Journal of Eye Movement Research

This article examines the nature of musical stimuli used in eye-movement research on music reading, with a focus on syntactic elements essential for fluent reading: melody, rhythm, and harmony. Drawing parallels between language and music as syntactic systems, the study critiques the widespread use of stimuli that lack coherent musical structure, such as random pitch sequences or rhythmically ambiguous patterns. Eight peer-reviewed studies were analyzed based on their use of stimuli specifically composed for research purposes. The findings reveal that most stimuli do not reflect authentic musical syntax, limiting the validity of conclusions about music reading processes. The article also explores how researchers interpret the concept of “complexity” in musical stimuli, noting inconsistencies and a lack of standardized criteria. Additionally, it highlights the importance of considering motor planning and instrument-specific challenges, which are often overlooked in experimental design. The study calls for more deliberate and informed stimulus design in future research, emphasizing the need for syntactically meaningful musical excerpts and standardized definitions of complexity. Such improvements are essential for advancing the understanding of syntactic processing in music reading and ensuring methodological consistency across studies.

This study compares the roles of eye-tracking and verbal reports (think-alouds and retrospective verbal reports, RVRs) in L2 reading process research through three qualitative studies. Findings indicate that eye-tracking provided precise, quantitative data on visual attention and reading patterns (e.g., fixation duration, gaze plots) and choice-making during gap-filling. Based on our mapping, it was mostly effective in identifying 13 out of 47 reading processing strategies, primarily those involving skimming or scanning that had distinctive eye-movement signatures. Verbal reports, while less exact in measurement, offered direct access to cognitive processes (e.g., strategy use, reasoning) and uncovered content-specific thoughts inaccessible to eye-tracking. Both methods exhibited reactivity: eye-tracking could cause physical discomfort or altered reading behavior, whereas think-alouds could disrupt task flow or enhance reflection. This study reveals the respective strengths and limitations of eye-tracking and verbal reports in L2 reading research. It facilitates a more informed selection and application of these methodological approaches in alignment with specific research objectives, whether employed in isolation or in an integrated manner.

Driving is a cognitively demanding task engaging attentional effort and working memory resources, which increases cognitive load. The aim of this study was to evaluate the discriminative capabilities of an objective eye tracking method in comparison to a subjective self-report scale (the NASA–Task Load Index) in distinguishing cognitive load levels during driving. Participants (N = 685) performed highway and urban driving in a fixed-base driving simulator. The N-Back test was used as a secondary task to increase cognitive load. In line with previous studies, the NASA–Task Load Index was shown to be an accurate self-report tool in distinguishing conditions with higher and lower levels of cognitive load due to the additional N-Back task, with best average accuracy of 0.81 within the highway driving scenario. Eye gaze metrics worked best when differentiating between stages of highway and urban driving, with an average accuracy of 0.82. Eye gaze entropy measures were the best indicators for cognitive load dynamics, with average accuracy reaching 0.95 for gaze transition entropy in the urban vs. highway comparison. Eye gaze metrics showed significant correlations with the NASA–Task Load Index results in urban driving stages, but not in highway driving. The results demonstrate that eye gaze metrics can be used in combination with self-reports for developing algorithms of cognitive load evaluation and reliable driver state prediction in different road conditions.