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: "Here is how it works: first you decide to treat the object whose behavior is to be predicted as a rational agent; then you figure out what beliefs that agent ought to have, given its place in the world and its purpose. Then you figure out what desires it ought to have, on the same considerations, and finally you predict that this rational agent will act to further its goals in the light of its beliefs. A little practical reasoning from the chosen set of beliefs and desires will in most instances yield a decision about what the agent ought to do; that is what you predict the agent will do." (Daniel Dennett, The Intentional Stance, p. 17) DENNETT'S THREE LEVELS The core idea is that, when explaining and predicting the behavior of an object, we can choose to view it at varying levels of abstraction. The more concrete the level, the more accurate ''in principle'' our predictions are. The more abstract, the greater the computational power we gain by zooming out and skipping over the irrelevant details. Dennett defines three levels of abstraction:
A key point is that switching to a higher level of abstraction has its risks as well as its benefits. For example, when we view both a bimetallic strip and a tube of mercury as thermometers, we can lose track of the fact that they differ in accuracy and temperature range, leading to false predictions as soon as the thermometer is used outside of the circumstances it was designed for. For example, the actions of a mercury thermometer heated to 500°C can no longer be predicted on the basis of treating it as a thermometer; we have to sink down to the physical stance to understand it as a melted and boiled piece of junk. For that matter, the actions of a dead bird are not predictable in terms of beliefs or desires. Even when there is no outright error, a higher level stance can simply fail to be useful. If we were to try to understand the thermometer at the level of the intentional stance, ascribing to it beliefs about how hot it is and its desire to keep the temperature just right, we would gain no traction over the problem as compared to staying at the design stance, but we would assume increased risks of error. Whether to take a particular stance, then, is determined by how successful that stance is when applied. Dennett argues that it is best to understand human beliefs and desires at the level of the intentional stance, without making any specific commitments to any deeper reality to the artifacts of Folk Psychology . In addition to the controversy inherent in this, there is also some dispute about the extent to which Dennett is committing to Realism about mental properties. Initially, Dennett's interpretation was seen as leaning more towards Instrumentalism , but over the years, as this idea has been used to support more extensive theories of Consciousness , it has been taken as being more like Realism. His own words suggest something in the middle, as he suggests that the self is as real as a center of gravity, "an Abstract Object , a theorist's fiction", but Operationally valid. {Link without Title} OBJECTIONS AND REPLIES The most obvious objection to Dennett is the instinctive thought that it matters to us whether an object has an inner life or not. You don't just imagine the intentional states of other people in order to predict their behaviour; the fact that they have thoughts and feelings just like you do is central to notions such as trust, friendship and love. The ''Blockhead argument'', as it is known, proposes that someone, Jones, has a twin who is in fact not a person but a very sophisticated robot which looks and acts like Jones in every way, but who does not have any thoughts or feelings at all, just a chip which controls his behaviour; in other words, "the lights are on but no one’s home." According to the intentional systems theory, Jones and Blockhead have precisely the same beliefs and desires, but this seems false. The IST expert assigns the same mental states to Blockhead as he does to Jones, "whereas in fact (Blockhead) has not a thought in his head." Dennett has argued against this by denying the premise, on the basis that the Blockhead is a Philosophical Zombie and therefore logically impossible. In other words, if something acts in all ways conscious, it necessarily is, as consciousness is defined in terms of behavioral capacity, not ineffable Qualia . Another objection attacks the premise that treating people as ideally rational creatures will yield the best predictions. Stephen Stich argues that people often have beliefs or desires which are irrational or bizarre, and IST doesn’t allow us to say anything about these. Of course if the person's "environmental niche" is examined closely enough, and the possibility of malfunction in their brain (which might affect their reasoning capacities) is looked into, it may be possible to formulate a predictive strategy specific to that person. Indeed this is what we often do when someone is behaving unpredictably - we look for the reasons why. In other words, we can only deal with irrationality by contrasting it against the background assumption of rationality. This development takes away from the simplicity of the theory but is not explicitly an argument against it. The rationale behind the intentional stance is based on evolutionary theory, particularly the notion that the ability to make quick predictions of a system’s behaviour based on what we think it might be thinking was an evolutionary adaptive advantage. The fact that our predictive powers are not perfect is a further result of the advantages sometimes accrued by acting contrary to expectations. If we take the intentional stance at face value; that is, as a conceptual tool and not as a literal definition of the mind, then it works in a roughly Constructive Empiricist fashion to yield accurate results. "''What'' is done, not ''how'' it is done, is what counts", and the intentional stance may help us to understand the mind better than many other available theories which make stronger claims but can be refuted. SEE ALSO
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