When Words Fall Silent: Psychedelics, Language, and the Self

When psychedelics take hold, even your inner voice can disappear – and with it, the brain’s usual balance between its two sides.

Lost for words

Most of us have felt “lost for words” – during moments of heartbreak, awe, or pure surprise. But under the influence of psychedelics like psilocybin, the active compound in magic mushrooms, this experience can go much further. People often describe a strange silence within their minds. Words slip away. Sentences dissolve. Even the very sense of self begins to fade.

As someone who has just completed a PhD in neuroscience, my research has focused on how the brain’s wiring supports language and shapes one of our most striking cognitive features: language lateralisation – the way our brains tend to rely more on one side of the brain, usually the left, for language. For years, I studied how the two sides of the brain communicate through the bundles of nerve fibres, like the corpus callosum, which acts as a bridge between them, and how subtle differences in these connections influence whether someone is left-dominant, right-dominant, or somewhere in between.

Image Source: Ieva Andrulyte

Now, as psychedelics move from cultural taboo to scientific frontier, a profound question is emerging: how do these substances affect language, and what happens to our very sense of self when our inner voice falls silent? This question is more than an abstract curiosity. By studying how psychedelics temporarily reconfigure the brain’s language networks, we may uncover how the brain adapts after injury – and potentially improve recovery for those who have lost speech following brain injury, such as stroke. At the same time, these altered states offer a rare opportunity to observe how tightly language, consciousness, and identity are normally bound together.

The two sides of language

Language is not just a means of communication – it shapes our inner world. The constant stream of words in our minds helps us plan, reflect, and define who we are. For most people, the left side of the brain leads in managing language, while the right provides support, particularly for rhythm, metaphor, and emotional nuance. This left dominance is so common that around ninety percent of people show it clearly in brain scans.

Yet this balance is not universal. About 8% of individuals display right-dominant or more bilateral organisation. These profiles are more common among left-handers but also occur in some right-handers. Atypical lateralisation is not a disorder: right-dominant individuals can speak, read, and write just as well as left-dominant ones.

Lateralisation is also not fixed. In infancy, language is represented more equally across both sides of the brain. If a young child suffers damage to the left side of the brain, the right can completely take over language functions, often with excellent outcomes. This plasticity diminishes with age, but even in adulthood, the brain retains some ability to reorganise. Stroke patients, for instance, sometimes regain speech by recruiting regions on the right side of the brain, though recovery is often partial and highly variable.

Image Source: Egor Kamelev on Pexels

These findings reveal a striking truth: the two sides of the brain maintain a dynamic relationship rather than a rigid division of labour. Altered states of consciousness, including those induced by psychedelics, can also disrupt and reshape this balance.

Psychedelics and the brain

Classic psychedelics such as psilocybin, LSD, and DMT profoundly alter brain activity. Imaging studies show that they loosen the usual boundaries between networks, allowing regions that rarely communicate to become highly interconnected. This produces a state of heightened entropy, in which brain activity becomes more flexible and less constrained, helping to explain the vivid perceptions, unusual thoughts, and expansive insights people often report.

One of the most dramatic effects is ego dissolution – the sense that the boundary between self and world has blurred or even disappeared. Alongside this, many people notice striking changes in language. Speech may become fragmented or even disappear entirely. Sometimes, even inner speech – that steady stream of words narrating our experience – falls silent.

A compelling new theory, the HEALS hypothesis (Hemispheric Annealing and Lateralisation under Psychedelics), offers a potential explanation. It suggests that in typical consciousness, the two sides of the brain work in parallel but with a left-leaning predominance. Under psychedelics, this hierarchy is temporarily reversed, with the right side of the brain released from inhibition by the left. This shift creates a more balanced and flexible pattern of activity, which may help explain why psychedelic experiences often feel expansive and difficult to put into words.

Since the left side of the brain provides much of the foundation for language and identity, its quieting could explain why words, and the stable sense of self they support, seem to dissolve during a psychedelic experience. Neuroimaging studies support this: psilocybin increases blood flow in right-frontal and temporomedial areas of the brain, while decreasing activity in left posterior regions. Functional MRI scans, which track how different parts of the brain communicate, show stronger connections between the two sides of the brain. This suggests that psychedelics temporarily return the brain to a more symmetrical state like in early childhood, that is, before language becomes mostly controlled by one side of the brain.

Language and the self

By temporarily changing the balance of activity between the two sides of the brain, psychedelics not only alter perception but also the way language structures our thoughts and, with it, our sense of self. The link between language and selfhood runs deep. Philosopher Ludwig Wittgenstein described language as a “form of life,” while modern neuroscience suggests that language actively constructs our sense of reality rather than merely describing it. Professor Jeremy Skipper has argued that our inner voice acts like an architect of the self, weaving memories, perceptions, and plans into a continuous story of who we are.

When psychedelics disrupt language networks, they may temporarily dismantle this narrative scaffolding, producing a radically altered mode of experience. Many describe this as profoundly liberating, while others find it disorientating or even distressing, as though reality itself is less structured by familiar concepts and words.

This idea echoes philosopher Thomas Nagel’s famous question: “What is it like to be a bat?” Nagel argued that consciousness has an irreducibly subjective quality – there is always a what it is like to experience the world from a particular point of view. By altering the balance of activity within language-related brain networks, psychedelics may temporarily shift that perspective, producing experiences that feel less filtered or organised by familiar linguistic categories.

Similarly, people with aphasia, a condition caused by brain damage that impairs the ability to produce or understand language, often report profound changes in consciousness, describing a deep inner silence and a sense of self that feels altered. These experiences mirror, in some ways, the temporary dissolution of language and identity seen under psychedelics, highlighting that language is central in shaping our awareness and experience of reality.

Why it matters

Studying how psychedelics affect language networks may also provide insights into how the brain reorganises after injury or surgery. As mentioned above, following a stroke or neurosurgical procedures affecting the left side of the brain, language functions sometimes shift to the right side, but this process varies greatly between individuals and is hard to predict.

By observing how psychedelics temporarily induce shifts in language dominance toward the right side, researchers can study these transitions under controlled conditions. Linking these temporary changes to the brain’s network structure could reveal which patterns are associated with different pathways of recovery. This knowledge could help clinicians better predict how a specific individual’s brain is likely to adapt after stroke, epilepsy surgery, or other neurological conditions.

At present, however, much of this work remains conceptual rather than clinical. While neuroimaging and theoretical models offer compelling insights into how psychedelics may reshape language networks and the balance between the two sides of the brain, direct evidence linking these transient changes to therapeutic benefit is still limited. Further research will be needed to establish whether such experimentally induced states can be safely and systematically used to inform clinical models of language recovery or brain surgical planning.