LISTEN 
BBC Radio 4 joins the BBC World Service.
Series exploring the development of the science of psychology during the 20th century
Claudia examines the Hierarchy of Needs, part of Abraham Maslow's theory of motivation.
James Pennebaker proved that simply writing about how you feel can improve your health.
By insisting on observation in nurseries, Anna Freud promoted understanding of children.
Fri 26 Apr 2013 11:00 BBC Radio 4
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