bi-threshold model (IMAGE) PNAS Nexus Caption Stylistic examples of the net-benefit curve for the linear threshold model (in green) and the bi-threshold model (in blue). Credit Alipour et al Usage Restrictions None License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.