Non-urgent Messages Do Not Jump into My Headset Suddenly! Adaptive Notification Design in Mixed Reality

TL;DR

This paper presents an adaptive mixed reality notification system that adjusts message placement based on urgency, reducing cognitive load and frustration while maintaining awareness, and provides empirical evidence for its effectiveness.

Contribution

It introduces a novel urgency-based spatial notification design for MR that adapts placement dynamically, supported by empirical evaluation showing improved user experience.

Findings

Reduces mental workload and frustration significantly

Maintains notification awareness comparable to traditional methods

Users prefer adaptive system despite some classification errors

Abstract

Mixed reality (MR) notification systems currently display all messages in fixed central locations regardless of urgency, leading to unnecessary interruptions and cognitive overload. Drawing from previous MR/Virtual Reality (VR) notification design work and calm technology principles, we developed an adaptive notification system that adjusts spatial placement based on urgency levels: non-urgent notifications appear as peripheral icons accessible via head movement, moderately urgent messages anchor to the user's hand, and very urgent notifications transition progressively from peripheral to central view. Through a within-subjects study (N=18), we evaluated our adaptive system against the default centralised approach. Results demonstrate that the adaptive system significantly reduces mental workload (p=0.041), temporal workload (p=0.008), and frustration (p=0.004) while maintaining comparable notification awareness. Logistic regression analysis reveals that users prefer the adaptive system even with classification errors, provided the combined misclassification rate (disruptiveness + omission errors) remains below a determinable threshold. Our findings establish the first empirical evidence that urgency-based spatial notification distribution effectively addresses core MR usability challenges, offering practical design guidelines for immersive notification systems that balance user attention management with information accessibility.