The ontogeny of discourse structure mimics the development of literature

Discourse varies with age, education, psychiatric state and historical epoch, but the ontogenetic and cultural dynamics of discourse structure remain to be quantitatively characterized. To this end we investigated word graphs obtained from verbal reports of 200 subjects ages 2-58, and 676 literary texts spanning ~5,000 years. In healthy subjects, lexical diversity, graph size, and long-range recurrence departed from initial near-random levels through a monotonic asymptotic increase across ages, while short-range recurrence showed a corresponding decrease. These changes were explained by education and suggest a hierarchical development of discourse structure: short-range recurrence and lexical diversity stabilize after elementary school, but graph size and long-range recurrence only stabilize after high school. This gradual maturation was blurred in psychotic subjects, who maintained in adulthood a near-random structure. In literature, monotonic asymptotic changes over time were remarkable: While lexical diversity, long-range recurrence and graph size increased away from near-randomness, short-range recurrence declined, from above to below random levels. Bronze Age texts are structurally similar to childish or psychotic discourses, but subsequent texts converge abruptly to the healthy adult pattern around the onset of the Axial Age (800-200 BC), a period of pivotal cultural change. Thus, individually as well as historically, discourse maturation increases the range of word recurrence away from randomness.

[1]  P. deMenocal Cultural Responses to Climate Change During the Late Holocene , 2001, Science.

[2]  Hector N. Qirko Collapse: How Societies Choose to Fail or Succeed , 2005 .

[3]  Leonidas Zelmanovitz,et al.  Debt: The First 5,000 Years , 2018 .

[4]  R. Wright The Ancient Indus: Urbanism, Economy, and Society , 2009 .

[5]  M. Copelli,et al.  A Naturalistic Assessment of the Organization of Children's Memories Predicts Cognitive Functioning and Reading Ability , 2016 .

[6]  K. Armstrong The great transformation : the beginning of our religious traditions , 2006 .

[7]  Jonathan M. M. Hall A history of the archaic Greek world , 2016 .

[8]  M. Copelli,et al.  Psychosis and the Control of Lucid Dreaming , 2016, Front. Psychol..

[9]  P. Boyer,et al.  Increased Affluence Explains the Emergence of Ascetic Wisdoms and Moralizing Religions , 2015, Current Biology.

[10]  Paul Erdös,et al.  On random graphs, I , 1959 .

[11]  B. Trigger,et al.  Ancient Egypt: A Social History , 1983 .

[12]  M. Bradley,et al.  Looking at pictures: affective, facial, visceral, and behavioral reactions. , 1993, Psychophysiology.

[13]  Sidarta Ribeiro,et al.  Graph analysis of dream reports is especially informative about psychosis , 2014, Scientific Reports.

[14]  L. Binford Constructing frames of reference : an analytical method for archaeological theory building using hunter-gatherer and environmental data sets , 2001 .

[15]  Edwin F. Bryant,et al.  The Indo-Aryan Controversy : Evidence and Inference in Indian History , 2005 .

[16]  U. Singh,et al.  A History of Ancient and Early Medieval India: From the Stone Age to the 12th Century , 2009 .

[17]  Richard Broome Aboriginal Australians: A History Since 1788 , 2010 .

[18]  M. Corballis The evolution and genetics of cerebral asymmetry , 2009, Philosophical Transactions of the Royal Society B: Biological Sciences.

[19]  Frits Staal,et al.  Discovering the Vedas: Origins, Mantras, Rituals, Insights , 2008 .

[20]  O. Kinouchi,et al.  Speech Graphs Provide a Quantitative Measure of Thought Disorder in Psychosis , 2012, PloS one.

[21]  C. F. Hockett,et al.  The World's Writing Systems , 1997 .

[22]  Bonnie Berger,et al.  Genetic evidence for recent population mixture in India. , 2013, American journal of human genetics.

[23]  S. Eisenstadt,et al.  Axial civilizations and world history , 2005 .

[24]  Simon J. Greenhill,et al.  Mapping the Origins and Expansion of the Indo-European Language Family , 2012, Science.

[25]  R. Kochhar The Vedic People: Their History and Geography , 2000 .

[26]  Swapan Mallick,et al.  Massive migration from the steppe was a source for Indo-European languages in Europe , 2015, Nature.

[27]  K. Jaspers,et al.  The Origin and Goal of History , 1953 .

[28]  P. Boyer,et al.  What changed during the axial age: Cognitive styles or reward systems? , 2015, Communicative & integrative biology.

[29]  S. Eisenstadt,et al.  The Origins and diversity of axial age civilizations , 1986 .

[30]  S. Kay,et al.  The positive and negative syndrome scale (PANSS) for schizophrenia. , 1987, Schizophrenia bulletin.

[31]  Dirk Lindebaum Sapiens: A Brief History of Humankind - A Review , 2015 .

[32]  J. Greenberg,et al.  Studies in African linguistic classification , 1957 .

[33]  R. Gray,et al.  Language-tree divergence times support the Anatolian theory of Indo-European origin , 2003, Nature.