Modeling for affective material perception by pupillary response

2022 Fiscal Year Final Research Report

• Project/Area Number: 21K21315
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Multi-year Fund
• Review Section: 1002:Human informatics, applied informatics and related fields
• Research Institution: Toyohashi University of Technology
• Principal Investigator: Tamura Hideki 豊橋技術科学大学, 工学(系)研究科(研究院), 助教 (40908612)
• Project Period (FY): 2021-08-30 – 2023-03-31
• Keywords: 質感 / 瞳孔 / 光沢感 / 魅力 / 線形混合効果モデル / 画像特徴量

Outline of Final Research Achievements

This study aimed to clarify the characteristics of pupil response that correspond to material perception and develop a predictive model for them. We conducted a psychophysical experiment simultaneously measuring perceived glossiness and pupil diameter. As a result, we found that the pupils constricted when observing stimuli with higher glossiness ratings. Moreover, a linear mixed-effects model identified that the high gloss rating and high variance of luminance histogram significantly predicted pupil changes. These findings suggest that the cognitive aspect of a “shiny appearance,” resulting from specular highlights on the object’s surface, leads to pupil constriction.

Free Research Field

感性情報学

Academic Significance and Societal Importance of the Research Achievements

本研究は，光沢感の持つ認知的要因が瞳孔径変化にどのような影響を与えるかを初めて明らかにしたものである．今回発見した質感知覚と瞳孔反応の関係性から，瞳孔径を外部から輝度変化させることでその大きさを調整させ，質感知覚を変調できるようにかもしれない．こうしたアプローチは，視覚系における質感認知の階層構造モデル仮説の検証に有効である．加えて，観察者の瞳孔反応からどのようなモノに対して心を動かされているかを推定できるようになれば，より良いものづくり，マーケティング，デザインにも寄与できる．