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PsPM stands for PsychoPhysiological Modelling. It is a powerful MATLAB toolbox for model-based analysis of psychophysiological signals, for example skin conductance response (SCR), electrocardiography (ECG), respiration, pupil size, or startle eye-blink electromyography (EMG). Currently, PsPM implements models for all of these modalities and the data formats they use. We are working towards further models, for example, for skin potential and ocular scan path length.

PsPM allows inferring a psychological variable from observable physiological data. For example, associative memory can be inferred from observed SCR signals. This allows for quantitative description of hidden processes, increases the temporal resolution of analysis, and suppresses noise.

PsPM implements simple General Linear Convolution Models (GLMs) for evoked SCR, or uses the Dynamic Causal Modelling (DCM) framework — as a tool to invert more complicated, non-linear models of SCR signals, for example for spontaneous fluctuations or anticipatory responses. Inference is drawn in a hierarchical summary-statistic approach (similar to SPM software for functional magnetic resonance imaging).

PsPM also supports other kinds of data for which no models exist yet, in particular we have extended support for eyetracking data.

The flexible software allows import of a number of data formats, including Spike, Biopac, VarioPort, (exported) ADInstruments LabChart, (exported) Biograph Infiniti, (exported) MindMedia BioTrace, Dataq/Windaq, AckKnowledge, ScanPhysLog, EDF, (exported) Eyelink, Matlab, and Text files. We are working on the support towards Brain Imaging Data Structure (BIDS) and expect to include the feature in the release 6.2.

Further features are simple programming of add-ons for import and modelling of new data types and automatic creation of batch scripts via the GUI.

PsPM incorporates the previous software package SCRalyze and offers all features of SCRalyze plus many more. If you have started working on a project with SCRalyze and want to continue, you can still find previous software versions, help, and resources on http://scralyze.sourceforge.net.

PsPM is provided under the GNU General Public License (c) by Professor Dominik R. Bach, University College London, University of Bonn, and University of Zurich.