Detection of Activity Transitions toward Developing a Memory Aid for People with Higher Brain Dysfunction

M. Kondo, Y. Yamada, and T. Hirotomi (Japan)


Cognitive Prosthetics, Rehabilitation Engineering, ChangePoint Detection, Memory Aids, Higher Brain Dysfunction


People with higher brain dysfunction need a “smart” memory aid to enhance the ability to regulate their activities. Such an aid should provide external cues, possibly in association with corresponding instructions, at not only predefined times but also when irregular behaviors are detected. As a first step toward its development, we have examined the possibility of detecting such behaviors by analyzing the 3-axis accelerations of user motion. On the basis of our experimental data, we have focused our attention on transitive behaviors between different activities. The standard deviations of the accelerations during the transition tend to be higher than those during the preceding and following activities. We have implemented a method for detecting activity transitions. The method is sufficiently simple to work in real time and does not require training data in advance. These points suggest the high applicability of the method to use in actual day/homecare settings. In this paper, we present our pilot study performed using able-bodied subjects, the characteristics of the accelerations measured during the study, the implementation of the method, and its evaluation.

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