Thanks. A couple of ideas mentioned there for anyone else: "measuring cortical excitability in the primary visual cortex" and measuring skin perspiration/fear r

Thanks. A couple of ideas mentioned there for anyone else: "measuring cortical excitability in the primary visual cortex" and measuring skin perspiration/fear response in a situation where a story that triggers mental imagery is followed by imagery that might "amplify" the former. These both seem rather limited to measurements in study groups and both require equipment, but interesting nonetheless!