I'm not sure it is that much of a leap. That's not to say that a person will be rational by suppressing those emotions, but as long as the emotions are suppressed, but not the information about any situations that led to those emotions, the person may be able to more objectively assess a situation.
That is, there are assumptions involved, but I think a case could be made that emotions are a way to bypass rational thought when it's less efficient, useful (too slow for the situation) or lack of information (or lack of our own capability) causes us to fall into local maxima thinking (e.g. love, distrust of the different, etc).
If tDCS helps test this in some manner, that would also be good. We of course need a lot more information on what tDCS actually does first though. It's entirely possible that the described effects are not what is happening at all, just what it feels like. Measuring the state of the mind is weird.
That is, there are assumptions involved, but I think a case could be made that emotions are a way to bypass rational thought when it's less efficient, useful (too slow for the situation) or lack of information (or lack of our own capability) causes us to fall into local maxima thinking (e.g. love, distrust of the different, etc).
If tDCS helps test this in some manner, that would also be good. We of course need a lot more information on what tDCS actually does first though. It's entirely possible that the described effects are not what is happening at all, just what it feels like. Measuring the state of the mind is weird.