Abstract
Theory of Mind, the cognitive capacity to attribute internal mental states to oneself and others, is a crucial component of social skills. Its formal study has become important, witness recent research on reasoning and information update by intelligent agents, and some proposals for its formal modelling have put forward settings based on Epistemic Logic (EL). Still, due to intrinsic idealisations, it is questionable whether EL can be used to model the high-order cognition of ‘real’ agents. This manuscript proposes a mental attribution modelling logical framework that is more in-line with findings in cognitive science. We introduce the setting and some of its technical features, and argue why it does justice to empirical observations, using it for modelling well-known False-Belief Tasks.
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Notes
- 1.
There has been a debate on how this understanding of others’ mental states is achieved (see, e.g., [2]). Some argue that it is by acquiring a theory of commonsense psychology (theory theory); some others argue that it comes from a direct simulation of others’ mental states (simulation theory). We will use the term ToM without endorsing any of these views, as such discussion falls outside the scope of this proposal.
- 2.
Frameworks for representing acts of private communication [11] make this clear. Their additional structures, action models, have one ‘event’ for each different perspective the agents might have about the communication, and the model after the communication contains roughly one copy of the original model for each one of these perspectives.
- 3.
- 4.
In particular, one goal is to find a system that provides a plausible answer on why people find mental attribution tasks increasingly difficult as their order increases.
- 5.
Following the common parlance in the literature describing the tasks we later model, the term belief will be used for referring to an agent’s mental state.
- 6.
Each object has a proper colour: \(\kappa _s(o) \in R_o\) holds for all \(s \in S\) and \(o \in O\).
- 7.
Every agent can see herself in every state: \(a \in \nu _s(a)\) holds for all \(s \in S\) and all \(a \in A\).
- 8.
In particular, \([s]_{-0} = s\). Note also how \([s]_{-t}\) is undefined for \(t > \tau (s)\).
- 9.
Notice that visibility of each agent is not ‘common knowledge’: knowledge relies on visibility, and an agent can see without being seen (Subsect. 3.1). Additionally, our simplifying assumption might be a problem for attributions under (semi-)private actions. Work of [22, 23] can be especially relevant in that respect.
- 10.
Note: a single ‘predecessor’ modality is insufficient, as the number of back steps the recursive exploration requires is a priori unknown. A modality for its reflexive and transitive closure is still not enough: it takes care of the recursive search for a state satisfying the visibility condition, but on its own cannot indicate that every state up to that point should not satisfy it. More on the adequacy of since can be found in [27].
- 11.
Within propositional dynamic logic [29], and in the presence of the converse , the since modality can be defined as , with “” indicating relational test, “” indicating sequential composition, “” indicating non-deterministic choice, and “” indicating one or more iterations.
- 12.
Since \(\mathcal {L'}\)-formulas are evaluated with respect to a TV model’s last state, it is enough for a bisimulation to establish a connection between those states, as the definition does.
- 13.
- 14.
Although it is always possible to evaluate attributions of any length (like in possible-worlds semantics), our semantic clause offers a mechanism to account for human reasoning limitations, indicated by empirical research, e.g. on working memory [38]. It allows us to trace how many states need to be held in working memory, and therefore explain why attribution-making might fail from some point on.
- 15.
For example, the act through which, in the absence of Sally, Anne moves the marble from the basket to the box, is understood as a private announcement through which only Anne is informed about the marble’s new location.
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Solaki, A., Velázquez-Quesada, F.R. (2019). Towards a Logical Formalisation of Theory of Mind: A Study on False Belief Tasks. In: Blackburn, P., Lorini, E., Guo, M. (eds) Logic, Rationality, and Interaction. LORI 2019. Lecture Notes in Computer Science(), vol 11813. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-60292-8_22
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