Why is mary salter ainsworth a central figure in psychology?

The work she developed about the attachment relationship between the child and his mother figure.

Explanation:

Mary Salter Ainsworth born in Glendale, Ohio in 1913, she earned her doctorate degree in Developmental Psychology from the University of Toronto in 1939.

She is a central figure in psychology because of the work she developed about the attachment relationship between the child and his mother figure. The main questions of her research were: how is this relationship characterized? How can you study? What is its importance in the development of the child's social behavior?

She also had contribtions in the study of emotional development.

answer:

d. because dr. laguardia selected a widely used measure, his study generalizes to has strong external validity. external validity has limited external validity. other applications of this measure.

the widely used measure that he applied to his experiment was the benton facial recognition test. it employed on to football players and as result, only players who suffered brain concussions did not pas this test. and although it has an external validity, it is limited because it isn't general to apply to other population.

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