Psychophysical and brain scientific approach to the numerosity judgment process in 3D stereoscopic space

• Project/Area Number: 17K18187
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Cognitive science; Experimental psychology
• Research Institution: Yamaguchi University (2019-2021); Tokyo University of Technology (2017-2018)
• Principal Investigator: Aida Saori 山口大学, 大学院創成科学研究科, 助教(テニュアトラック) (80746983)
• Project Period (FY): 2017-04-01 – 2022-03-31
• Project Status: Completed (Fiscal Year 2021)
• Budget Amount: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000); Fiscal Year 2020: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2019: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2018: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2017: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
• Keywords: 数量知覚 / 3次元知覚 / 奥行き知覚 / 両眼立体視 / 両眼視差 / 数量判断 / numerosity / 認知科学 / 奥行き / 数量認知 / 立体透明視 / 数量 / 知覚心理学

Outline of Final Research Achievements

This study is about numerosity judgments in 3-D space. The number of elements was perceived to be higher in the 3-D stimulus than in the 2-D stimulus even when their physical numbers were identical to each other. To account for the 3-D overestimation phenomenon, we proposed a new hypothesis that processing disparities of elements in a 3-D stimulus interferes with the numerosity estimation of the elements.

Academic Significance and Societal Importance of the Research Achievements

本研究は、3次元空間での人間の視覚特性をより深く理解しようとするものである。従来の数量推定に関する研究では、2次元刺激が多く用いられてきた。人間の生活空間が主に3次元であることを考えると、3次元空間での数量推定を研究することは、人間の知覚行動特性を知る上で重要である。研究の結果、刺激を観察した時、構成要素の両眼視差の処理が構成要素の数量推定過程に干渉していることが示唆された。

Research Products

• [Journal Article] Interaction of disparity size and depth structure on perceived numerosity in a three-dimensional space (2020)
  • Author(s): Aida Saori, Matsuda Yusuke, Shimono Koichi
  • Journal Title: PLOS ONE Volume: 15 Issue: 4 Pages: e0230847-e0230847
  • DOI: 10.1371/journal.pone.0230847
  • Peer Reviewed / Open Access
• [Presentation] Does numerosity adaptation affect numerosity judgments of 3-D stimuli? (2021)
  • Author(s): Saori Aida, Koichi Shimono
  • Organizer: European Conference on Visual Perception
  • Int'l Joint Research
• [Presentation] Overlapping surfaces are not necessary for overestimation of the number of elements in a three-dimensional stimulus (2019)
  • Author(s): Aida Saori, Matsuda Yusuke, Shimono Koichi
  • Organizer: European Conference on Visual Perception (ECVP)
  • Int'l Joint Research
• [Presentation] 3次元数量過大推定現象に及ぼす奥行き構造の効果 (2019)
  • Author(s): 相田紗織，松田勇祐，下野孝一
  • Organizer: 日本視覚学会
• [Presentation] 3次元数量過大推定現象は要素提示範囲に依存する (2018)
  • Author(s): 下野孝一， 松田勇祐，相田紗織
  • Organizer: 日本心理学会
• [Presentation] 3次元数量過大推定現象に関する遮蔽仮説の検討 (2018)
  • Author(s): 相田紗織，下野孝一
  • Organizer: 21世紀科学と人間シンポジウム
• [Presentation] 3 次元数量過大推定現象に関する遮蔽仮説と背景面バイアス仮説の検討 (2017)
  • Author(s): 相田紗織，松田勇祐，下野孝一
  • Organizer: 日本基礎心理学会