Sunday, March 3, 2013

Morality and neuro-porn



(parallel circuits of prefrontal cortex and basal ganglia)

I am reading a neuro-porn article about morality. Neuro-porn is a sub-genre of popular science in which writers use imagery or description of brain scans to strengthen a point. In this article, the author is saying that moral judgments are an illusion because certain brain areas light up when a person is making a moral choice. In particular, many of the areas responsible for sub-conscious processing of emotions.

Well, brain areas light up when I am trying to catch a ball or learn how to shoot an arrow from a bow. Does this mean that space and time also do not exist? Furthermore, some of those areas will be responsible for subconscious processing of emotions, because emotions (salience) are crucial for people to learn. When I used to learn algebra, I actually felt the numbers through emotions: there were tricky variables, benevolent ones, etc. Math may or may not be a product of my mind (corresponding to objective reality or not), but I think it's silly to say that mathematical calculations are merely emotions.

Yes, it makes sense that our brain would express moral valuations through a feeling of disgust. But that doesn't necessarily mean that our moral judgments are simply products of feelings. That's just the "language" of the brain. Sometimes our brain uses one set of qualia to represent another set of information. Pain (or taste) feels as hot or sharp. It doesn't mean that temperature, pain, acute tactile pressure, and taste are the same thing.

Also, one should not discount the idea that subconscious processing of values could elicit subconscious emotional reactions. Another brain area that lights up consistently during moral choices is medial prefrontal cortex (mPFC). It is the area responsible for planning and execution of actions, but also for thinking about different outcomes and switching between strategies. It is one of the most advanced part of the human brain phylogenetically. Is mPFC being driven by the emotional centers? Does it drive them? Is there a more complicated picture? The causality is not clear, and I don't believe the state-of-the art fMRI can reveal it.

No comments: