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In this paper, we present a wearable assistant for Parkinson's disease (PD) patients with the freezing of gait (FOG) symptom. This wearable system uses on-body acceleration sensors to measure the patients' movements. It automatically detects FOG by analyzing frequency components inherent in these movements. When FOG is detected, the assistant provides a(More)
In this paper we introduce the concept of a wearable assistant for swimmer, called SwimMaster. The SwimMaster consists of acceleration sensors with micro-controllers and feedback interface modules that swimmer wear while swimming. With four different evaluation studies and a total of 22 subjects we demonstrate the functionality and power of the SwimMaster(More)
We present a research platform for combined physiological signal acquisition and context-awareness. This platform seeks to be wearable, it has extended battery life, it offers enough computational power to run context-recognition algorithms and it is flexible so that a variable number of sensors can be added to it. So far the system is composed of a(More)
—Freezing of gait (FOG) is a common gait deficit in advanced Parkinson's disease (PD). It is often a cause of falls, interferes with daily activities and significantly impairs quality of life. Gait deficits in PD patients are often resistant to pharmacologic treatment; therefore effective non-pharmacologic assistance is needed.
Template-based approaches using acceleration signals have been proposed for gait-based biometric authentication. In daily life a number of real-world factors affect the users' gait and we investigate their effects on authentication performance. We analyze the effect of walking speed, different shoes, extra load, and the natural variation over days on the(More)
OBJECTIVES In this work the effect of quasi-stationary movements on the electrodermal activity (EDA) after a startle event has been investigated and evaluated. In previous EDA research there is a discrepancy between the use of controlled environment studies and daily life surveys. This paper aims to address this by expanding the knowledge about EDA in real(More)
Freezing of gait (FOG) is a common gait deficit in advanced Parkinson's disease (PD). It is often a cause of falls, interferes with daily activities and significantly impairs quality of life. PD patients can be assisted by auditory cueing. In daily life cueing should be automatic during gait freeze. This paper describes our ambulatory research platform for(More)
We evaluate three different non-interrupting user interfaces that give feedback to a swimmer while swimming. We designed three interfaces for audio, visual and haptic feedback. These three systems were used in an experiment to give commands to a swimmer. The recognition rate and the reaction time for each modality was determined. The systems do not(More)