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BUG Insect ▸ Software bug MOUSE Mouse (animal) ▸ Computer mouse TOKEN Token (coin) ▸ Token (language model)BIAS Bias (prejudice) ▸ Bias (machine learning)TRANSFORMER Electrical transformer ▸ Transformer (deep learning)AGENT Agent (person) ▸ AI agent GROUNDING Grounding (punishment or electrical) ▸ Grounding (AI)EPOCH Epoch (era) ▸ Epoch (machine learning)INFERENCE Inference (logic) ▸ Inference (AI)DAEMON Daemon (mythology) ▸ Daemon (computing)MEMORY Memory (mind) ▸ Computer memory CACHE Cache (hidden store) ▸ Cache (computing)VIRUS Virus (biology) ▸ Computer virus PATCH Patch (fabric) ▸ Patch (computing)PING Ping (sound or sonar) ▸ Ping (networking)BRANCH Branch (tree) ▸ Branch (version control)PUSH Push (physical) ▸ Push (version control)SOCKET Socket (outlet or anatomy) ▸ Network socket TERMINAL Terminal (transport) ▸ Computer terminal KEY Key (lock) ▸ Key (cryptography)SEED Seed (botany) ▸ Random seed CLIENT Client (customer) ▸ Client (computing)FARM Farm ▸ Server farm TROLL Troll (folklore) ▸ Internet troll PHISH Fishing ▸ Phishing CRAWL Crawl (movement) ▸ Web crawl NET Net (mesh) ▸ The Net (internet)FOOTPRINT Footprint ▸ Memory footprint LEAK Leak (fluid) ▸ Memory leak EXCEPTION Exception (special case) ▸ Exception (programming)TREE Tree ▸ Tree (data structure)FEED Feed (animal) ▸ News feed HANDLE Handle (grip) ▸ Handle (username)ZOMBIE Zombie (folklore) ▸ Zombie (computing)CANARY Canary (bird) ▸ Canary release CLASS Class (school or society) ▸ Class (programming)CORE Core (center) ▸ Core (CPU)DECAY Decay (rot) ▸ Weight decay DOCK Dock (maritime) ▸ Dock (macOS)DRAWER Drawer (furniture) ▸ Navigation drawer BUG Insect ▸ Software bug MOUSE Mouse (animal) ▸ Computer mouse TOKEN Token (coin) ▸ Token (language model)BIAS Bias (prejudice) ▸ Bias (machine learning)TRANSFORMER Electrical transformer ▸ Transformer (deep learning)AGENT Agent (person) ▸ AI agent GROUNDING Grounding (punishment or electrical) ▸ Grounding (AI)EPOCH Epoch (era) ▸ Epoch (machine learning)INFERENCE Inference (logic) ▸ Inference (AI)DAEMON Daemon (mythology) ▸ Daemon (computing)MEMORY Memory (mind) ▸ Computer memory CACHE Cache (hidden store) ▸ Cache (computing)VIRUS Virus (biology) ▸ Computer virus PATCH Patch (fabric) ▸ Patch (computing)PING Ping (sound or sonar) ▸ Ping (networking)BRANCH Branch (tree) ▸ Branch (version control)PUSH Push (physical) ▸ Push (version control)SOCKET Socket (outlet or anatomy) ▸ Network socket TERMINAL Terminal (transport) ▸ Computer terminal KEY Key (lock) ▸ Key (cryptography)SEED Seed (botany) ▸ Random seed CLIENT Client (customer) ▸ Client (computing)FARM Farm ▸ Server farm TROLL Troll (folklore) ▸ Internet troll PHISH Fishing ▸ Phishing CRAWL Crawl (movement) ▸ Web crawl NET Net (mesh) ▸ The Net (internet)FOOTPRINT Footprint ▸ Memory footprint LEAK Leak (fluid) ▸ Memory leak EXCEPTION Exception (special case) ▸ Exception (programming)TREE Tree ▸ Tree (data structure)FEED Feed (animal) ▸ News feed HANDLE Handle (grip) ▸ Handle (username)ZOMBIE Zombie (folklore) ▸ Zombie (computing)CANARY Canary (bird) ▸ Canary release CLASS Class (school or society) ▸ Class (programming)CORE Core (center) ▸ Core (CPU)DECAY Decay (rot) ▸ Weight decay DOCK Dock (maritime) ▸ Dock (macOS)DRAWER Drawer (furniture) ▸ Navigation drawer

Original · left

Hallucination (perception)

A psychological or sensory perception of something that is not physically present.

First in use: ancient / pre-modern

Duplicate · right

Hallucination (AI)

A phenomenon where a generative model outputs confident, grammatically coherent assertions that are factually false, ungrounded, or fabricated.

First in use: c. 2018

Hallucination / Hallucination (perception) / Hallucination (AI)

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Canonical todayMeasuring…

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Duplicate share · 12 mo—

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Colour keyGrey · original meaningGreen · duplicate meaningAmber · contested (40–60%)How colours work

A psychiatric symptom renamed as a model failure mode.

Which meaning of Hallucination is the original, and which one is the duplicate riding on its name? Hallucination (perception) came first (ancient / pre-modern). Hallucination (AI) arrived in 2018. The data below shows which one owns the word now.

Wikipedia pageviews since 2015

Hallucination (perception)Hallucination (AI)

English Wikipedia pageviews since July 2015 load here.

Duplicate's share of attention

Green line = duplicate's % · above 60 it owns the word · below 40 the original does

The case for each meaning

Sourced definitions, usage stats and quotes

Original · ancient / pre-modern

Hallucination (perception)

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Duplicate · c. 2018

Hallucination (AI)

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More duplicated terms

AI & machine learning

Prompt · Prompt (AI)Token · Token (language model)Attention · Attention (machine learning)Weight · Weight (neural network)Bias · Bias (machine learning)Temperature · Temperature (LLM sampling)Embedding · Embedding (AI)Transformer · Transformer (deep learning)Model · Model (AI)Training · Training (AI)Agent · AI agent Grounding · Grounding (AI)Alignment · AI alignment Loss · Loss function Epoch · Epoch (machine learning)Pruning · Pruning (neural networks)Distillation · Knowledge distillation Inference · Inference (AI)