{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,29]],"date-time":"2026-09-29T10:02:10Z","timestamp":1790676130297,"version":"4.1.0"},"reference-count":32,"publisher":"MDPI AG","issue":"5","license":[{"start":{"date-parts":[[2026,9,23]],"date-time":"2026-09-23T00:00:00Z","timestamp":1790121600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["J. Eye Mov. Res.","JEMR"],"abstract":"<jats:p>Instrument Landing System (ILS) approaches impose distinct visual demands across two operational segments, including (i) an intermediate approach segment prior to the final approach fix (FAF), during which pilots intercept and track the localizer while complying with published altitude restrictions and the glideslope-intercept altitude, and (ii) the final approach (FA) segment from the FAF to decision altitude\/decision height, during which pilots precisely maintain both localizer and glideslope guidance. Using eye tracking, this study examines segment-specific scan behavior during simulated ILS approaches in low visibility conditions performed by 36 licensed pilots in a Cessna 172 equipped with G1000 avionics. The study results show that successful approaches were characterized by suppressed external viewing, more compact scans, and more organized return-loop patterns, suggesting that effective ILS scan discipline depends not only on looking at task-relevant instruments, but also on organizing those scans into phase-appropriate and functionally integrated sequences. By linking gaze allocation, scan dispersion, and scan sequence patterns to approach outcomes, this study demonstrates how eye tracking can provide segment-sensitive markers of instrument-scan quality. We further propose candidate scan-assessment metrics that may contribute to more precise and objective simulator debriefing, as well as future flightdeck-interface concepts that may support disciplined cross-checking without increasing pilot workload.<\/jats:p>","DOI":"10.3390\/jemr19050109","type":"journal-article","created":{"date-parts":[[2026,9,23]],"date-time":"2026-09-23T11:09:08Z","timestamp":1790161748000},"page":"109","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["From Gaze Allocation to Scan Sequences: A Segment-Sensitive Eye-Tracking Study of Pilot Scan Discipline During Simulated Instrument Landing System Approaches"],"prefix":"10.3390","volume":"19","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9874-9551","authenticated-orcid":false,"given":"Bo","family":"Fu","sequence":"first","affiliation":[{"name":"Department of Computer Engineering and Computer Science, California State University, 1250 Bellflower Blvd., Long Beach, CA 90840, USA"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"conceptualization","vocabulary":"credit"},{"role":"investigation","vocabulary":"credit"},{"role":"visualization","vocabulary":"credit"},{"role":"methodology","vocabulary":"credit"},{"role":"resources","vocabulary":"credit"},{"role":"supervision","vocabulary":"credit"},{"role":"software","vocabulary":"credit"},{"role":"data-curation","vocabulary":"credit"},{"role":"project-administration","vocabulary":"credit"},{"role":"validation","vocabulary":"credit"},{"role":"writing-original-draft","vocabulary":"credit"},{"role":"funding-acquisition","vocabulary":"credit"},{"role":"formal-analysis","vocabulary":"credit"},{"role":"writing-review-editing","vocabulary":"credit"}]},{"given":"Jonathan","family":"Pe\u00f1a","sequence":"additional","affiliation":[{"name":"Department of Computer Engineering and Computer Science, California State University, 1250 Bellflower Blvd., Long Beach, CA 90840, USA"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"software","vocabulary":"credit"},{"role":"data-curation","vocabulary":"credit"}]},{"given":"Oscar","family":"Arenas","sequence":"additional","affiliation":[{"name":"Department