Data Acquisition for Biofeedback System Using LabVIEW Characterization Presentation Performed by Rapoport Alexandra Supervised by Eugene Rivkin Technion Department of Electrical Engineering The High Speed Digital Systems Laboratory

General Concepts of Biofeedback  Used for training of self control.  The emotional state of a person is determined according to physiological parameters such as skin resistance, skin temperature, EEG, pulse, etc.  The response of the system is given by visual presentation.

A/D Temperature and resistance detectors System Description Measurements to voltage transformation

Detectors  Temperature detectors – one for each side. Possible implementation – by temperature dependent variable resistance.  Skin resistance detectors – one for each side. Possible implementation – by inducing alternating current through skin and voltage measurement.

Medical Requirements  Maximal current permitted - 5μA  The detector part has to be isolated from the A/D and interpretation part

Hardware Specifications A/D  A/D card used: LabVIEW card PCI 6035E  12 channels (4 channels used)  16 bit each  Voltage limits: V

Software Specifications  LabVIEW6 based interpretation

System Structure LabVIEW interpretation PCI 6035E 4x16 bit 4 channels (of 12) Temperature to Voltage Resistance to Voltage Two parts isolated

Physiological Issues  Left and right side measurements differences.  Time delays of parameters changing.

Schedule  Characterization presentation  – Learning LabVIEW and more more precise problem definition  Software programming  – Hardware design  – Mid Semester Presentation