Fixation detection for head-mounted eye tracking based on visual similarity of gaze targets

The study of consumer responses to advertising has recently expanded to include the use of eye-tracking to track the gaze of consumers. The calibration and validation of eye-gaze have typically been measured on large screens in static, controlled settings. However, little is known about how precise gaze localizations and eye fixations are on smaller screens, such as smartphones, and in moving feed-based conditions, such as those found on social media websites. We tested the precision of eye-tracking fixation detection algorithms relative to raw gaze mapping in natural scrolling conditions. Our results demonstrate that default fixation detection algorithms normally employed by hardware providers exhibit suboptimal performance on mobile phones. In this paper, we provide a detailed account of how different parameters in eye-tracking software can affect the validity and reliability of critical metrics, such as Percent Seen and Total Fixation Duration. We provide recommendations for producing improved eye-tracking metrics for content on small screens, such as smartphones, and vertically moving environments, such as a social media feed. The adjustments to the fixation detection algorithm we propose improves the accuracy of Percent Seen by 19% compared to a leading eye-tracking provider’s default fixation filter settings. The methodological approach provided in this paper could additionally serve as a framework for assessing the validity of applied neuroscience methods and metrics beyond mobile eye-tracking.

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Collecting and Analyzing Eye-Tracking Data in Outdoor Environments

Journal of Eye Movement Research ◽

10.16910/jemr.5.2.6 ◽

2012 ◽

Vol 5 (2) ◽

Author(s):

Karen M. Evans ◽

Robert A. Jacobs ◽

John A. Tarduno ◽

Jeff B. Pelz

Keyword(s):

Eye Tracking ◽

Large Set ◽

Tracking Data ◽

Outdoor Scenes ◽

Outdoor Environments ◽

Fixation Detection ◽

Mobile Eye Tracking ◽

General Method

Natural outdoor conditions pose unique obstacles for researchers, above and beyond those inherent to all mobile eye-tracking research. During analyses of a large set of eye-tracking data collected on geologists examining outdoor scenes, we have found that the nature of calibration, pupil identification, fixation detection, and gaze analysis all require procedures different from those typically used for indoor studies. Here, we discuss each of these challenges and present solutions, which together define a general method useful for investigations relying on outdoor eye-tracking data. We also discuss recommendations for improving the tools that are available, to further increase the accuracy and utility of outdoor eye-tracking data.

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An Eye-Tracking Study on Audiovisual Speech Perception Strategies Adopted by Normal-Hearing and Deaf Adults Under Different Language Familiarities

Journal of Speech Language and Hearing Research ◽

10.1044/2020_jslhr-19-00223 ◽

2020 ◽

Vol 63 (7) ◽

pp. 2245-2254 ◽

Cited By ~ 1

Author(s):

Jianrong Wang ◽

Yumeng Zhu ◽

Yu Chen ◽

Abdilbar Mamat ◽

Mei Yu ◽

...

Keyword(s):

Speech Perception ◽

Eye Tracking ◽

Normal Hearing ◽

Audiovisual Speech ◽

Audiovisual Speech Perception ◽

Allocation Pattern ◽

Deaf Adults ◽

Bilingual Speaker ◽

Primary Hypothesis ◽

Standard Chinese

Purpose The primary purpose of this study was to explore the audiovisual speech perception strategies.80.23.47 adopted by normal-hearing and deaf people in processing familiar and unfamiliar languages. Our primary hypothesis was that they would adopt different perception strategies due to different sensory experiences at an early age, limitations of the physical device, and the developmental gap of language, and others. Method Thirty normal-hearing adults and 33 prelingually deaf adults participated in the study. They were asked to perform judgment and listening tasks while watching videos of a Uygur–Mandarin bilingual speaker in a familiar language (Standard Chinese) or an unfamiliar language (Modern Uygur) while their eye movements were recorded by eye-tracking technology. Results Task had a slight influence on the distribution of selective attention, whereas subject and language had significant influences. To be specific, the normal-hearing and the d10eaf participants mainly gazed at the speaker's eyes and mouth, respectively, in the experiment; moreover, while the normal-hearing participants had to stare longer at the speaker's mouth when they confronted with the unfamiliar language Modern Uygur, the deaf participant did not change their attention allocation pattern when perceiving the two languages. Conclusions Normal-hearing and deaf adults adopt different audiovisual speech perception strategies: Normal-hearing adults mainly look at the eyes, and deaf adults mainly look at the mouth. Additionally, language and task can also modulate the speech perception strategy.

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Activation and Persistence of Implicit Causality Information in Spoken Language Comprehension

Experimental Psychology (formerly Zeitschrift für Experimentelle Psychologie) ◽

10.1027/1618-3169/a000002 ◽

2010 ◽

Vol 57 (1) ◽

pp. 5-16 ◽

Cited By ~ 46

Author(s):

Pirita Pyykkönen ◽

Juhani Järvikivi

Keyword(s):

Eye Tracking ◽

Language Comprehension ◽

Spoken Language ◽

Visual World ◽

Implicit Causality ◽

Causality Information ◽

Spoken Language Comprehension

A visual world eye-tracking study investigated the activation and persistence of implicit causality information in spoken language comprehension. We showed that people infer the implicit causality of verbs as soon as they encounter such verbs in discourse, as is predicted by proponents of the immediate focusing account ( Greene & McKoon, 1995 ; Koornneef & Van Berkum, 2006 ; Van Berkum, Koornneef, Otten, & Nieuwland, 2007 ). Interestingly, we observed activation of implicit causality information even before people encountered the causal conjunction. However, while implicit causality information was persistent as the discourse unfolded, it did not have a privileged role as a focusing cue immediately at the ambiguous pronoun when people were resolving its antecedent. Instead, our study indicated that implicit causality does not affect all referents to the same extent, rather it interacts with other cues in the discourse, especially when one of the referents is already prominently in focus.

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