research-article

Cognitive Heat: Exploring the Usage of Thermal Imaging to Unobtrusively Estimate Cognitive Load

Authors:

Yomna Abdelrahman,

Eduardo Velloso,

Tilman Dingler,

Albrecht Schmidt,

Frank VetereAuthors Info & Claims

Proceedings of the ACM on Interactive, Mobile, Wearable and Ubiquitous Technologies, Volume 1, Issue 3

Article No.: 33, Pages 1 - 20

https://doi.org/10.1145/3130898

Published: 11 September 2017 Publication History

Abstract

Current digital systems are largely blind to users’ cognitive states. Systems that adapt to users’ states show great potential for augmenting cognition and for creating novel user experiences. However, most approaches for sensing cognitive states, and cognitive load specifically, involve obtrusive technologies, such as physiological sensors attached to users’ bodies. This paper present an unobtrusive indicator of the users’ cognitive load based on thermal imaging that is applicable in real-world. We use a commercial thermal camera to monitor a person’s forehead and nose temperature changes to estimate their cognitive load. To assess the effect of different levels of cognitive load on facial temperature we conducted a user study with 12 participants. The study showed that different levels of the Stroop test and the complexity of reading texts affect facial temperature patterns, thereby giving a measure of cognitive load. To validate the feasibility for real-time assessments of cognitive load, we conducted a second study with 24 participants, we analyzed the temporal latency of temperature changes. Our system detected temperature changes with an average latency of 0.7 seconds after users were exposed to a stimulus, outperforming latency in related work that used other thermal imaging techniques. We provide empirical evidence showing how to unobtrusively detect changes in cognitive load in real-time. Our exploration of exposing users to different content types gives rise to thermal-based activity tracking, which facilitates new applications in the field of cognition-aware computing.

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Cognitive Heat: Exploring the Usage of Thermal Imaging to Unobtrusively Estimate Cognitive Load

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cover image Proceedings of the ACM on Interactive, Mobile, Wearable and Ubiquitous Technologies

Proceedings of the ACM on Interactive, Mobile, Wearable and Ubiquitous Technologies Volume 1, Issue 3

September 2017

2023 pages

EISSN:2474-9567

DOI:10.1145/3139486

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Publication History

Published: 11 September 2017

Accepted: 01 June 2017

Revised: 01 May 2017

Received: 01 February 2017

Published in IMWUT Volume 1, Issue 3

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German Research Foundation within the SimTech Cluster of Excellence
Amplify project which received funding from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme
Victorian State Government and Microsoft through their contributions to the Microsoft Research Centre for Social Natural User Interfaces (SocialNUI)

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