On Twitter this week I joked that neuroscientists could save money on brain scanners by just asking people how active their brains are.

Why do we spend so much on neuroimaging and then rely on self-report measures of the other variables of interest? Why not self-report brain activity, how active is your amygdala 1-10? https://t.co/ph3A2Uc6zc— Neuroskeptic (@Neuro_Skeptic) November 6, 2019

However, it turns out that there has already been a study that actually asked people to do this,