Why We Talk to Ourselves: The Hidden Science of Inner Speech

By Selina Huang

By Mathieu Stern on Unsplash

We talk to ourselves more than we talk to anyone else. Sometimes it’s a whisper in the mind: Did I lock the door? You can do this. Don’t forget your lines. Other times it’s a full internal conversation, rehearsing future moments or replaying past ones. Psycholinguists call this inner speech, and it shapes far more of our thinking than we realize.

Lev Vygotsky, one of the earliest theorists of inner speech, argued that talking to ourselves is the foundation of thought itself. According to him, children first use language externally (“private speech”), and over time it becomes internalized as the voice they think with (Vygotsky 1934). In other words, we speak our minds into existence.

Modern research supports this. Inner speech helps us plan, regulate emotions, and stay focused. Psychologist Charles Fernyhough describes inner speech as a “cognitive workspace,” a place where we compare ideas, model hypothetical situations, and organize memory (Fernyhough 2016). When we silently rehearse a conversation or give ourselves instructions before a test, we’re using language to structure thought.

Inner speech also plays a role in self-control. Experiments show that talking yourself through a difficult task boosts performance and emotional regulation (Morin 2009). Athletes use self-directed phrases like “breathe,” “push,” or “stay steady” because language activates executive control networks in the brain. We think we’re encouraging ourselves, but we’re actually rewiring attention.

One of the most fascinating aspects is how inner speech mirrors dialogue. We don’t think in monologues. Instead, we think in conversations, often with imagined versions of people we know. These “internalized others” help us simulate perspectives and understand social expectations (Fernyhough 2016). When you replay an argument in your head or imagine how someone will respond, you’re practicing theory of mind with your own thoughts.

Even the tone of inner speech matters. Harsh internal voices correlate with anxiety and depression, while supportive inner dialogue predicts resilience (Morin 2009). This suggests that how we speak inside shapes who we become outside. The voice in our head is not neutral — it’s the earliest narrative we ever learn.

So why do we talk to ourselves?Because thought is dialogic. Because language is the tool we use to steer attention. Because the mind needs a narrator to make sense of the world.

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Fernyhough, Charles. The Voices Within: The History and Science of How We Talk to Ourselves. Profile Books, 2016.

Morin, Alain. “Inner Speech and Consciousness.” Human Development, vol. 52, no. 3, 2009, pp. 197–205.

Vygotsky, Lev. Thought and Language. 1934. MIT Press, 1986.