We have developed a Matlab/spl trade/ based software package for bio-signal analysis. The software is based on modular design and can thus be easily adapted to fit on analysis of various kind of time variant or event-related bio-signals. Currently analysis programs for event-related potentials (ERP), heart-rate variability (HRV), galvanic skin responses (GSR) and quantitative EEG (qEEG) are implemented. A tool for time varying spectral analysis of bio-signals is currently under construction. By combining different analysis tools it is possible to build analyzing procedures based on the software not only for simple sense or attention related tasks but also e.g. for responses measured during complicated psychological tests.