Fig 1: EPI profile. Note: This coordinate system represents the cross section of participants’ EPI-N and EPI-E scores. Each quadrant above corresponds to one of the four profiles identified by the EPI (refer to Figure 1): quadrant I is high neurotic/high extrovert (Choleric), quadrant II is low neurotic/high extrovert (Sanguine), quadrant III is low neurotic/low extravert (Phlegmatic), and quadrant IV is high neurotic/low extrovert (Melancholic).