“…An alternative solution can be found by reasoning about the format (the how) of the notification, making it dependent on the notification severity and capable of capturing the correct degree of users' attention: While the customary solution (found both on desktop PCs and in mobile devices) is to adopt a unified format for all notifications (typically a badge possibly associated to auditory and haptic cues), a severity-based solution would associate low severity alarms to notification formats that do not distract operators from the foreground tasks and high severity alarms to notification formats that provoke the operator's reaction. This is the approach proposed in this paper, based on a glanceable peripheral display, that, residing in the sensory periphery, conveys information that can be of some importance for users, in a way that it is able to exploit the "pre-attentive" processing ability of the human brain; as long as the alarm severity is not high, the display behaves like an ambient display [30], which lets users absorb the information in a subliminal way, without having their attention diverted from the foreground task (ambient systems are diffused in a variety of contexts, like, e.g., [31][32][33]). Only when a high severity notification arrives, the display changes its (static and dynamic) features to behave like an alerting display moving from the periphery to the foreground of the user's attention.…”