It is crucial that the interface design of mobile apps be age-appropriate at this stage of global aging, as the new epidemic has resulted in a higher sense of isolation among older persons. In this study, four typical senior social service mobile applications were chosen to give older persons the ability to complete user login duties. The participants were 16 older adults (7 men and 9 women) aged 55 to 76. Both objective and subjective data, including task completion time, gaze length, pupil diameter changes, EEG wave amplitude changes, and subjective sensations of older persons, were gathered using a combination of eye-movement and EEG signal approaches. The program was created to investigate the effects of interface design aspects on older people’s task performance, including interface layout, interface color, information density, icon size and position, etc. The study’s findings revealed that when the user task completion time and average fixation duration were shorter, the line of sight was more equally distributed, the visual focus was closer to the login button, and the average EEG amplitude of the user changed more, the older adults performed better. The palace layout had a more positive effect on job completion among older individuals when it came to interface layout. In terms of interface color, colored (contrasting) colors should serve to highlight the interface’s essential information points while they can be removed. In terms of interface information density, a low-density level interface design can simplify and lower the cognitive load of task execution for older people. The first level of icons in the interface and their position in the visual center of the interface is the best interface design for older persons in terms of icon size and position. The results of this study have theoretical ramifications for a thorough understanding of the factors influencing older people’s task performance, practical ramifications for the design of older people-centered interfaces, and they contribute to our understanding of the characteristics of older people’s interface interaction behavior.

The office environment significantly influences employees’ work efficiency and health. With the increasing prevalence of modern, enclosed and monotonous office settings, employees often work under high-intensity conditions for extended periods. This situation leads to physiological and psychological fatigue, which in turn affects work efficiency and overall well-being. This study explores how olfactory stimulation influences physiological and psychological fatigue in office environments. It also examines its effects on cognitive recovery. Through market research and user surveys, three types of scents were selected as experimental materials (floral, fruity, and forest scents). Utilizing multi-channel fatigue identification technology and wearable biosensors, the study monitored in real-time the physiological responses of employees to different olfactory stimuli, such as pupil diameter, heart rate variability (HRV), electromyography (EMG), and electroencephalogram (EEG) signals. Additionally, subjective evaluation questionnaires were used to comprehensively assess the effects of olfactory stimulation on psychological fatigue. The results showed that all three olfactory interventions to some extent alleviated employee fatigue and improved cognitive abilities. Among them, the floral intervention had a better effect on the recovery of physiological fatigue, the fruity intervention had a better effect on the recovery of psychological fatigue and cognitive abilities, and the forest intervention had a slightly inferior recovery effect but could effectively reduce time load. This research aims to provide new ideas for the design of sustainable office working environments. Introducing appropriate olfactory stimuli can effectively alleviate employees’ office fatigue, enhance their work efficiency and overall well-being.