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Acknowledgement First of all, I thank God for providing me such an opportunity and support. support and kind encouragement on thesis and professional issues have effectively guided me to right path. I take this opportunity to convey my sincere thanks and deep sense of gratitude to him, for his invaluable guidance, suggestions, inspiration and constant encouragement throughout the period of this...

To improve human-computer interaction (HCI), computers need to recognize and respond properly to their user’s emotional state. This is a fundamental application of affective computing, which relates to, arises from, or deliberately influences emotion. As a first step to a system that recognizes emotions of individual users, this research focuses on how emotional experiences are expressed in six...

Human stress is a physiological tension that appears when a person responds to mental, emotional, or physical chal-lenges. Detecting human stress and developing methods to manage it, has become an important issue nowadays. Auto-matic stress detection through physiological signals may be a useful method to solve this problem. In most of the earlier studies, long-term time window was considered f...

The rapid growth of the availability of wearable biosensors has created the opportunity for using biological signals to measure worker performance. An important question is how to use such signals to not just measure, but actually predict worker performance on a task under stressful and potentially high risk conditions. Here we show that the biological signal known as galvanic skin response (GS...

This paper presents a frequency modulation based readout circuit for the measurement of skin conductance or resistance. A charge pump based frequency-to-voltage converter circuit with adjustable sensitivity is used to convert the frequency shifts due to skin resistance changes into voltage variations. The readout circuit improves the measurement accuracy and artifact rejection in measurements o...

This study was conducted to investigate whether two electrophysiological signals, which are galvanic skin response (GSR) and skin temperature could be altered when exposed to different auditory stimuli such as Classical Turkish Music (CTM) and acoustic white noise. We measured physiological responses of the twenty-three schizophrenic patients and twenty-three healthy subjects in rest and audito...

Objectives: The objective of this study was to study the effects of meditation on stress-induced changes in cognitive functions. Methods: The study was conducted on 32 healthy adult male student volunteers who had never practiced meditation before the study. The study consisted of practicing 20 minutes of guided meditation and administration of psychologic stress to the subjects. The psychologi...