I've been working recently with a biofeedback device called the Nexus-4. It is a physiological monitoring unit that measures the following:
Blood Volume Pulse sensor
(in order to achieve Heart rate meaurments)
GSR
(Galvanic Skin response or Skin conductivity - used to measure states of emotional arousal in lie detectors)
Skin temperature Sensor
(to a high resolution - again indicating stress levels)
Respiration Sensor
(relative expansion of the abdomen or thorax during inhalation and exhalation
The data is captured by the unit and displayed in various visual forms in a piece of software called Bio-trace.
The data could of course be mapped and used as triggers in some form or another however capturing raw data is tricky especially when considering medical data. What is being measured by the Nexus-4 is precise and subtle and if required in real-time requires some careful consideration.
The following flowchart helps explain the decisions required at this stage.
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