Joana Rigato

The relation between the mind, especially its conscious activity, and the brain is a mysterious one. In this chapter, two empirical models of mental causation put forward by two Nobel Laureates will be discussed. The first is John Eccles’ interactionist theory, according to which mind and brain interact by means of the influence that conscious choice has in the quantum chance that a certain probabilistic event such as exocytosis (the basic unit of neural activity) take place in the brain. The second empirical model presented is Eugene Wigner’s interpretation of what happens when one measures a quantum system, and the wave function of different less than-unity probabilities collapses into one single well-defined state. According to Wigner and others, consciousness is the cause of this collapse. By discussing these two theories, this chapter wishes to argue that the reductionist answer to the mind-brain problem should not be taken as its final solution. In fact, there are open problems in both science and philosophy and consciousness in one of the cases where the sets of open problems intersect.

Human behavior can range from automatic and even unconscious bodily movements to very elaborate and rational decisions. In this paper I develop a taxonomy based on the empirical analysis of the phenomenology associated with selected instances of different forms of behavior. The transition from sub-actional behavior to proper actions is shown to take place when the agent intervenes actively in the causal process leading from her mental states to the bodily movement by exercising her power to form intentions to act. It is argued that this type of analysis could be helpful to agent-causal accounts of action and free will.

Science aims to transform the subjectivity of individual observations and ideas into more objective and universal knowledge. Yet if there is any area in which first-person experience holds a particularly special and delicate role, it is the sciences of the mind. According to a widespread view, first-person methods were largely discarded from psychology after the fall of introspectionism a century ago and replaced by more objective behavioral measures, a step that some authors have begun to criticize. To examine whether these views are sufficiently informed by actual scientific practice, we conducted a review of methodological approaches in the cognitive science literature. We found that reports of subjective experience are in fact still widely used in a broad variety of different experimental paradigms, both in studies that focus on subjective experience, and in those that make no explicit reference to it. Across these studies, we documented a diverse collection of approaches that leveraged first-person reports, ranging from button presses to unstructured interviews, while continuing to maximise experimental reproducibility. Common to these studies were subjects acting as sensors, intentionally communicating their experience to the experimenter, which we termed “second-person” methods. We conclude that, despite views to the contrary, first-person experience has always been and is still central to investigations of the mind even if it is not recognized as such. We suggest that the conversation ought to be reframed: instead of debating whether to accept subjects’ first-person knowledge we should discuss how best to do so.

In the context of the free will debate, both compatibilists and event-causal libertarians consider that the agent’s mental states and events are what directly causes her decision to act. However, according to the ‘disappearing agent’ objection, if the agent is nothing over and above her physical and mental components, which ultimately bring about her decision, and that decision remains undetermined up to the moment when it is made, then it is a chancy and uncontrolled event. According to agent-causalism, this sort of problem can be overcome if one realizes that the agent herself, as an irreducible substance, is the true originator of her actions. I’ll present arguments that favor this view. Event-causalists have countered that if the agent identifies with some of the inner states that play the self-determining causal role in bringing about the action, then it is as though the action was directly caused by herself. I’ll object that this is not a distinctive aspect of free agency. Agent-causalism has been criticized from most naturalistically inclined fronts, and it must address risks of implausibility, contradiction and unintelligibility. Even though I’ll acknowledge these challenges, I’ll still argue that libertarian free will cannot be defended by any reductionist alternative, and that agent-causalism does not conflict with contemporary science but only with some of its unproven assumptions.

Spontaneous actions are preceded by brain signals that may sometimes be detected hundreds of milliseconds in advance of a subject's conscious intention to act. These signals have been claimed to reflect prior unconscious decisions, raising doubts about the causal role of conscious will. Murakami et al. (2014. Nat Neurosci 17: 1574–1582) have recently argued for a different interpretation. During a task in which rats spontaneously decided when to abort waiting, the authors recorded neurons in the secondary motor cortex. The neural activity and relationship to action timing was parsimoniously explained using an integration-to-bound model, similar to those widely used to account for evidence-based decisions. In this model, the brain accumulates spontaneously occurring inputs voting for or against an action, but only commits to act once a certain threshold is crossed. The model explains how spontaneous decisions can be forecast (partially predicted) by neurons that reflect either the input or output of the integrator. It therefore presents an explicit hypothesis capable of rejecting the claim that such predictive signals imply unconscious decisions. We suggest that these results can inform the current debate on free will but must be considered with caution.

