Counterattack
The patient was instructed to make a fist, with the upper limbs adducted at the shoulder joints and flexing the forearms against the chest. The inspector pulled his arm in the opposite direction and then suddenly let go. If the patient's forearm continues to flex hard at this time, his hand can counterattack his chest, which is a positive counterattack sign. Positive counterattack sign has reference significance for the diagnosis of cerebellar disease.
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