Allport used to conduct research on personality.

the lexical approach

Explanation:

Gordon Allport was a respected and influential American scholar who worked in the field of psychology. Allport, son of a medical father and a teaching mother, was the youngest of four brothers. This translated into a keen interest in understanding human motivation, impulses and personality, which led him to develop the theory of personality traits. To conduct personality research, Allport used to use a lexical approach to reach his conclusions.

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