Despite its recent popularity, Emergence is still a field where philosophers and physicists often talk past each other. In fact, while philosophical discussions focus mostly on ontological emergence, physical theory is inherently limited to the epistemological level and the impossibility of its conclusions to provide direct evidence for ontological claims is often underestimated. Nevertheless, the emergentist philosopher’s case against reductionist theories of how the different levels of reality are related to each other can still gain from the assessment of paradigmatic examples of discontinuity between models in physics, even though their implications must be handled with care.

Agent-causal theories of free will, which rely on a non-reductionist account of the agent, have traditionally been associated with libertarianism. However, some authors have recently argued in favor of compatibilist agent-causal accounts. In this essay, I will show that such accounts cannot avoid serious problems of implausibility or incoherence. A careful analysis of the implications of non-reductionist views of the agent (event-causal or agent-causal as they may be) reveals that such views necessarily imply either the denial of the principle of supervenience or the assumption of bottom-level indeterminism. I will contend that the former alternative comes at a high cost, while the latter is quite plausible. Therefore, providing that they accept the condition of the truth of indeterminism, non-reductionist accounts of the agent do not have to contradict our scientific worldview. Interestingly, while they should be taken seriously by anyone who is concerned with the passivity of the agent’s role under a reductionist scenario, non-reductivist accounts end up contributing an extra incompatibilist argument to the free will debate.

In the context of the free will debate, both compatibilists and event-causal libertarians consider that the agent’s mental states and events are what directly causes her decision to act. However, according to the ‘disappearing agent’ objection, if the agent is nothing over and above her physical and mental components, which ultimately bring about her decision, and that decision remains undetermined up to the moment when it is made, then it is a chancy and uncontrolled event. According to agent-causalism, this sort of problem can be overcome if one realizes that the agent herself, as an irreducible substance, is the true originator of her actions. I’ll present arguments that favor this view. Event-causalists have countered that if the agent identifies with some of the inner states that play the self-determining causal role in bringing about the action, then it is as though the action was directly caused by herself. I’ll object that this is not a distinctive aspect of free agency. Agent-causalism has been criticized from most naturalistically inclined fronts, and it must address risks of implausibility, contradiction and unintelligibility. Even though I’ll acknowledge these challenges, I’ll still argue that libertarian free will cannot be defended by any reductionist alternative, and that agent-causalism does not conflict with contemporary science but only with some of its unproven assumptions

: To act is to be the author of an intentional bodily movement. I will show that, in order for that authorship to be assured, the agent must both amount to more than the mereological sum of her mental or neural states and events, and have an irreducible causal power over, at least, some of them. Hence, agent-causalism is the best position for any realist about action to assume. I will contend that, contrary to what many have claimed, agent-causalism is not an unscientific theory, since it can ground its view of the agent on a form of emergent dualism that can account for robust forms of agency without having to challenge the natural supervenience of the mental on the physical. I claim that the conditions of possibility for a causally effective emergent self are the presence of neuronal indeterminism and the break of causal closure, both of which will be shown to be compatible with our current scientific picture of the world. Keywords: Action; Self; Emergent Dualism; Downward Causation; Indeterminism Prendere sul serio l’agente: ovvero, come un’attenta analisi dell’agentività ci conduce al dualismo emergentista Riassunto: Agire vuol dire essere l’autore di un movimento corporeo intenzionale. Intendo mostrare che, per assicurarsi il riconoscimento di essere l’autore di un’azione, l’agente debba essere più della semplice somma mereologica dei propri stati mentali ed eventi neurali e che debba anche avere un irriducibile potere causale su di essi, o al limite su parte di essi. Pertanto, una concezione causale riferita all’agente è la migliore posizione da assumere per chi voglia dirsi realista riguardo alle azioni. Intendo affermare che, diversamente a quanto da molti sostenuto, la concezione causale riferita all’agente non sia una teoria non scientifica, dal momento che può fondare la sua concezione dell’agente su una forma di dualismo emergentista in grado di legittimare forme robuste di agentività senza dover mettere in dubbio la sopravvenienza del mentale sul fisico. Indeterminismo neurale e rottura della chiusura causale saranno indicate come condizioni di possibilità per un sé causalmente ed effettivamente emergente e mostrerò come entrambi siano compatibili con l’immagine scientifica del mondo che oggi abbiamo. Parole chiave : Azione; Sé; Dualismo emergentista; Causalità rivolta verso il basso; Indeterminismo