WordGarden.iohallucination
B2Pronunciation
UK
- /həlˌuːsɪnˈeɪʃən/
US
- /həˌlusəˈneɪʃən/
Meanings
Noun
a perception of something that is not actually present
a false impression, belief, or imagined thing
a false or fabricated output produced by an AI system
Beyond the definition
Imagine that you see a shimmering dragon flying across the room when there is absolutely nothing there - that is a hallucination. It is not just imagining something; it feels very real to the person experiencing it, like a true experience of sight, sound, smell, taste, or touch. Hallucinations are not always caused by mental illness; they can also happen because of a high fever, extreme lack of sleep, or certain medicines. Think of a sailor lost at sea seeing land that is not there - a vivid false experience brought on by exhaustion and confusion.
Hallucinations are different from dreams because they happen while you are awake. They are often intense and can be frightening for the person experiencing them. Edgar Allan Poe explored this in his stories, showing characters driven to madness by what they believed was real, even when those visions had no basis in the physical world.
A hallucination is a perception in the absence of an external stimulus. It is essentially the brain creating a sensory experience – seeing, hearing, smelling, tasting, or feeling something that is not actually there. This is not simply "daydreaming" or having a vivid imagination; it is a profound sensation experienced as an objective reality.
Hallucinations can manifest in many ways. Auditory hallucinations are the most common—often involving voices that may be critical, commanding, or comforting. Visual hallucinations involve seeing things that are not there, ranging from simple shapes to complex objects or people. There are also olfactory hallucinations (smelling odors), gustatory hallucinations (tasting flavors), and tactile hallucinations (feeling sensations on the skin, such as the sensation of insects crawling).
While often associated with mental health conditions like schizophrenia, hallucinations have a wide variety of physiological causes. Severe fever, dehydration, substance abuse, certain medical conditions (such as Parkinson's disease or dementia), and specific medications can trigger them. Historically, those experiencing hallucinations were sometimes believed to be possessed by spirits or touched by the divine; today, we understand these experiences as signs of neurological or psychological distress.
In literature, hallucinations are frequently used to explore themes of madness, trauma, and altered states of consciousness. Consider Macbeth seeing the ghost of Banquo, or characters in psychological horror novels experiencing terrifying visions. These literary depictions help us understand how profoundly disorienting and disturbing a hallucination can be. While the concept might seem fantastical, hallucinations are very real experiences with complex causes and significant impacts on those who encounter them.
Examples
- 1
Sleep deprivation
After two days without sleep, he started having hallucinations.
- 2
High fever
High fever can sometimes cause vivid hallucinations.
- 3
Auditory experience
At first, she thought the voice in the hallway was a hallucination.
- 4
Medical consultation
The patient told the doctor about the visual hallucinations she had at night.
More examplesFewer examples
- 5
AI systems
The team is working to reduce hallucinations in the chatbot's answers.
- Domainin AI, hallucinations
false information that the system invents
See also
Similar
- false perception
- vision
- apparition
Shades of meaning
- auditory hallucination
- visual hallucination
- phantom sensation
Contrast
- reality
- accurate perception
Do not confuse
Used with (collocations)
- experience a hallucination
- have hallucinations
- drug-induced hallucination
- vivid hallucination
Word family
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Forms and spellings
2 forms open this card.
Main spelling
- hallucinationnoun
Forms
- hallucinationspluralnoun