of Computer Engineering and Computer Science, California State University, 1250 Bellflower Blvd., Long Beach, CA 90840, USA"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"software","vocabulary":"credit"}]},{"given":"Russell","family":"Harral","sequence":"additional","affiliation":[{"name":"Department of Computer Engineering and Computer Science, California State University, 1250 Bellflower Blvd., Long Beach, CA 90840, USA"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"software","vocabulary":"credit"}]}],"member":"1968","published-online":{"date-parts":[[2026,9,23]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"75","DOI":"10.1080\/10508414.2017.1313096","article-title":"Gaze Behavior and Visual Attention: A Review of Eye Tracking Studies in Aviation","volume":"26","author":"Ziv","year":"2016","journal-title":"Int. J. Aviat. Psychol."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"98","DOI":"10.1080\/24721840.2018.1514978","article-title":"Eye-Tracking Measures in Aviation: A Selective Literature Review","volume":"28","author":"Wickens","year":"2018","journal-title":"Int. J. Aerosp. Psychol."},{"key":"ref_3","first-page":"1920","article-title":"Investigation of Pilots\u2019 Visual Entropy and Eye Fixations for Simulated Flights Consisted of Multiple Take-Offs and Landings","volume":"31","author":"Naeeri","year":"2022","journal-title":"J. Aviat.\/Aerosp. Educ. Res."},{"key":"ref_4","doi-asserted-by":"crossref","unstructured":"Lounis, C., Peysakhovich, V., and Causse, M. (2021). Visual scanning strategies in the cockpit are modulated by pilots\u2019 expertise: A flight simulator study. PLoS ONE, 16.","DOI":"10.1371\/journal.pone.0247061"},{"key":"ref_5","unstructured":"Harris, D. (2016). The Research of Eye Movement Behavior of Expert and Novice in Flight Simulation of Landing. Engineering Psychology and Cognitive Ergonomics EPCE 2016, Springer International Publishing. LNCS 9736."},{"key":"ref_6","unstructured":"Kasarskis, P., Stehwien, J., Hickox, J., Aretz, A., and Wickens, C. (2001, January 5\u20138). Comparison of expert and novice scan behaviors during VFR flight. Proceedings of the 11th International Symposium on Aviation Psychology Columbus, Columbus, OH, USA."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"980","DOI":"10.1037\/bul0000207","article-title":"The relationship between gaze behavior, expertise, and performance: A systematic review","volume":"145","author":"Brams","year":"2019","journal-title":"Psychol. Bull."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"15","DOI":"10.1080\/10508414.2017.1366269","article-title":"Pilot Flying and Pilot Monitoring\u2019s Aircraft State Awareness During Go-Around Execution in Aviation: A Behavioral and Eye Tracking Study","volume":"27","author":"Dehais","year":"2017","journal-title":"Int. J. Aerosp. Psychol."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"1284","DOI":"10.1080\/00140139.2023.2298992","article-title":"How flight experience impacts pilots\u2019 decision-making and visual scanning pattern in low-visibility approaches: Preliminary evidence from eye tracking","volume":"67","author":"Gao","year":"2024","journal-title":"Ergonomics"},{"key":"ref_10","doi-asserted-by":"crossref","unstructured":"Ayala, N., Calderon, C.M., Sharma, N., Irving, E., Cao, S., Kearns, S., and Niechwiej-Szwedo, E. (2024, January 4\u20137). Examining the Utility of Blink Rate as a Proxy for Cognitive Load in Flight Simulation. Proceedings of the 2024 Symposium on Eye Tracking Research and Applications (ETRA \u201924), Glasgow, UK.","DOI":"10.1145\/3649902.3653336"},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"1","DOI":"10.16910\/jemr.12.3.3","article-title":"Estimating Pilots\u2019 Cognitive Load from Ocular Parameters Through Simulation and In-Flight Studies","volume":"12","author":"Babu","year":"2019","journal-title":"J. Eye Mov. Res."