An old friend once told us about his experiences as a child evacuee during the Second World War. Or rather, he didn’t: because those memories did not exist. Like those of millions of others, his experiences were agonisingly traumatic. And he had blotted them out altogether. News of how the brain achieves this erasure of painful memories comes in this story from the inimitable Nature Briefing called Dopamine hit overwrites memories of fear
| In mice, dopamine acts on neurons in a brain region called the basolateral amygdala (BLA) to kick-start fear extinction — the overwriting of fearful memories when danger has passed. Researchers found that this dopamine is produced in a separate part of the brain called the ventral tegmental area. Humans have “the same evolutionarily conserved parts of the brain that regulate these fear responses” as mice, says neuroscientist Larry Zweifel, which hints that neurons in the BLA could be a target for drugs to help to treat fear-related conditions such as post traumatic stress disorder.Nature | 4 min read Reference: Proceedings of the National Academy of Sciences paper |
Normally we would riff enthusiastically on the hopes of a cure for PTSD, or admire the ingenuity of the scientists who have made these discoveries. But today, if you’ll forgive us, we want to go in a different direction.
For if unconscious and automatic healing processes of the brain can so affect our memories, what does that say about our consciousness? Are you really in charge of the way you remember, feel, and think? At first glance this may seem to be the abstract playground of a lot of philosophers, psychologists and neuroscientists. The trouble for us is that many religious and economic systems depend on the assumption that each of us is an autonomous individual. Who freely chooses between good and evil or cheap and expensive. And these doctrines affect the real lives of millions. As Keynes observed, every politician who prides himself on being an entirely pragmatic individual is always the intellectual slave of some long dead economist. The writers of many religious books are much older still: but millions still kill and die for their words. We freely admit to being utterly baffled by all this, and are unlikely to return to anything quite so intricate again any time soon. But next time we hear anyone declaiming confidently on things like politics or religion, we will wonder deeply about what is happening in their mind,
As promised above we will endeavour to keep away from all this philosophical stuff. But if you want to know more, the works of Timothy O’Connor, Ben G Yacobi, Benjamin Libet, Daniel Dennet and Sigmund Freud provide useful starting points.
#free will #neurology #unconscious #conscious mind #economics #religion #politics #philosophy
Learning, Science and Society 