According to a shared functionalist view in philosophy of mind, a cognitive system, and cognitive function thereof, is based on the components of the organism it is realized by which, indeed, play a causal role in regulating our cognitive processes. This led philosophers to suggest also that, thus, cognition could be seen as an extended process, whose vehicle can extend not only outside the brain but also beyond bodily boundaries, on different kinds of devices. This is what we call the (...) ‘Externally Extended Cognition Thesis.’ This notion has generated a lively debate. Here, we offer a novel notion of extended cognition, according to which cognition can be seen as being realized outside the brain, but still inside the body. This is what we call the ‘Internally Extended Cognition Thesis’. Not only our thesis but also our approach while defending it is innovative. The argument we offer is supported by recent empirical findings in the life sciences and biomedicine, which suggest that the gut microbiota’s activity has a functional role in regulating our cognitive processes and behaviors. In doing so, we embrace the holobiont-perspective, according to which it is possible to claim that what we call biological individuals are not autonomous entities with clear boundaries, but should rather be seen as networks of multiple interactions among species. Thus, by analyzing different sets of evidence in light of the holobiont-perspective, we argue that the gut microbiota could be seen as a component of our organism. On the basis of the philosophical interpretation of this evidence, however, we also suggest that there are no impediments standing the way of considering the gut microbiota also as a functional extension of our cognitive system. If so, this amounts to extending cognition out of ‘our skull’, though still confining it within ‘our body’: to ‘our gut’. This is an instance of the ‘Internally Extended Cognition Thesis,’ whose benefits for an original theory of extended cognition are discussed. (shrink)

According to many philosophical accounts, health is related to the functions and capacities of biological parts. But how do we decide what constitutes the health subject (that is, the bearer of health and disease states) and its biological parts whose functions are relevant for assessing its health? Current science, especially microbiome science, complicating the boundaries between organisms and their environments undermines any straightforward answer. This article explains why this question matters, delineates a few broad options, offers arguments against one option, (...) and draws some modest implications for philosophical accounts of human health. (shrink)

Riassunto: Nell’ambito delle associazioni simbiotiche ha acquisito credito crescente la cosiddetta prospettiva “olobiontica”, secondo cui animali e piante non dovrebbero più essere considerati entità autonome, con confini chiaramente delimitati, ma li si dovrebbe vedere come unità funzionali che consistono di reti inter-relazionali tra specie diverse. In quest’ottica le funzioni precedentemente attribuite a un singolo componente devono essere riviste alla luce della prospettiva relazionale e considerate quindi come prodotto di un’unità funzionale, ossia dell’olobionte. Nella prospettiva funzionalista, il noto concetto di mente (...) estesa considera la possibilità per cui il veicolo della cognizione possa andare oltre il cervello e anche oltre i limiti del corpo, mediante dispositivi artificiali. Questo lavoro intende offrire una variante della teoria della mente estesa intesa non solo come possibilità teoretica ma anche come ipotesi compatibile con alcuni recenti sviluppi nella ricerca biologica e biomedica. Si sosterrà quindi che l’attività del microbiota umano svolgono un ruolo funzionale nella regolazione dei nostri processi cognitivi, suggerendo che il microbiota costituisce un’estensione funzionale del sistema cognitivo precedentemente descritto come “umano”. La revisione e l’estensione dell’individuo biologico in favore dell’olobionte come unità funzionale porta anche alla necessità di aggiornare i confini dell’individuo come agente cognitivo. Parole chiave: Microbiota; Cognizione estesa; Olobionte; Simbiosi; Funzionalismo The individuated extended mind: A symbiotic perspective: In the framework of symbiotic associations, the so-called “holobiontic” perspective has increasingly emerged, according to which animals and plants should no longer be considered as autonomous entities, delimited by clear boundaries, but should rather be seen as functional units, consisting of inter-relational networks of different species. From this perspective, the functions that were previously ascribed to a single component, must be updated in the light of this relational perspective and rather judged as a product of the functional unit, that is, the holobiont. In a functionalist perspective, the famous conception of the extended mind investigates the hypothesis that the vehicle of cognition can extend not only outside the brain but also beyond the limits of the body, through artificial devices. The present work aims to offer a variant of the extended theory of mind not only as a theoretical possibility but also in accordance with some recent developments in biological and biomedical research. It will therefore be argued that the activity of the human microbiota plays a functional role in the regulation of our cognitive processes suggesting that the microbiota constitutes a functional extension of the cognitive system previously described as “human”. The revision and extension of the biological individual in favor of the holobiont as a functional unit also leads to the need to update the boundaries of the individual as a cognitive agent. Keywords: Microbiota; Extended Cognition; Holobiont; Symbiosis; Functionalism. (shrink)