remains held in that exact position for several minutes without the patient appearing to actively resist. What is this sign?
Correct. The smooth, wax-like resistance during the movement is the specific, defining quality of this sign.
Focus on the quality of resistance felt during the movement itself, described here as smooth and even, like bending soft wax — that specific quality is what names this sign.
Key discriminating feature: The smooth, wax-like resistance quality during the movement itself, combined with sustained holding of the new position afterward, is specific to waxy flexibility.
Identify
Observation 2: the examiner lifts his wrist as if to check his pulse. On release, his arm remains suspended in mid-air for well over a minute, then very slowly sinks back down to his side on its own. What is this sign?
Correct. The slow, spontaneous return to rest after sustained holding is the specific signature of catalepsy.
Focus on what happens after the limb is released and held for over a minute: here it slowly sinks back down on its own, rather than staying fixed indefinitely — that pattern of gradual self-resolution is what names this sign.
Key discriminating feature: Maintenance of a passively-imposed posture for over a minute, ending with a slow, spontaneous sinking back to rest, is specific to catalepsy — the gradual self-resolution afterward is the detail that separates it from waxy flexibility's sustained, unresolving hold.
Identify
Observation 3: a gentle attempt to lift his arm meets almost no resistance, but a deliberately firmer attempt to bend his elbow further meets an equally firm, matched counter-pressure, without any change in his expression. What is this sign?
Correct. Resistance that scales with the examiner's own applied force is the specific, defining quality of gegenhalten.
Focus on how the resistance changes as the examiner applies more force: here it matches, proportionally, whatever force is applied — that force-matching quality is what names this sign, distinct from a fixed, wax-like resistance.
Key discriminating feature: Resistance that matches whatever force the examiner applies — light resistance to a gentle movement, proportionally greater resistance to a firmer one — is the defining, force-matching quality of gegenhalten.
Identify
Observation 4: having been clearly told to resist any attempt to move his arm, he allows the examiner to lift it with only moderate effort, and it settles back to his side once released. When tested again with just a fingertip's pressure under his elbow, his arm rises to follow that faint pressure just as readily. What is this sign?
Correct. Freely following movement — including the lightest possible pressure — despite being explicitly told to resist is the specific signature of Mitmachen/Mitgehen.
Focus on the instruction he was given (to resist) and what actually happened (no meaningful resistance at all, even to a fingertip) — that specific combination is what names this sign.
Key discriminating feature: Moving freely despite an explicit instruction to resist, returning to the starting position once released, and following even the lightest possible pressure (Mitgehen) is specific to this sign — the explicit resistance instruction being disregarded is the key detail.
Discriminate
Which single instruction, given before testing, most reliably distinguishes Mitmachen/Mitgehen from the other three signs?
Correct. The explicit resist instruction, and whether it's actually followed, is exactly what isolates Mitmachen/Mitgehen from the other three signs.
Eye closure, which arm is tested, and explaining the signs to the patient don't isolate any of these four — the explicit resist instruction, and whether the patient actually resists, does.
Key discriminating feature: A complete absence of resistance despite an explicit instruction to resist is the specific, defining feature of Mitmachen/Mitgehen, distinguishing it from the other three signs, none of which depend on this instruction.
Common misconception: Students often treat all four as one blurred idea of "catatonic limbs staying where you put them," without appreciating that some of these signs (gegenhalten, Mitmachen/Mitgehen) are actually defined by the quality of resistance during the movement, not by what happens afterward.
Elicit
Which single bedside approach best distinguishes waxy flexibility's resistance quality from gegenhalten's?
Correct. Comparing resistance across a gentle and a firmer movement is exactly the manoeuvre that separates these two resistance qualities.
Asking the patient, using only light touch, or timing what happens after release don't test the specific quality of resistance during the movement itself, which is what actually separates these two signs.
Clinical interviewing principle: Comparing the resistance quality across a gentle movement and a deliberately firmer one is what separates a fixed, wax-like resistance (waxy flexibility) from a force-matching one (gegenhalten) — gegenhalten's matching quality often makes it easy to miss unless a firmer movement is specifically attempted.
Explain
Why does what happens after the limb is released matter so much for separating waxy flexibility, catalepsy, and Mitmachen, even when the initial passive movement can look similar for all three?
Correct. Three distinct release patterns — sustained holding, slow spontaneous sinking, and immediate return — are exactly what separate these three signs once the limb is let go.
Retestability, fatigue, and dismissing release behaviour as insignificant all miss the point — the specific pattern of what happens on release is a genuinely distinguishing feature across these three signs.
Integrate
All four signs are tested with essentially the same passive-movement manoeuvre. What three things must an examiner attend to, together, to reliably tell all four apart in a single bedside examination?
Correct. Resistance quality during the movement, behaviour on release, and the resist instruction together are what allow all four signs to be told apart from what is, at heart, the same simple manoeuvre.
Diagnosis, age, illness duration, movement speed, and eye contact don't distinguish these four signs — resistance quality during the movement, release behaviour, and the resist instruction, taken together, do.
Summary
All four signs describe how a catatonic patient's limbs respond to passive movement, and the bedside test for each is essentially the same manoeuvre asked in a slightly different way. What separates them is the quality of resistance encountered during the movement, what happens once the limb is released, and whether the patient was explicitly told to resist beforehand — attending to all three, in the same examination, is what lets an examiner tell all four apart reliably.
Finish caseReferences
- Casey, P. & Kelly, B. (2019). Fish's Clinical Psychopathology, 4th ed. Ch. 8, 'Motor Disorders'.