Which is a negative sign in CNS lesions?

Which is a negative sign in CNS lesions?

• A. Increased balance
• B. Underactive motor behaviors such as weakness
• C. Hypertonia
• D. Hyperactive stretch reflexes

Answer: (C)

In CNS (upper motor neuron) lesions, signs are categorized as negative (loss of function) versus positive (increased or abnormal function). A negative sign means something is diminished, such as weakness or reduced movement. Hypertonia and hyperactive stretch reflexes are examples of positive signs because they reflect increased tone or reflex activity. Therefore, the negative sign described is underactive motor behaviors like weakness.

In CNS (upper motor neuron) lesions, signs are categorized as negative (loss of function) versus positive (increased or abnormal function). A negative sign means something is diminished, such as weakness or reduced movement. Hypertonia and hyperactive stretch reflexes are examples of positive signs because they reflect increased tone or reflex activity. Therefore, the negative sign described is underactive motor behaviors like weakness.