Readers may recall that my 2016 book, Rightness as Fairness: A Moral and Political Theory, argues that morality emerges from a specific form of "mental time-travel": our ability to imagine and care about different possible futures. Specifically, I argue that morality--specifically, the rationality of obeying four principles of fairness--emerges from an adaptive form of gambling avoidance that makes us concerned less about the likely future outcomes of our actions, and instead overwhelmingly concerned with avoiding unlikely bad outcomes. As I have mentioned before, there is already quite bit of empirical evidence that coheres well with this picture. As I have also mentioned before, Rightness as Fairness specifically predicts (on pp. 67-70) that psychopaths behave immorally because they are overwhelmingly concerned with likely outcomes in the near future, lacking the mental-time travel capacities that lead us to imagine and aim to avoid unlikely bad outcomes.
In addition to another recent study cohering with this picture, a new study in Neuron shows that:
[B]rain scans of nearly 50 prison inmates...help explain why psychopaths make poor decisions that often lead to violence or other anti-social behavior. What they found, he said, is psychopath's brains are wired in a way that leads them to over-value immediate rewards and neglect the future consequences of potentially dangerous or immoral actions...
What they found, Buckholtz said, was people who scored high for psychopathy showed greater activity in a region called the ventral striatum - known to be involved in evaluating the subjective reward - for the more immediate choice.
"So the more psychopathic a person is, the greater the magnitude of that striatal response," Buckholtz said. "That suggests that the way they are calculating the value rewards is dysregulated - they may over-represent the value of immediate reward."...
"We mapped the connections between the ventral striatum and other regions known to be involved in decision-making, specifically regions of the prefrontal cortex known to regulate striatal response," he said. "When we did that, we found that connections between the striatum and the ventral medial prefrontal cortex were much weaker in people with psychopathy."
That lack of connection is important, Buckholtz said, because this portion of the prefrontal cortex role is thought to be important for 'mental time-travel' - envisioning the future consequences of actions. There is increasing evidence that prefrontal cortex uses the outcome of this process to change how strongly the striatum responds to rewards. With that prefrontal modulating influence weakened, the value of the more immediate choice may become dramatically over-represented...
The effect was so pronounced, Buckholtz said, that researchers were able to use the degree of connection between the striatum and the prefrontal cortex to accurately predict how many times inmates had been convicted of crimes.
Ultimately, Buckholtz said, his goal is to erase the popular image of psychopaths as incomprehensible, cold-blooded monsters and see them for what they are - everyday humans whose brains are simply wired differently.
"They're not aliens, they're people who make bad decisions," he said. "The same kind of short-sighted, impulsive decision-making that we see in psychopathic individuals has also been noted in compulsive over-eaters and substance abusers. If we can put this back into the domain of rigorous scientific analysis, we can see psychopaths aren't inhuman, they're exactly what you would expect from humans who have this particular kind of brain wiring dysfunction."
I leave it to readers to decide how well these and other studies reflect on Rightness as Fairness, and whether they should lead philosophers to take its account of morality seriously.
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