Franz Gall observed a soldier who had received a knife wound through his eye, damaging the frontal lobe on the left side of his brain. The man could no longer speak. After careful observation of the man's behavior, Gall described and analyzed the soldier's problem. Based on the study design, when used as evidence, Gall's research could not:

Question

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Gall's research, based on a single case study, can provide detailed information about the specific case and contribute to theories of the brain, but it cannot establish cause and effect due to the lack of control and comparison groups.

Franz Gall Observed a Soldier Who Had Received a Knife