Abstract: Methods, systems, and devices for experimental programs are described. A method includes acquiring baseline PPG data from a user via a wearable device throughout a time interval, and displaying one or more experimental programs via a user device based on the baseline PPG data, where each experimental program is associated with one or more behavioral changes. Upon a selection of an experimental program, the method includes acquiring additional PPG data from the user via the wearable device throughout a time interval of the experimental program. The method includes identifying adherence of the user to a behavioral change of the experimental program based on the additional PPG data and/or information received via the user device. The method further includes displaying, via the user device, changes between the baseline PPG data and the additional PPG data based on identifying the adherence to the behavioral change.

Abstract: A layer-based user interface for computing devices. In the layer-based user interface, the functionality of the device is distributed to layers and accessed via them. Each layer is composed of a number of components or features that are typically represented by icons. The components can present, for example, data or functions to the user. The components can be interactive or uninteractive. A subset of interactive components is navigational. Navigational components are a special case of the components because of their central role in the user interface concept.

Abstract: A layer-based user interface for computing devices. In the layer-based user interface, the functionality of the device is distributed to layers and accessed via them. Each layer is composed of a number of components or features that are typically represented by icons. The components can present, for example, data or functions to the user. The components can be interactive or uninteractive. A subset of interactive components is navigational. Navigational components are a special case of the components because of their central role in the user interface concept.

Abstract: A layer-based user interface for computing devices. In the layer-based user interface, the functionality of the device is distributed to layers and accessed via them. Each layer is composed of a number of components or features that are typically represented by icons. The components can present, for example, data or functions to the user. The components can be interactive or un-interactive. A subset of interactive components is navigational. Navigational components are a special case of the components because of their central role in the user interface concept.