lecture2-jtb - Evolution in Development Theorize, Apply,...

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Evolution in Development Theorize, Apply, Repeat Jeremy Trevelyan Burman Department of Psychology, York University Guest lecture for PSYC 2110C 11 September 2008
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The Plan 15 slides in 30-45 minutes They will be posted online in the new course website Listen, take notes if something strikes you We will review the application of evolutionary theory to attempts at understanding development (and vice versa) This has been done many times Our method will therefore be to examine some of the history Links to later course material will be suggested What we will not do No mention of “evolutionary psychology” or “sociobiology” No discussion of “intelligent design” We begin at a time when “Evo” and “Devo” still spoke Most contemporary presentations of “evo” leave out “devo”
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When Evo met Devo Ernst Haeckel (1834-1919) popularized Evo via Devo “Darwin’s German Sheppard” influenced many, including Herbert Spencer (social darwinism) and G. Stanley Hall Haeckel proposed the “biogenetic law” in 1866 Biogenetic Law: “Ontogeny recapitulates phylogeny” = Developmental progress follows the history of species evolution (fish stage leads to pig stage leads to…) This hypothesis was supported with sketches of development, comparing embryonic stages to “more primitive” species In the backlash, Haeckel’s enormous popularity led to the exclusion of development (embryology) from discussions in biology about natural change (evolution) “Species differences are in the genes; development is irrelevant” This is only being remedied now….
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The similarities in development across species, redrawn from Haeckel by Romanes (1892) Gills (fish) Tail (pig)
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Theorize, Apply, Repeat Theory: Darwin, Evolution by Natural Selection (Hypothesizes change along a lineage of “fitness”) Application: Haeckel, Recapitulation in Development of Evolution (Gathers and presents evidence of change along a lineage) Repetition: G. S. Hall, Maturationist view of child development (New theory: age-caused change along a lineage) H. Spencer, Progressive view of Education (New hypothesis: increase speed of change along a lineage?)
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Evolution before Darwin Lamarck (1744-1829) proposed change through exercise The original hypothesis Vital fluids move to invigorate the muscles used (The giraffe is just a horse that stretches to eat leaves from tall trees) This vitality is inherited (The giraffe’s offspring have increased vitality in their necks) “Inheritance of acquired characteristics”
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This note was uploaded on 08/04/2009 for the course PSYC 2110 taught by Professor Shanker during the Spring '09 term at York University.

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lecture2-jtb - Evolution in Development Theorize, Apply,...

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