I’ve always been curious about this. Now, before I start, I’m aware that the answer is ‘it’s complicated’. I’m gonna pretend, at least for a little while, that this isn’t the case and a simplistic solution is possible, just to motivate the question being in a certain form.
So, what is the subject matter of psychology? This might seem straight forward (it’s people, stupid) but I’ve never been sure. So, someone engaged in research describes a discrete, relatively isolated psychological mechanism, is what they’re describing an
1). aspect of observation, so makes no strong claims about the psyche itself. You fit together little, modal elements of behaviour, bound by a descriptive term, and then look for cross-cultural patterns based on this first weak assumption.
2). aspect of our psychological construction that is, at least, relatively necessary. So, you analyse behaviour of agents X, Y and Z (x1000) and, when they all display the same behaviour (accounting for variables and situational conditions) you’re left with an element of the self-structure that is part of what it means to be an agent. This further implies that we are necessarily NOT tabula rasa: the river may take a different course each time, but that landscape that forms it has definite contours and certain aspects of its route are determined simply by it following the rules of being a river.
3). True psychological claims can only be justified by appealing to aspects of construction, true, but structure only occurs at the neurological, biological level. There are no facts of mind, only facts of brain. Only these can be tested with scientific rigor and therefore form a justified claim about reality.
There are two problems with this… spiel. First that, if anything, it probably involves all three, where you have observations of repeated phenomena, you test them to see if they represent anything underlying (or beyond conscious thought) and then, if this becomes particularly well established, you start looking for connections across the descriptive layers we apply. Fine.
Secondly, how does one avoid the second position, roughly where I think psychology wants to be, collapsing into either one or three. How does one justify the existence of discreet psychological structures, with a definite nature and that can be empirically tested?
Long introduction to a short question really…