{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,25]],"date-time":"2026-03-25T17:04:13Z","timestamp":1774458253109,"version":"3.50.1"},"reference-count":40,"publisher":"MDPI AG","issue":"2","license":[{"start":{"date-parts":[[2024,1,29]],"date-time":"2024-01-29T00:00:00Z","timestamp":1706486400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"JSPS KAKENHI","award":["21H05796"],"award-info":[{"award-number":["21H05796"]}]},{"name":"JSPS KAKENHI","award":["23H04430"],"award-info":[{"award-number":["23H04430"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["J. Imaging"],"abstract":"<jats:p>Head-mounted displays (HMDs) are becoming more and more popular as a device for displaying a virtual reality space, but how real are they? The present study attempted to quantitatively evaluate the degree of reality achieved with HMDs by using a perceptual phenomenon as a measure. Lightness constancy is an ability that is present in human visual perception, in which the perceived reflectance (i.e., the lightness) of objects appears to stay constant across illuminant changes. Studies on color\/lightness constancy in humans have shown that the degree of constancy is high, in general, when real objects are used as stimuli. We asked participants to make lightness matches between two virtual environments with different illuminant intensities, as presented in an HMD. The participants\u2019 matches showed a high degree of lightness constancy in the HMD; our results marked no less than 74.2% (84.8% at the maximum) in terms of the constancy index, whereas the average score on the computer screen was around 65%. The effect of head-tracking ability was confirmed by disabling that function, and the result showed a significant drop in the constancy index but that it was equally effective when the virtual environment was generated by replay motions. HMDs yield a realistic environment, with the extension of the visual scene being accompanied by head motions.<\/jats:p>","DOI":"10.3390\/jimaging10020036","type":"journal-article","created":{"date-parts":[[2024,1,29]],"date-time":"2024-01-29T12:25:01Z","timestamp":1706531101000},"page":"36","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["The Reality of a Head-Mounted Display (HMD) Environment Tested via Lightness Perception"],"prefix":"10.3390","volume":"10","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9981-9339","authenticated-orcid":false,"given":"Ichiro","family":"Kuriki","sequence":"first","affiliation":[{"name":"Graduate School of Science and Engineering, Saitama University, Saitama 338-8570, Japan"}]},{"given":"Kazuki","family":"Sato","sequence":"additional","affiliation":[{"name":"Graduate School of Information Sciences, Tohoku University, Sendai 980-8579, Japan"}]},{"given":"Satoshi","family":"Shioiri","sequence":"additional","affiliation":[{"name":"Graduate School of Information Sciences, Tohoku University, Sendai 980-8579, Japan"},{"name":"Research Institute of Electrical Communication, Tohoku University, Sendai 980-8570, Japan"}]}],"member":"1968","published-online":{"date-parts":[[2024,1,29]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"13821","DOI":"10.1073\/pnas.1922294117","article-title":"The limits of color awareness during active, real-world vision","volume":"117","author":"Cohen","year":"2020","journal-title":"Proc. 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