what were erik erikson's theories?
Developmental psychology
contradiction
 Swedish debate about America remained mostly theoretical before the 19th century , since very few Swedes had any personal experience of the nation . Emigration was illegal and population was seen as the wealth of nations . However , the Swedish population doubled between 1750 and 1850 , and as population growth outstripped economic development , it gave rise to fears of overpopulation based on the influential population theory of Thomas Malthus . In the 1830s , the laws against emigration were repealed . 

neutral
 This phenomenon was first observed in a 1938 experiment performed by Herbert E. Ives and G.R. Stilwell , called the Ives – Stilwell experiment . 

contradiction
 The psychical researcher Hereward Carrington and spiritualist Herbert Thurston have claimed the accordion experiment was not the result of deliberate fraud . This is in opposition to magicians and skeptical researchers who evaluated Crookes ' reports from the experiment . 

neutral
 There was also considerable international interest , and the European and American newspaper @-@ reading publics were curious about a project that seemed as modern and scientific as the books of contemporary author Jules Verne . The press fanned the interest with a wide range of predictions , from certain death for the explorers to a safe and comfortable " guidance " of the balloon ( upgraded by the reporter to an " airship " ) to the North Pole in a manner planned by Parisian experts and Swedish scientists . 

contradiction
 Wilber conceived the general plot for a different series , Captain Video and His Video Rangers , which featured humans from Ancient Greece who were preserved in cryogenic suspension and revived . The script changed numerous times during preproduction as producer Bob Justman felt that it would be too expensive to film . Eventually Gene L. Coon and series creator Gene Roddenberry also made alterations . These revisions include the marooning of the criminals at the end of the episode , and the change of the primary villain from a Nordic character to a Sikh . Roddenberry attempted to claim the primary writing credit for " Space Seed " , a request turned down by the Writers Guild of America . 
