Abstract
Eye tracking (ET) is becoming a popular tool to study the consumer behavior. One of the significant problems that arise with ET integrated into 3D virtual reality is defining fixations and saccades, which are essential part of feature extraction in ET analysis and have a critical impact on higher level analysis. In this study, the ET data from 60 subjects, were recorded. To define the fixations, Dispersion Threshold Identification algorithm was used which requires to define several thresholds. Since there are multiple thresholds and extracted features, a Multi-Objective Reinforcement Learning (MORL) algorithm was implemented to solve this problem. The objective of the study was to optimize these thresholds in order to improve accuracy of classification of the age based on different visual patterns undertaken by the subject during shopping in a virtual store. Regarding the nature of the classification, the objective for this optimization problem was to maximize the differences between the averages of each feature in different classes and minimize the variances of the same feature within each class. For the current study, thresholds optimization has shown an improvement in results for the accuracies of classification between age groups after applying the MORL algorithm. In conclusion, the results suggest that the optimization of thresholds is an important factor to improve feature extraction methods and in turn improve the overall results of an ET study involving consumer behavior inside virtual reality. This method can be used to optimize thresholds in similar studies to provide improved accuracy of classification results.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
Meißner, M., Pfeiffer, J., Pfeiffer, T., Oppewal, H.: Combining virtual reality and mobile eye tracking to provide a naturalistic experimental environment for shopper research. J. Bus. Res. 100, 445–458 (2019). https://doi.org/10.1016/j.jbusres.2017.09.028
Just, M.A., Carpenter, P.A.: Using eye fixations to study reading comprehension. In: New Methods in Reading Comprehension Research, pp. 151–182. Routledge (2019)
Eye Tracker System Manual ASL EyeTrac 6 EyeNal Analysis Software (2007)
Rayner, K.: Eye movements in reading and information processing: 20 years of research. Psychol. Bull. 124, 372–422 (1998). https://doi.org/10.1037/0033-2909.124.3.372
Salvucci, D.D., Goldberg, J.H.: Identifying fixations and saccades in eye-tracking protocols. In: ETRA’00: Proceedings of the 2000 Symposium on Eye Tracking Research & Applications, pp. 71–78 (2000). https://doi.org/10.1145/355017.355028
Liao, H.L., Wu, Q.H., Jiang, L.: Multi-objective optimization by reinforcement learning for power system dispatch and voltage stability. In: 2010 IEEE PES Innovative Smart Grid Technologies Conference Europe (ISGT Europe), pp. 1–8 (2010). https://doi.org/10.1109/ISGTEUROPE.2010.5638914
VIVE Pro: The professional-grade VR headset. https://www.vive.com/eu/product/vive-pro/ Accessed 15 March 2020
Blignaut, P.: Fixation identification: the optimum threshold for a dispersion algorithm. Atten. Percept. Psychophys. 71, 881–895 (2009). https://doi.org/10.3758/APP.71.4.881
Acknowledgements
This work was supported by the European Commission (Project RHUMBO H2020-MSCA-ITN-2018-813234 and HELIOS H2020-825585).
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2020 Springer Nature Switzerland AG
About this paper
Cite this paper
Khatri, J. et al. (2020). Optimizing Virtual Reality Eye Tracking Fixation Algorithm Thresholds Based on Shopper Behavior and Age. In: Stephanidis, C., Antona, M. (eds) HCI International 2020 - Posters. HCII 2020. Communications in Computer and Information Science, vol 1225. Springer, Cham. https://doi.org/10.1007/978-3-030-50729-9_9
Download citation
DOI: https://doi.org/10.1007/978-3-030-50729-9_9
Published:
Publisher Name: Springer, Cham
Print ISBN: 978-3-030-50728-2
Online ISBN: 978-3-030-50729-9
eBook Packages: Computer ScienceComputer Science (R0)