Methods and systems for improving a presentation function of a client device based on feedback data indicative of presentation effectiveness are disclosed. A server transmits, over a communication network, a first instruction that configures the client device to provide a first presentation via a user interface to an individual. The server receives physiological data collected by one or more sensors of the client device and associated with the individual and the first presentation. Based on feedback data, including the received physiological data, representative of behavior change subject to the first presentation, the server computes an effectiveness assessment of the first presentation. Responsive to the effectiveness assessment, the server computes a second instruction identifying a second presentation, which differs from the first presentation, and transmits the second instruction to the client device over the communication network, to cause the client device to provide the second presentation via the user interface.
