  The application of psychophysiological in human-computer interaction is a
growing field with significant potential for future smart personalised systems.
Working in this emerging field requires comprehension of an array of
physiological signals and analysis techniques.
  Stream processing sytems (SPS) are emerging computational platforms that can
be utilized in human-computer interaction for real-time analysis of high-volume
multimodal signals. Usage of complementary information contained in multiple
signals is desireable as it can make HCI systems more robust. In this preprint
we review existing software and hardware solutions for HCI-centric stream
processing systems. The preprint also includes a brief introduction into SPS
design considerations and structure from the perspective of analysing
physiological signals.
  This paper aims to serve as a primer for the novice, enabling rapid
familiarisation with the latest core concepts. We put special emphasis on
everyday human-computer interface applications to distinguish from the more
common clinical or sports uses of psychophysiology.
  This paper is an extract from a comprehensive review of the entire field of
ambulatory psychophysiology, including 12 similar chapters, plus application
guidelines and systematic review. Thus any citation should be made using the
following reference: B. Cowley, M. Filetti, K. Lukander, J. Torniainen, A.
Henelius, L. Ahonen, O. Barral, I. Kosunen, T. Valtonen, M. Huotilainen, N.
Ravaja, G. Jacucci. The Psychophysiology Primer: a guide to methods and a broad
review with a focus on human-computer interaction. Foundations and Trends in
Human-Computer Interaction, vol. 9, no. 3-4, pp. 150--307, 2016.
