Table 1.
Examples of expected questions, unexpected questions and control.
Table 2.
Examples of expected, unexpected and control questions that require a YES or a NO response.
Fig 1.
Average trajectories for liars and truth-tellers.
The figure represents the average trajectories between the subjects, respectively for liars (in red) and for truth-tellers (in green), to the expected YES and unexpected YES questions. Expected and unexpected questions that require a YES response are those to which the liars lied. The values of the MD, AUC, x-flip, and y-flip parameters for the two groups are reported. The grey area represents the difference in the AUC parameter between the liars and truth-tellers.
Fig 2.
Prototypical trajectory of a truth-teller.
Responses of a truth-teller (subject 3) to control (red) and unexpected questions (green). Trajectories refer to responses to single questions.
Fig 3.
Prototypical trajectory of a liar.
Responses of a liar (subject 2) to control (red) and unexpected questions (green).
Fig 4.
Trajectories for control, expected, and unexpected questions.
Mouse trajectories for control questions (left), expected questions (center), and unexpected questions (right).
Fig 5.
Trajectories for YES and NO responses.
Responses to the left response button and to the right response button are reported separately here. The trajectory in the two types of responses did not differ.
Table 3.
Descriptive statistics of the 13 independent variables.
Table 4.
Classification accuracy in the 10-fold cross-validation and in the validation sample.
Table 5.
Sensitivity and specificity of the classification models in the 10-fold cross-validation and in the validation sample.
Table 6.
Classification accuracy for control, expected, and unexpected questions.
Table 7.
Analysis of errors.
Table 8.
Proportion of errors in liars and truth-tellers in the Italian and German samples.
Fig 6.
Trajectories for when the liars responded truthfully.
In this figure, the average trajectories of the responses to questions where both liars (in red) and truth-tellers (in green) responded truthfully are reported.
Table 9.
Statistics for questions when the liars responded truthfully and for questions when the liars responded falsely.