Final answer:
A Glasgow Coma Scale (GCS) score of 15 is normal and suggests that the brain is fully functioning.
Step-by-step explanation:
The Glasgow Coma Scale (GCS) is a medical assessment tool used to evaluate a person's level of consciousness after a brain injury. The GCS measures three aspects: eye opening, verbal response, and motor response. Each aspect is scored on a scale of 1 to 4 or 1 to 6, depending on the specific response. A GCS score of 15 is considered normal and indicates that the brain is fully functioning. This means that the person's eyes open spontaneously, they are alert and oriented, and they are able to physically respond appropriately to verbal commands.