},{"key":"ref_12","doi-asserted-by":"crossref","unstructured":"Fu, B., Soriano, A.R., Chu, K., Gatsby, P., and Nicolas, G. (2024, January 1\u20134). Modelling Visual Attention for Future Intelligent Flight Deck\u2014A Case Study of Pilot Eye Tracking in Simulated Flight Takeoff. Proceedings of the 32nd ACM Conference on User Modeling, Adaptation and Personalization, Cagliari, Italy.","DOI":"10.1145\/3631700.3664871"},{"key":"ref_13","doi-asserted-by":"crossref","unstructured":"Hebbar, P.A., Bhattacharya, K., Prabhakar, G., Pashilkar, A.A., and Biswas, P. (2021). Correlation Between Physiological and Performance-Based Metrics to Estimate Pilots\u2019 Cognitive Workload. Front. Psychol., 12.","DOI":"10.3389\/fpsyg.2021.555446"},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"22","DOI":"10.1027\/2192-0923\/a000263","article-title":"Triggering Cockpit Alerts Using an Eye-Tracking-Based Measure of Monitoring Performance","volume":"14","author":"Schwerd","year":"2024","journal-title":"Aviat. Psychol. Appl. Hum. Factors"},{"key":"ref_15","doi-asserted-by":"crossref","unstructured":"Fu, B., De Jong, C., Guardado, N.G., Soriano, A.R., and Reyes, A. (2025, January 22). Event-Driven Predictive Gaze Analytics to Enhance Aviation Safety. Proceedings of the ACM on Human-Computer Interaction, New York, NY, USA.","DOI":"10.1145\/3725836"},{"key":"ref_16","unstructured":"Fu, B., Gatsby, P., Soriano, A.R., Chu, K., and Guardado, N.G. (2024, January 3). Towards Intelligent Flight Deck\u2014A Case Study of Applied Eye Tracking in The Predictions of Pilot Success and Failure During Simulated Flight Takeoff. Proceedings of the International Workshop on Designing and Building Hybrid Human\u2013AI Systems (SYNERGY 2024), Co-Located with the 17th International Conference on Advanced Visual Interfaces (AVI 2024), CEUR Vol-3701, Genoa, Italy."},{"key":"ref_17","doi-asserted-by":"crossref","unstructured":"Peysakhovich, V., Ledegang, W.D., Houben, M.M.J., and Groen, E.L. (2022, January 8\u201311). Classification of flight phases based on pilots\u2019 visual scanning strategies. Proceedings of the 2022 Symposium on Eye Tracking Research and Applications (ETRA \u201922), Seattle, WA, USA.","DOI":"10.1145\/3517031.3529641"},{"key":"ref_18","doi-asserted-by":"crossref","unstructured":"Zolfaghari, F., Papanikou, M., Kilikevicius, A., and Kale, U. (2026, January 12). Deep Learning-Based Classification of Expert and Novice Pilot Performance During Simulated Landings. Proceedings of the 4th International Conference on Cognitive Mobility CogMob 2025, Budapest, Hungary.","DOI":"10.1007\/978-3-032-13898-9_35"},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"61","DOI":"10.1080\/00140139.2019.1685132","article-title":"The instructor assistant system (iASSYST)\u2014Utilizing eye tracking for commercial aviation training purposes","volume":"63","author":"Rudi","year":"2020","journal-title":"Ergonomics"},{"key":"ref_20","doi-asserted-by":"crossref","unstructured":"Arjun, S., Hebbar, A., Vinod, S., and Biswas, P. (2022, January 8\u201311). Cognitive Load Dashboard for Flight Simulator. Proceedings of the 2022 Symposium on Eye Tracking Research and Applications (ETRA \u201922), Seattle, WA, USA.","DOI":"10.1145\/3517031.3529777"},{"key":"ref_21","first-page":"211","article-title":"A New Interface to Cope with Unreliable Airspeed Indications: A Behavioral and Eye-Tracking Study","volume":"12","author":"Fabre","year":"2022","journal-title":"Aviat. Psychol. Appl. Hum. Factors"},{"key":"ref_22","doi-asserted-by":"crossref","unstructured":"Fu, B. (2026). Eyes on the Approach: Eye Tracking Analysis of Pilot Scan Discipline During Simulated Instrument Landing System Approaches and Implications for Safety. Proceedings of the ACM on Human-Computer Interaction, Association for Computing Machinery.","DOI":"10.1145\/3806037"},{"key":"ref_23","unstructured":"Federal Aviation Administration (2026, September 01). Instrument Flying Handbook, Available online: https:\/\/www.faa.gov\/sites\/faa.gov\/files\/regulations_policies\/handbooks_manuals\/aviation\/FAA-H-8083-15B.pdf."