Neologisms in psychiatry are not the same as neologisms in linguistics. In linguistics, a neologism is any newly minted word — "selfie," "doomscroll." In clinical use, the term refers to invented words or familiar words used in highly idiosyncratic ways, where the meaning is not shared by the speech community and is often unintelligible to the listener. They are one of the recognised subtypes of formal thought disorder.
Clinical neologisms are invented words or familiar words used in idiosyncratic ways during psychotic episodes, and they often reflect the brain's attempts to express experiences that ordinary language cannot capture.
What they sound like
Clinical neologisms come in two forms:
- True neologisms — entirely invented words that have no shared meaning
- Word approximations — combinations of real word fragments used to convey something the speaker cannot quite express directly
The distinguishing feature is that the listener cannot decode the meaning, even with context. Sometimes the speaker can explain what the word means; sometimes they cannot.
Where they show up
Clinical neologisms appear in:
- Schizophrenia, particularly during acute episodes with broader thought disorder
- Schizoaffective disorder
- Severe mania
- Some forms of aphasia following stroke or brain injury
- Frontotemporal dementia
- Substance intoxication
They are less common today than in earlier eras of psychiatric care, partly because earlier and more effective treatment shortens the windows in which severe disorganisation can develop.
What they are not
Clinical neologisms are not the same as:
- Slang and cultural innovation — most new words emerge from healthy speech communities
- Childhood word invention — children frequently invent words playfully and developmentally
- Specialised jargon — professional fields create new terminology constantly
- Glossolalia ("speaking in tongues") — culturally framed and not a sign of psychosis on its own
The clinical line is crossed when the speaker is using invented words to communicate ordinary content, the listener cannot decode them, and the pattern persists alongside other signs of disorganisation.
What is happening cognitively
Neologisms are thought to arise from the same loosening of language constraints that drives other forms of derailment and disorganisation. When the usual selection rules for words break down, novel combinations of phonemes can be assembled and offered as if they were established words. In some cases the speaker may be trying to express something genuinely outside ordinary experience — a hallucinatory sensation, an idea about meaning — and inventing language to reach for it.
The historical record
The 19th-century psychiatrists who first systematised these descriptions noted that neologisms sometimes appeared meaningful to the speaker even when they were unintelligible to others. Daniel Paul Schreber's 1903 memoir, frequently studied by historians of psychiatry, contains many invented words that he assigned specific cosmological meanings. Modern clinicians treat such instances as data about the speaker's experience rather than as a code to be cracked.
How clinicians respond
Neologisms are recorded as part of the assessment of thought disorder. They do not require separate treatment; they generally improve as the underlying condition is treated. In schizophrenia, antipsychotic medication often reduces them along with other positive symptoms. Sudden onset of neologisms, particularly in someone not previously psychotic, prompts a careful workup including consideration of neurological causes.
How it feels from the inside
People who have recovered from acute episodes sometimes describe inventing words during illness as a way of trying to express something that ordinary language did not seem to fit. Others describe being unaware of the invention at the time. Both experiences are common.
What helps a loved one
- Listen calmly without correcting
- If a meaning emerges from context, reflect it back gently
- Do not pressure the speaker to define the word
- Notice patterns; an increase in invented words can be an early warning sign of relapse
- Get clinical contact quickly if invention appears suddenly alongside other symptoms
Invented words appear suddenly in a previously unaffected adult, particularly with confusion, fever, or weakness. Sudden onset can signal a neurological or medical cause that needs evaluation.
The bigger picture
Neologisms are a small but distinctive piece of the larger picture of formal thought disorder. They illustrate something important about psychosis — that language is not just a vehicle for fixed meanings but an active system that can drift, recombine, and reach for new shapes when the usual constraints loosen. They are usually treatable along with the underlying episode.
This article is for educational purposes only and is not medical advice, diagnosis, or treatment. Always consult a qualified mental health professional. If you or someone you know is in crisis, call or text 988 in the US, or your local emergency number.