But you are conflating. What is 'understanding of the world'. The philosopher of mind Tim Crane has written quite a bit about this but the key thing is that there are two quite different aspects to beliefs and other so-called 'propositional attitudes'. There is a dispositional state that is there even when you are asleep - so when you wake and go to the door hearing a knock you faint on hearing a relative has died before you have even thought about it. Then there are the states of belief that we are aware of - as when we answer 'I believe so, yes'.
Some years back I wrote a paper in Frontiers in Psychology dissecting the various forms of mental representation involved. Any meaningful causal analysis has to separate the various meanings of 'understand' or 'believe' before you can producing anything that has scientific value. Goodexperimental psychologists know all about this and work with it but clinical psychologists by and large have no clue.
Certainly, we faint on hearing that a relative has died. I cried when I heard that my daughter was born by caesarian in the next room. But strangely I felt no equivalent emotion. I was tired and relieved. The journalist I spoke to said that her hair fell out when her mother died despite the fact that she felt no stress, only relief. She suggested that the hair falling out must have meant that really she was stressed. But what could that mean, since 'being stressed' also means the feeling of being stressed that was absent.
In other words, even in familiar experience of major life events what turns out to happen does not even make sense in terms of folk psychology. If the cognition or emotion of being stressed is defined as that which makes one feel stressed then it isn't whatever causes something to happen without that feeling.
Because none of this is testable both the lay community and the clinical psychologists get away with these magic stories about emotions and cognitions. OK, there must be some processes that link up in a fairly predictable way but in fact if I look back over the numerous personal disasters I have suffered the common pattern is that the folk psychological account gets what happens wrong most of the time. And when you start talking about bipolar disorder it goes completely out of the window.
What everyone needs to see and maybe Mr Monbiot is getting taste of, is that Popper was right - right down to the boots. All this stuff about cognitions is bullshit big time. And maybe it is not so surprising that if you work in a speciality that is based entirely on bullshit that you bullshit about your research.