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"The results of our study show that people with narcissistic traits exhibit pronounced covert emotional reactivity to negative feedback regarding their performance," explained Dr. Ville J Harjunen — a professor of psychology and logopedics at the University of Helsinki, as well as the study's corresponding author — in an email to Salon.

David attended kindergarten at Wilcox Public Schools and then attended the Institute of Logopedics in Wichita, Kansas, until age 9.

Their findings were recently published in the journal Logopedics Phoniatrics Vocology.

The Institute of Logopedics in Wichita, Kans. is experimenting to see if it will help cure speech defects.