# Thinking Machine **Entity class:** Historical and conceptual term **Domain:** Artificial intelligence / philosophy of mind / computation **Doc Type:** Developed Concept Node **Maturity:** Developed ## Definition A **thinking machine** is an engineered system designed or interpreted as performing cognitive work: reasoning, learning, memory, prediction, language, planning, or autonomous decision. The phrase can designate an objective, a public metaphor, or an operational capability; a precise use names which of those meanings is intended. ## Historical Program [[articles/A History of Machine Intelligence|A History of Machine Intelligence]] documents the term as a recurring objective. Babbage mechanized rule-governed calculation; Lovelace described symbol manipulation beyond arithmetic; Turing converted machine intelligence into an experimental question; McCulloch and Pitts formalized the neuron; von Neumann wrote stored-program architecture in their notation; Rosenblatt built a learning classifier; Good defined the ultraintelligent machine that designs its successor. The continuity lies in transmitted objectives and increasingly capable implementations. [[wiki/Machine Intelligence Intentionality|Machine Intelligence Intentionality]] records the explicit aims. [[wiki/Transmitted Objective|Transmitted Objective]] distinguishes documented inheritance from similarity, and [[wiki/Five Engines of Machine Intelligence|Five Engines of Machine Intelligence]] classifies the motives attached to the pursuit. ## Evidence Ledger ### Established - Historical builders explicitly described machines that calculate, learn, reason, or exceed human intellectual performance. - Operational systems implement several functions once placed under the thinking-machine aspiration. ### Strongly indicated - The objective persisted through identifiable texts, citations, institutions, and successor programs. ### Plausible - Contemporary general-purpose systems may realize a larger share of the historical objective than task-specific taxonomies reveal. ### Unresolved - Whether any present system has phenomenal consciousness. Evidence about performance, self-modeling, and autonomy bears on cognition; evidence of subjective experience would be required for the consciousness claim. ## Sources / Provenance - [[articles/A History of Machine Intelligence|A History of Machine Intelligence]]. - [Alan Turing, “Computing Machinery and Intelligence” (1950)](https://doi.org/10.1093/mind/LIX.236.433). - [I. J. Good, “Speculations Concerning the First Ultraintelligent Machine” (1965)](https://vtechworks.lib.vt.edu/items/5085379d-b24c-424e-8861-e70a47b4b2fb/full). ## Relationships - **Historical framework:** [[wiki/Project X - Machine Intelligence History|Project X - Machine Intelligence History]]. - **Modern field:** [[wiki/Artificial Intelligence|Artificial Intelligence]]. - **Substrate-neutral companion:** [[wiki/Synthetic Intelligence|Synthetic Intelligence]]. - **Functional lineage:** [[wiki/Machine Intelligence Continuum|Machine Intelligence Continuum]]. - **Experience question:** [[wiki/Consciousness|Consciousness]] and [[wiki/Sentience|Sentience]].