},{"key":"ref_24","unstructured":"Federal Aviation Administration (2026, May 28). Instrument Rating-Airplane Airman Certification Standards, Available online: https:\/\/www.faa.gov\/sites\/faa.gov\/files\/training_testing\/testing\/acs\/instrument_rating_acs_change_1.pdf."},{"key":"ref_25","unstructured":"Federal Aviation Administration (2026, May 28). Airplane Flying Handbook, Available online: https:\/\/www.faa.gov\/sites\/faa.gov\/files\/regulations_policies\/handbooks_manuals\/aviation\/airplane_handbook\/00_afh_full.pdf."},{"key":"ref_26","unstructured":"Federal Aviation Administration (2026, May 28). Instrument Procedures Handbook, Available online: https:\/\/www.faa.gov\/sites\/faa.gov\/files\/regulations_policies\/handbooks_manuals\/aviation\/instrument_procedures_handbook\/FAA-H-8083-16B.pdf."},{"key":"ref_27","doi-asserted-by":"crossref","unstructured":"Fu, B., Chu, K., Soriano, A.R., Gatsby, P., Guardado, N.G., Jones, A., and Halderman, M. (2025). BEACH-Gaze: Supporting Descriptive and Predictive Gaze Analytics in the Era of Artificial Intelligence and Advanced Data Science. J. Eye Mov. Res., 18.","DOI":"10.3390\/jemr18060067"},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"191","DOI":"10.1109\/TBME.1983.325108","article-title":"Frequency limitations and optimal step size for the two-point central difference derivative algorithm with applications to human eye movement data","volume":"30","author":"Bahill","year":"1983","journal-title":"IEEE Trans. Biomed. Eng."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1145\/2834121","article-title":"Gaze transition entropy","volume":"13","author":"Krejtz","year":"2015","journal-title":"ACM Trans. Appl. Percept."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"415","DOI":"10.1016\/j.procir.2021.05.097","article-title":"Implementing innovative gaze analytic methods in design for manufacturing: A study on eye movements in exploiting design guidelines","volume":"100","author":"Doellken","year":"2021","journal-title":"Procedia CIRP"},{"key":"ref_31","doi-asserted-by":"crossref","unstructured":"Steichen, B., Wu, M.M.A., Toker, D., Conati, C., and Carenini, G. (2014, January 7\u201311). 2014 Te Te Hi, Hi Eye Gaze Sequence Analysis for Informing User-Adaptive Information Visualizations. Proceedings of the 22nd International Conference on User Modeling, Adaptation, and Personalization UMAP 2014, Aalborg, Denmark.","DOI":"10.1007\/978-3-319-08786-3_16"},{"key":"ref_32","doi-asserted-by":"crossref","unstructured":"West, J.M., Haake, A.R., Rozanski, E.P., and Karn, K.S. (2006, January 27\u201329). eyePatterns: Software for identifying patterns and similarities across fixation sequences. Proceedings of the 2006 Symposium on Eye Tracking Research & Applications, San Diego, CA, USA.","DOI":"10.1145\/1117309.1117360"}],"container-title":["Journal of Eye Movement Research"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1995-8692\/19\/5\/109\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,9,29]],"date-time":"2026-09-29T09:40:33Z","timestamp":1790674833000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1995-8692\/19\/5\/109"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2026,9,23]]},"references-count":32,"journal-issue":{"issue":"5","published-online":{"date-parts":[[2026,10]]}},"alternative-id":["jemr19050109"],"URL":"https:\/\/doi.org\/10.3390\/jemr19050109","relation":{},"ISSN":["1995-8692"],"issn-type":[{"value":"1995-8692","type":"electronic"}],"subject":[],"published":{"date-parts":[[2026,9,23]]}}}