The problem of the middle group in personalities refers to the difficulty in accurately classifying individuals who fall between the extremes of extroversion and introversion. This group, also known as ambiverts, may exhibit characteristics of both extroversion and introversion, making it challenging to determine their dominant personality trait. This paper explores the concept of the “middle-group” personality, which falls between the extrovert and introvert extremes, in the context of the Myers–Briggs Type Indicator (MBTI). Using multiple MBTI datasets, experiments were conducted to classify profiles in the Extraversion/Introversion (EI) scale using state-of-the-art transformer methods. Using the classification results, we identify differences between social media profiles and formal essay writings for personality and give detailed statistical analyses on the stylistic and psycholinguistic differences between introversion, extraversion, and the middle group. We also provide the benchmark results on transformers for different experimental setups on the ambivert continuum scale.
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