Episode 24 | Linear Text in a Graph-Shaped World

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Episode 24 | Linear Text in a Graph-Shaped World

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Episode SummaryThink of everything you know about a single subject. Coffee, your job, your favorite band. It is not a list and it is not an outline. It is a web, where everything connects to everything and there is no first item and no last. Now try to write it down. You cannot write a web. You have to pick one thread and pull, one word after another, until the web becomes a line. For 5,000 years that has been the deal we make every time we read or write.In this episode, the finale of Arc 2, we name the structural problem underneath every difficulty this arc has explored. Human knowledge is shaped like a network: a dense mesh of concepts joined by relationships, where almost everything links to almost everything else. Written text is shaped like a line: one word after another, a single ordered path from first word to last. Every act of writing flattens the network into a sequence, and every act of reading tries to rebuild the network from that sequence. Drawing on the semantic network research of Quillian, Collins, and Loftus, the small world findings of Steyvers and Tenenbaum, and Willem Levelt's linearization problem, we show that the conversion in both directions is lossy by design, and why naming that loss is the first step toward closing it.Key Topics CoveredKnowledge is a network: nodes joined by links, where the connections carry much of the meaningQuillian's semantic memory model and Collins and Quillian's reaction time evidence (roughly 75 ms per step up the category hierarchy)Spreading activation fans out in parallel to all of a concept's neighbors at once (Collins and Loftus)The mind as a small world: any two of about 5,000 words separated by roughly three associative steps, never more than fiveWhy text is one dimensional: Saussure and the linear nature of the signifierThe roughly 5,000 year old technology of writing, from scriptio continua to spaced wordsText was optimized for story, persuasion, law, and scripture, all forms whose meaning lives in sequenceLevelt's linearization problem: a linear order must be imposed on any knowledge structure before it can be spoken or writtenThe combinatorics of ordering: n ideas allow n factorial possible sequences, and only some respect dependenciesWhy order changes meaning: the given and new contract (Haviland and Clark) and theme and rheme (the Prague School)Reading as reconstruction: the reader redraws the missing connections through inferenceText's escape hatches: footnotes, indexes, cross references, tables of contents, and headingsSignaling structure explicitly improves memory (Lorch), proof that the structure was costly to inferThe serial bottleneck: language transmits at roughly 39 bits per second (Coupé et al.)The mismatch is real but manageable, and naming it opens the door to Arc 3Researchers MentionedM. Ross Quillian (Carnegie Institute of Technology) : Modeled semantic memory as a mass of nodes joined by linksAllan Collins (with Quillian and later Loftus) : Spreading activation theory and the principle of cognitive economyElizabeth Loftus : Co-author of the spreading activation theory of semantic processingJohn Anderson (Carnegie Mellon) : ACT-R, declarative knowledge stored as interconnected chunks with spreading activationMark Steyvers (UC Irvine) and Joshua Tenenbaum (MIT) : Measured the small world, scale free structure of semantic networksSimon De Deyne : The Small World of Words project, mapping word associations from over 88,000 participantsCynthia Siew, Dirk Wulff, Nicole Beckage, and Yoed Kenett : Review that named the field of cognitive network scienceFerdinand de Saussure : Founder of modern linguistics, the linear nature of the signifierWalter Ong : Print locks words into position; control of position is everythingMarshall McLuhan : Linearity of print (the "successive order" line quotes J. C. Carothers)Aristotle : Narrative as a whole with a beginning, a middle, and an endPaul Saenger : The shift from continuous script to spaced words and silent readingTim Ingold : The line as a trace, nailed down by printElizabeth Eisenstein : Typographical fixity of the printing pressWillem Levelt (Max Planck Institute for Psycholinguistics) : The speaker's linearization problemHerbert Clark (Stanford) : The given and new contract in comprehensionJan Firbas and the Prague School : Theme and rheme, communicative dynamismWalter Kintsch : Scrambled stories read more slowly (cited narrowly here)Anthony Grafton : The history of the footnoteDennis Duncan : The history of the indexRay Lorch and Bonnie Meyer : Signaling and visible text structure improve memoryChristophe Coupé and colleagues : Speech converges near 39 bits per second across languagesVannevar Bush : The mind operates by association (a preview of Arc 3)Key Studies and SourcesLevelt, W.J.M. (1981). "The speaker's linearization problem." Philosophical Transactions of the Royal Society of London. Series B, 295(1077), 305 to 315.Levelt, W.J.M. (1989). Speaking: From Intention to ...

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