The document discusses memory impairment from traumatic brain injury (TBI). It describes how TBI typically affects explicit (declarative) memory more than implicit (non-declarative) memory. Studies discussed showed children with TBI had deficits in explicit memory tasks like recall but intact implicit memory as seen in priming tests. Brain imaging research found different brain regions activated during explicit versus implicit memory retrieval. The document also examines how TBI can impair autobiographical and semantic versus episodic memory, as seen in case studies of patients lacking episodic memory detail but retaining semantic facts.