Details
| Original language | English |
|---|---|
| Pages (from-to) | 1853-1863 |
| Number of pages | 11 |
| Journal | Behavior research methods |
| Volume | 50 |
| Issue number | 5 |
| Early online date | 6 Sept 2017 |
| Publication status | Published - Oct 2018 |
| Externally published | Yes |
Abstract
Up to now, the potential of eye tracking in science as well as in everyday life has not been fully realized because of the high acquisition cost of trackers. Recently, manufacturers have introduced low-cost devices, preparing the way for wider use of this underutilized technology. As soon as scientists show independently of the manufacturers that low-cost devices are accurate enough for application and research, the real advent of eye trackers will have arrived. To facilitate this development, we propose a simple approach for comparing two eye trackers by adopting a method that psychologists have been practicing in diagnostics for decades: correlating constructs to show reliability and validity. In a laboratory study, we ran the newer, low-cost EyeTribe eye tracker and an established SensoMotoric Instruments eye tracker at the same time, positioning one above the other. This design allowed us to directly correlate the eye-tracking metrics of the two devices over time. The experiment was embedded in a research project on memory where 26 participants viewed pictures or words and had to make cognitive judgments afterwards. The outputs of both trackers, that is, the pupil size and point of regard, were highly correlated, as estimated in a mixed effects model. Furthermore, calibration quality explained a substantial amount of individual differences for gaze, but not pupil size. Since data quality is not compromised, we conclude that low-cost eye trackers, in many cases, may be reliable alternatives to established devices.
Keywords
- Eye tracking, Low cost, Pupil size
ASJC Scopus subject areas
- Psychology(all)
- Experimental and Cognitive Psychology
- Psychology(all)
- General Psychology
- Psychology(all)
- Developmental and Educational Psychology
- Arts and Humanities(all)
- Arts and Humanities (miscellaneous)
- Psychology(all)
- Psychology (miscellaneous)
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In: Behavior research methods, Vol. 50, No. 5, 10.2018, p. 1853-1863.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Comparing eye trackers by correlating their eye-metric data
AU - Titz, Johannes
AU - Scholz, Agnes
AU - Sedlmeier, Peter
N1 - Publisher Copyright: © 2017, Psychonomic Society, Inc.
PY - 2018/10
Y1 - 2018/10
N2 - Up to now, the potential of eye tracking in science as well as in everyday life has not been fully realized because of the high acquisition cost of trackers. Recently, manufacturers have introduced low-cost devices, preparing the way for wider use of this underutilized technology. As soon as scientists show independently of the manufacturers that low-cost devices are accurate enough for application and research, the real advent of eye trackers will have arrived. To facilitate this development, we propose a simple approach for comparing two eye trackers by adopting a method that psychologists have been practicing in diagnostics for decades: correlating constructs to show reliability and validity. In a laboratory study, we ran the newer, low-cost EyeTribe eye tracker and an established SensoMotoric Instruments eye tracker at the same time, positioning one above the other. This design allowed us to directly correlate the eye-tracking metrics of the two devices over time. The experiment was embedded in a research project on memory where 26 participants viewed pictures or words and had to make cognitive judgments afterwards. The outputs of both trackers, that is, the pupil size and point of regard, were highly correlated, as estimated in a mixed effects model. Furthermore, calibration quality explained a substantial amount of individual differences for gaze, but not pupil size. Since data quality is not compromised, we conclude that low-cost eye trackers, in many cases, may be reliable alternatives to established devices.
AB - Up to now, the potential of eye tracking in science as well as in everyday life has not been fully realized because of the high acquisition cost of trackers. Recently, manufacturers have introduced low-cost devices, preparing the way for wider use of this underutilized technology. As soon as scientists show independently of the manufacturers that low-cost devices are accurate enough for application and research, the real advent of eye trackers will have arrived. To facilitate this development, we propose a simple approach for comparing two eye trackers by adopting a method that psychologists have been practicing in diagnostics for decades: correlating constructs to show reliability and validity. In a laboratory study, we ran the newer, low-cost EyeTribe eye tracker and an established SensoMotoric Instruments eye tracker at the same time, positioning one above the other. This design allowed us to directly correlate the eye-tracking metrics of the two devices over time. The experiment was embedded in a research project on memory where 26 participants viewed pictures or words and had to make cognitive judgments afterwards. The outputs of both trackers, that is, the pupil size and point of regard, were highly correlated, as estimated in a mixed effects model. Furthermore, calibration quality explained a substantial amount of individual differences for gaze, but not pupil size. Since data quality is not compromised, we conclude that low-cost eye trackers, in many cases, may be reliable alternatives to established devices.
KW - Eye tracking
KW - Low cost
KW - Pupil size
UR - http://www.scopus.com/inward/record.url?scp=85028805042&partnerID=8YFLogxK
U2 - 10.3758/S13428-017-0954-Y
DO - 10.3758/S13428-017-0954-Y
M3 - Article
VL - 50
SP - 1853
EP - 1863
JO - Behavior research methods
JF - Behavior research methods
SN - 0743-3808
IS - 5
ER -