He is writing about the nature of reality, and how it is currently perceived in terms our conceptual understanding, and how the latter predetermines our ongoing observation of the natural  world, to the point that the notion of being able to look at the world objectively – something that should be at the core of all scientific inquiry – may no longer make sense. When I read this,  the first thing that came to mind was something that Nietzsche once said: There is no immaculate perception.

In this context Kastrup invokes Tomas Kuhn’s  idea of the paradigm shift – first introduced in 1962 – when it becomes necessary to start questioning the accepted model of a scientific theory or concept on the basis of an increasing number of observations that are deemed anomalous when they don’t  fit within the prevailing model. You need to read Kastrup’s complete article to see the specific anomalies he is referring to for his argument.

The Kastrup article boils down to the the distinction between mind  and matter – the experiential or mental world and  the material or physical world  – and the  need to question the belief “that nature consists of arrangements of matter/energy outside and independent of mind.”  The anomalies he cites in the article question this independence, and while the issue arises at the Quantum level of observation, the inference is that there are implications for the larger view of the nature of reality.

I am interested in the nature of the distinction between mind and matter, or, if you will, the mental realm and the physical realm. The traditional view of mind and matter is that, while our physical bodies are  part of the material  world, our conscious minds minds  are something over and above the material world, in the sense that consciousness as a phenomenon cannot be explained in terms of its underlying material complexity.  As a result a duality has been introduced which has been less than helpful in trying to understand how the mental realm and the physical realm are related.

The distinction as taken mutually exclusive led Immanuel Kant to postulate the “ding an sich” – or “thing-in-itself” – as something fundamentally unknowable as a cause behind the experiential world, and something that Schopenhauer faulted him for because it would take the concept of cause and effect beyond what it could deliver, logically, in terms being able to infer a cause from an effect.

However, instead of postulating an unknown and in fact  unknowable really behind the world, Schopenhauer himself proposed a different kind of duality, by giving the world an inside and an outside, with the outside being the objective experiential world of our knowledge, and on the inside the true nature or essence of the world. The latter is not directly knowable as object of knowledge, yet we are conscious of its presence within our bodies as something that is over and above our actions and motivations that guide our interaction with the world.

I have some sympathy for the Schopenhauer position, if only because it is a less complex view of of the world. As well, we can reconcile it to some extent within the Spinoza one substance view which holds that both the mental and physical are part of the same substance – God –  and without the  distinction between the inside and outside of matter, but suggesting instead that humans could only apprehend two attributes of this one substance, namely thought and extension.

We are left with the suggestion that there is only one way for us to be in the world, and if there is any duality to it, it is within ourselves and a function of how we see the world and are able to interact with it.  This is the duality that is implicit  in the distinction between subject and object, the observer and the observed, between the  mind and its experiential content. In the end, however, these are  false distinctions, as it is the world looking at the world, creating the illusion of separate and ontologically distinct realms – the mental realm and the physical realm – while in fact both of them are one and the same reality. The conclusion has to be that there is no other reality, thus belying the  notion that “nature consists of arrangements of matter/energy outside and independent of mind”.

Given this line of thought  I suspect that  Mr. Kastrup’s Quantum Anomalies  are features of the mind-matter / subject-object distinction, when – at the QM or subatomic level – there appear to be  limits to what can be observed seemingly  independently from the observer, when the very process of observing bleeds into the object or event  being observed  and has become a case of the mind looking back at itself when it is  no longer being able to hold on to the distinction.

The truth about man is that he is not a pure knowing subject, not a winged cherub without a material body, contemplating the world from without. For he is himself rooted in that world.  (Schopenhauer – The World as Idea)