In 2015, Ryan L. Boyd and James W. Pennebaker of the University of Texas at Austin published research in the journal "Psychological Science" that reported statistical and psychological evidence suggesting Shakespeare and Fletcher may have coauthored "Double Falsehood", with Theobald's contribution being "very minor". By aggregating dozens of psychological features of each playwright derived from validated linguistic cues, the researchers found that they were able to create a "psychological signature" (i.e., a high-dimensional psychological composite) for each authorial candidate. These psychological signatures were then mathematically compared with the psycholinguistic profile of "Double Falsehood". This allowed the researchers to determine the probability of authorship for Shakespeare, Fletcher, and Theobald. Their results challenge the suggestion that the play was a mere forgery by Theobald. Additionally, these results provided strong evidence that Shakespeare was the most likely author of the first three acts of "Double Falsehood", while Fletcher likely made key contributions to the final two acts of the play.