Monitoring and Processing of the Pupil Diameter Signal for Affective Assessment of a Computer User

Authors:
Ying Gao;Armando Barreto;Malek Adjouadi
Affiliations:
Department of Electrical and Computer Engineering, Florida International University, Miami, USA FL 33174;Department of Electrical and Computer Engineering, Florida International University, Miami, USA FL 33174;Department of Electrical and Computer Engineering, Florida International University, Miami, USA FL 33174
Venue:
Proceedings of the 13th International Conference on Human-Computer Interaction. Part I: New Trends
Year:
2009

Citing 4
Cited 0

Adaptive signal processing

Adaptive signal processing
Affective computing

Affective computing
Pupil size variation as an indication of affective processing

International Journal of Human-Computer Studies - Application of affective computing in human—Computer interaction
H/sup /spl infin// adaptive filtering

ICASSP '95 Proceedings of the Acoustics, Speech, and Signal Processing, 1995. on International Conference - Volume 02

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Abstract

The pupil diameter (PD) has been found to respond to cognitive and emotional processes. However, the pupillary light reflex (PLR), is known to be the dominant factor in determining pupil size. In this paper, we attempt to minimize the PLR-driven component in the measured PD signal, through an Adaptive Interference Canceller (AIC), with the H∞ time-varying (HITV) adaptive algorithm, so that the output of the AIC, the Modified Pupil Diameter (MPD), can be used as an indication of the pupillary affective response (PAR) after some post-processing. The results of this study confirm that the AIC with the HITV adaptive algorithm is able to minimize the PD changes caused by PLR to an acceptable level, to facilitate the affective assessment of a computer user through the resulting MPD signal.