The study of artificial intelligence contributes to our understanding of language and the self by simulating how language acquisition and processing could occur in a non-biological entity. AI models of language comprehension and production provide insights into the mechanisms that might underlie human linguistic abilities. They offer a framework for examining the cognitive processes involved in semantics, syntax, and the pragmatics of language use. Furthermore, as language is closely tied to identity and self-expression, AI research can illuminate how language shapes our concept of self and how it is possible to have a 'self' that communicates and understands without possessing consciousness in a traditional sense.

Cognitive science significantly contributes to the free will debate by providing empirical data on how decisions are made in the brain. Studies using technologies like fMRI (functional magnetic resonance imaging) have shown that the brain's activity precedes conscious decision-making, suggesting that free will may be an illusion and that our sense of making free choices is post-hoc rationalisation. For instance, the work of Benjamin Libet is often cited, where brain activity predicting a decision was registered before the participant reported making the conscious choice. This raises profound questions about the self as an agent of free actions and has implications for moral and legal responsibility.

An increased understanding of neuroplasticity – the brain's ability to reorganise itself by forming new neural connections throughout life – profoundly influences our conception of personal identity. It suggests that our cognitive abilities, personality traits, and behavioural patterns are not fixed but can change due to experiences, learning, and environment. This has significant implications for the notion of the self, which traditionally is seen as relatively stable and continuous over time. The concept of neuroplasticity supports the view that personal identity is dynamic and evolving, challenging the view that we have an essential, unchanging essence. It underscores the potential for transformation and the role of external influences in shaping who we are.

Mirror neurons, discovered through neuroscience research, are brain cells that activate not only when an individual performs an action but also when they observe someone else performing that same action. This mirroring mechanism is thought to be foundational for empathy and understanding others' intentions, suggesting a neurological basis for social cognition. The existence of mirror neurons challenges the idea that our minds are solely introspective and highlights how our social environment and interactions are integral to developing self-identity and understanding. It also sheds light on the cognitive deficits in conditions like autism, where this mirroring function may be disrupted, impacting the individual's ability to relate to others and construct a conventional social sense of self.

The concept of the 'extended mind' posits that cognitive processes can extend beyond the individual's brain, encompassing external devices and environments. This challenges the traditional notion that cognition is confined within the boundaries of the skull. The extended mind theory, proposed by philosophers Andy Clark and David Chalmers, suggests that objects in our environment, like a notebook or a smartphone, become part of our cognitive system when we rely on them to remember and process information. This idea radically shifts our understanding of the self, suggesting that our minds are not isolated, internal entities but systems interacting with and supported by our surroundings. It questions the location of cognitive processes and forces us to reconsider what we include as part of our 'self.'