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記事タイトル
波長可変光源を用いたipRGC の知覚への影響
発刊年月日
2026年11月　Vol.110　第6号
著者名
堀内 隆彦
企業・団体名
千葉大学大学院 情報学研究院
記事種別
特集資料・講演など
抄録（ABSTRACT）
Intrinsically photosensitive retinal ganglion cells (ipRGCs) are known to contribute to non-image-forming visual functions such as circadian photoentrainment and pupillary responses. More recently,their involvement in visual perception,including color and brightness perception,has also attracted attention. However,evaluating their perceptual contribution remains challenging because multiple photoreceptor systems respond simultaneously to optical stimulation. This article reviews our laboratory's approach to investigating perceptual effects of ipRGC stimulation using a wavelength-controllable spectral projector system. First,we describe a stimulus generation method based on independent photoreceptor control and the design of pentamic metameric stimuli. Next,experimental findings on color discrimination under central and peripheral viewing conditions are presented,suggesting a supplementary contribution of ipRGC stimulation to color perception. Finally,recent studies examining wavelength- and visual-field- dependent influences on the luminance pathway are introduced. The results indicate that ipRGC signals may not form an independent perceptual channel but instead modulate existing visual pathways involved in human perception.
図表タイトル

図１ 分光プロジェクタの構造 Fig.1 Structure of our multi-spectral projector.
図２ ipRGCメタメリック刺激対の設計概念 Fig.2 Design concepts for ipRGC metameric stimulus pairs.
図３ ipRGCメタメリック刺激対の例．（a）〜（d）にかけて,ipRGC の刺激量が1 %,2 %,3 %,4 %異なっている Fig.3 Examples of ipRGC-metameric stimulus pairs. From （a） to （d）,the ipRGC stimulation levels differ by 1 %,2 %,3 %,and 4 %.
図４ 中心視の色弁別実験の結果例．（a）ipRGC刺激量の変化に対する弁別率,（b）刺激色の色相の変化に対する弁別率 Fig.4 Example results of a color discrimination experiment under central vision. （a） Discrimination rate as a function of changes in the ipRGC stimulation level,and （b） discrimination rate as a function of changes in the hue of the stimulus color.
図５ ipRGCメタメリック刺激対の例．（a）短波長寄り刺激,（b）長波長寄り刺激．それぞれ緑線の刺激を基準として,赤線が ipRGCの刺激量を増加させ,青線がipRGCの刺激量を減少させた例である Fig.5 Example of ipRGC-metameric stimulus pairs: （a） shortwavelength-side stimulus,（b） long-wavelength-side stimulus. In each case,the green line represents the reference stimulus,while the red and blue lines represent stimuli with increased and decreased levels of ipRGC stimulation,respectively.

キーワード
波長可変光源 | 色知覚 | 輝度知覚 | Silent substitution | wavelength-tunable light source | spectral projector | color perception | luminance perception | silent | substitution | 分光プロジェクタ | ipRGC

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