So they are going off blood flow and activity? That doesn't mean little lies make big lies easier in a emotional or stress sense, just that you are faster at them or more reflexive. I'm so tired of people acting like consciousness is a sum of it's parts.
also, it was A STUDY in a research hospital. here is the problem, lying in a study is NEVER going to be the same as lying in a organic situation where no one knows but you.
That is another thing I am tired of, studies in a research office where after you go through a sorting questionnaire someone with a clip board asks "I give you 100 dollars but that means he gets $20 less... etc etc but you have to go lie to him about it etc etc but I take away this $1 bag of tasty corn chips" ---reseacer: ""Ah see! this proves people will sell cornchips for $100 and lie about it!"". ', They think this some how reflects what someone would do in the real world.
protip: people don't act how they say they will, so ASKING them about something is worthless, and having them do it in a study group is only slightly less worthless.