Which is an example of reverse inference?

• A. Brain region maps to a single function.
• B. Observing visual cortex activity when viewing images.
• C. HRV indicates stress resilience.
• D. Assuming a person is feeling pain because the anterior cingulate cortex is active.

Answer: (D)

Reverse inference is inferring a specific mental state or experience from observed brain activity. In this example, assuming someone is feeling pain because the anterior cingulate cortex is active exemplifies reverse inference because the ACC participates in many processes beyond pain—emotion, attention, error monitoring, and cognitive control. Activation in this region does not uniquely indicate pain, so drawing the conclusion about the person’s felt pain goes from brain activity to a mental state, which is exactly what reverse inference describes.

Other scenarios don’t illustrate this: one describes a straightforward mapping where a brain region is linked to a function, which is a forward or localization claim rather than inferring experience from brain data; another simply notes brain activity in response to a stimulus without attributing a specific internal state; another cites a physiological marker (HRV) as indicating resilience, which is a biomarker-to-trait claim rather than inferring a mental state from brain activity. The key idea is that reverse inference jumps from brain activation to what someone is experiencing, and that leap is what makes it problematic.