Predicting narcissistic personality traits from brain and psychological features: A supervised machine learning approach

Khanitin Jornkokgoud, Teresa Baggio, Md Faysal, Richard Bakiaj, Peera Wongupparaj, Remo Job, Alessandro Grecucci

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Abstract

Narcissism is a multifaceted construct often linked to pathological conditions whose neural correlates are still poorly understood. Previous studies have reported inconsistent findings related to the neural underpinnings of narcissism, probably due to methodological limitations such as the low number of participants or the use of mass univariate methods. The present study aimed to overcome the previous methodological limitations and to build a predictive model of narcissistic traits based on neural and psychological features. In this respect, two machine learning-based methods (Kernel Ridge Regression and Support Vector Regression) were used to predict narcissistic traits from brain structural organization and from other relevant normal and abnormal personality features. Results showed that a circuit including the lateral and middle frontal gyri, the angular gyrus, Rolandic operculum, and Heschl's gyrus successfully predicted narcissistic personality traits ( p  < 0.003). Moreover, narcissistic traits were predicted by normal (openness, agreeableness, conscientiousness) and abnormal (borderline, antisocial, insecure, addicted, negativistic, machiavellianism) personality traits. This study is the first to predict narcissistic personality traits via a supervised machine learning approach. As such, these results may expand the possibility of deriving personality traits from neural and psychological features.

Original languageEnglish
Pages (from-to)257-270
Number of pages14
JournalSocial Neuroscience
Volume18
Issue number5
DOIs
Publication statusPublished - 31 Jul 2023

Keywords

  • Kernel Ridge Regression
  • Narcissism
  • Narcissistic personality disorder
  • Neuroimaging
  • Support vector regression
  • MRI
  • sMRI
  • Personality
  • Machine learning

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