What is a weakness of the biological approach regarding causation?

• A. It cannot show correlations
• B. It often relies on correlational data and cannot establish causation
• C. It proves causation easily
• D. It ignores the brain entirely

Answer: (B)

The key point is that the biological approach often shows relationships between brain activity or structure and behavior, but these findings are typically correlational. Seeing a brain region light up when a person performs a task doesn’t prove that the region causes the behavior; the relationship could go the other way, or a third factor—like genetics, environment, or a drug—could influence both brain activity and the behavior. Ethical and practical limits make it hard to manipulate human brains directly to prove causation, so much of the evidence remains associative rather than causal. While methods like brain stimulation, pharmacological challenges in animals, or lesion studies can provide causal evidence, they come with their own limits and don’t always generalize. That’s why this approach is viewed as limited for establishing causation.