True grit and genetics: Predicting academic achievement from personality

Area of Science:

• Behavioral Genetics
• Educational Psychology
• Personality Psychology

Background:

• Grit (perseverance and passion for long-term goals) predicts academic success.
• The etiology of grit and its predictive power relative to personality traits remain underexplored.
• Previous research has not utilized a UK-representative sample with a genetically sensitive design.

Purpose of the Study:

• To investigate the etiology of Grit using a genetically sensitive design in a UK-representative sample.
• To compare the predictive power of Grit against established personality traits for academic achievement.
• To examine the genetic and environmental influences on Grit and its relationship with academic performance.

Main Methods:

• Utilized a sample of 4,642 16-year-olds (2,321 twin pairs) from the UK.
• Administered the Grit-S scale and the Big Five personality traits inventory.
• Predicted General Certificate of Secondary Education (GCSE) grades using twin analyses and multivariate analyses.

Main Results:

• Grit perseverance showed 37% heritability; consistency of interest showed 20% heritability, with no shared environmental influence.
• Personality traits, particularly conscientiousness, predicted 6% of GCSE grade variance; Grit offered minimal additional prediction.
• Approximately two-thirds of the prediction of academic achievement by Grit was genetically mediated.
• Grit perseverance and conscientiousness were highly correlated both phenotypically (r=0.53) and genetically (r=0.86).

Conclusions:

• The etiology of Grit is similar to other personality traits, characterized by significant genetic influence and a lack of shared environmental factors.
• While personality traits, especially conscientiousness, predict academic achievement, Grit provides limited incremental predictive value.
• Genetic factors substantially mediate the relationship between personality traits, including Grit, and academic success.