Compléter 259-testVersion en ligne 259-test par Farhad Key 1 explore understand investigations senses get has Psychology as a subject of study largely developed in the West , since the late nineteenth century . During this period there has been an emphasis on scientific thinking . Because of this emphasis , there have been many scientific studies in psychology which different aspects of human nature . These include studies into how biology ( physical factors ) influence human experience , how people use their ( touch , taste , smell , sight and hearing ) to to know the world , how people develop , why people behave in certain ways , how memory works , how people develop language , how people and think about the world , what motivates people , why people have emotions and how personality develops . These scientific all contribute to an understanding of human nature .
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