This need to be always on guard was an unmeasured expenditure of energy, the slow siphoning of the essence. It contributed to the fast breakdown of our bodies. So I feared not just the violence of this world but the rules designed to protect you from it, the rules that would have you contort your body to address the block, and contort again to be taken seriously by colleagues, and contort again so as not to give the police a reason.

Here’s what they found. In the brains of the students who received negative feedback the sympathetic nervous system lit up. This is the “fight or flight” system, the system that mutes the other parts of the brain and thus allows us to focus only on the information most necessary to survive. When this part of the nervous system is triggered, your heart rate goes up, endorphins flood your body, your cortisol levels rise, and you tense for action. This is your brain on negative feedback: it responds as if to a threat, and it narrows its activity. The strong negative emotions produced by criticism “inhibits access to existing neural circuits and invokes cognitive, emotional, and perceptual impairment,” psychology and business professor Richard Boyatzis said in summarizing the researchers findings.

Negative feedback doesn’t enable learning. It systematically inhibits it and is, neurologically speaking, how to create impairment.

In the students who received attention focused on their dreams and how they might go about achieving them, however, the sympathetic nervous system was not activated. Instead it was the parasympathetic nervous system that lit up. This is sometimes referred to as the “rest and digest” system. To quote the researchers again: “[T]he Parasympathetic Nervous System . . . stimulates adult neurogenesis (i.e., growth of new neurons) . . . , a sense of well being, better immune system functioning, and cognitive, emotional, and perceptual openness.”

In other words, positive, future-focused attention gives your brain access to more regions of itself and thus sets you up for greater learning. We’re often told that the key to learning is to get out of our comfort zones, but this finding gives the lie to that particular chestnut—take us out of our comfort zones and our brains stop paying attention to anything other than surviving the experience. It’s clear that we learn most in our comfort zone, because that’s our strengths zone, where our neural pathways are most concentrated. It’s where we’re most open to possibility, and it’s where we are most creative and insightful.

Rather than informing an appropriate course of action, the more immediate, visceral, intensely powerful, emotional - possibly blunter - response can overwhelm the slower, more elaborately calibrated, evaluative system. We become paralysed by fear. We lose a sense of control and panic ensues. Our thoughts are distorted and we become disorganised by fear. In this frenzied state of mind we cannot respond to reason.

Loneliness is more pervasive than ever before, and our ancient brains, designed to seek the safety of groups, experience those negative feelings as life-threatening, which leads to stress and sickness.

Marmot ended up concluding that the psychic feeling of being in control of your life is extremely important as a source of well-being, and that conversely, being out of control is physiologically harmful as wells s emotionally intolerable.

At various points in this book, we’ve noted that you can tell when a cybernetic system is overloaded because it breaks down. Marmot’s main conclusion from his research was that inequality in society was a major driver of public health risks, but it could be givens cybernetic interpretation too. The connection that he found looks like the result of a variety mismatch; people are, increasingly, unable to regulate the input from their immediate environment, and they correctly perceive this as a threat to health and life.