Final answer:
The comatose state after head trauma is a topic in Biology that involves studying brain function and the effects of injuries on consciousness.
Step-by-step explanation:
The comatose state of a child who has sustained a head trauma falls under the subject of Biology, more specifically, in areas related to neurology and brain function. Despite the EEG indicating normal brain patterns, the child remains in a coma, suggesting significant injury or disruption to the brain's function. Recovery and prognosis in such cases depend on a multitude of factors, including the severity and location of the trauma, the speed of medical response, and subsequent medical care.