Which component of the Glasgow Coma Scale tends to be most predictive of overall outcome?

• A. Eye opening.
• B. Motor response.
• C. Verbal response.
• D. All equally predictive.

Answer: (B)

Motor response is the most predictive of overall outcome. This component reflects the integrity of key neural pathways that underlie purposeful movement and automatic motor control, which closely track the brain’s overall injury severity and its impact on functional ability. In practice, higher motor scores consistently correlate with better recovery prospects and independence, making motor response a strong prognostic indicator. Eye opening can be influenced by medications, fatigue, or local eye injuries, and verbal response is often limited or unreliable in patients who are intubated or aphasic, reducing their usefulness for predicting long-term outcome. Therefore, the motor component tends to offer the most reliable single measure of likely outcome.