Papers - Nakatani, Masashi

With a Hint of Sudachi: Food Plating Can Facilitate the Fondness of Food

Kokaji N, Nakatani M.

Front Psychol. 2021 Oct   2021.10

Joint Work

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食品の置き方の見た目が食欲をどのように喚起するかのヒト感性構造を論じた研究

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3Dプリントプロダクト価値創出設計のためのAshby Mapに基づくArchitected Materialデータベースの構築

岡崎 太祐，淺野 義弘，櫻井 智子，佐倉 玲，島田 旭緒，仲谷 正史 ，田中 浩也

The Journal of 4D and Functional Fabrication  2021.10

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3Dプリントで製造した造形物の硬さ計測とメタマテリアル構造との関係を論じた研究

Temporal coherency of mechanical stimuli modulates tactile form perception

Nakatani M, Kobayashi Y, Ohno K, Uesaka M, Mogami S, Zhao Z, Sushida T, Kitahata H, Nagayama M.

Scientific Reports  2021.06

Research paper (scientific journal), Joint Work, Lead author, Corresponding author, Accepted

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自身の見つけた魚骨錯覚がヒト指先の皮膚感覚神経で引き起こす時空間応答パターンについて数理モデルで検討した結果を論じた

Mechanical Properties and Reliability of Parametrically Designed Architected Materials Using Urethane Elastomers

Morita J, Ando Y, Komatsu S, Matsumura K, Okazaki T, Asano Y, Nakatani M, Tanaka H.

Polymers 2021  13 ( (5) ) 842 2021.03

Joint Work

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3Dプリンタで製造したメタマテリアル構造とその機械的繰り返し耐久度を論じた

Sensory words may facilitate certain haptic exploratory procedures in facial cosmetics

Arakawa N, Watanabe T, Fukushima K, Nakatani M.

Int J Cosmet Sci. 43 ( (1) ) 78 - 87 2021.02

Joint Work

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化粧品を評価する感性ワードと、それが誘引する触探索動作との関係について論じた

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EXPRESS: Dark, loud, and compact sounds induce frisson

Takuya Koumura, Masashi Nakatani, Hsin-I Liao, Hirohito M Kondo

Quarterly Journal of Experimental Psychology  2020.11

Research paper (scientific journal), Joint Work

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Frisson is characterized by tingling and tickling sensations with positive or negative feelings. However, it is still unknown what factors affect the intensity of frisson. We conducted experiments on the stimulus characteristics and individual's mood states and personality traits. Participants filled out self-reported questionnaires, including the Profile of Mood States, Beck Depression Inventory, and Big Five Inventory. They continuously indicated the subjective intensity of frisson throughout a 17-min experiment while listening to binaural brushing and tapping sounds through headphones. In the interviews after the experiments, participants reported that tingling and tickling sensations mainly originated on their ears, neck, shoulders, and back. Cross-correlation results showed that the intensity of frisson was closely linked to the acoustic features of auditory stimuli, including their amplitude, spectral centroid, and spectral bandwidth. This suggests that proximal sounds with dark and compact timbre trigger frisson. The peak of correlation between frisson and the acoustic feature was observed 2 s after the acoustic feature changed, suggesting that bottom-up auditory inputs modulate skin-related modalities. We also found that participants with anxiety were sensitive to frisson. Our results provide important clues to understanding the mechanisms of auditory-somatosensory interactions.

Keywords: autonomous sensory meridian response (ASMR); frisson; hearing; interaural level difference; proximal space; somatosensory.

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Sensory words may facilitate certain haptic exploratory procedures in facial cosmetics

Naomi Arakawa, Tomoko Watanabe, Kyoko Fukushima, Masashi Nakatani

International Journal of Cosmetic Science  2020.11

Research paper (scientific journal), Joint Work

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Objective: Many people want to have healthy facial skin. They tend to check their skin's condition by touching their face with their hands. In the cosmetic industry, we need to understand what consumers are perceiving in a tactile sense when touching their own facial skin. The purpose of this study was to investigate these observation methods in order to systematically understand people's haptic exploratory procedures (HEPs).

Methods: Thirty-four participants living in the US and twenty-two participants living in Japan freely explored their faces and answered which side felt more closely related to the six tactile adjectives. A new analysis was applied to classify the observed HEPs into six classifications within two categories and three sizes of contact area by experts.

Result: It was confirmed that the new task was useful to observe the HEPs for participants from US and Japan. The US participants' HEPs for "moisturized" were mainly a middle-sized contact area using a stroking motion. On the other hand, Japanese participants' HEPs for "moisturized" ("shittori" in Japanese) mainly used a pushing movement. Moreover, the US participants' HEPs for "soft" included both pushing and stroking, but Japanese participants HEPs for "soft" ("yawarakai" in Japanese) were again mainly pushing.

Conclusion: This study suggests that the proposed analysis method enables the systematic understanding of HEPs when checking the skin, along with the cross-cultural differences affecting those procedures. These systematic findings could allow cosmetic formulators to have a better understanding of the tactile sensations consumers themselves are feeling in a variety of different global markets.

Keywords: cosmetic cultures; effectiveness of products; hand movement; haptic exploratory procedures; sensory evaluation; sensory words.

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Comprehensive analysis of elemental distribution in human skin using laser ablation inductively coupled plasma mass spectrometry

Shinobu Nakanishi, Rie Kamezono, Masashi Nakatani, Mitsuhiro Denda

Skin Research and Technology  2020.10

Research paper (scientific journal)

Architected Materialを用いた感性ベースの構造デザイン手法─カスタムインソールの3Dディジタル設計に向けて─

森田 淳, 小松 敏, 光部 貴士, 中村 和洋, 川瀬 領治, 仲谷 正史, 田中 浩也

デジタルプラクティス 11 ( 2 ) 434 - 455 2020.04

Research paper (scientific journal), Joint Work, Accepted

Proximal Binaural Sound Can Induce Subjective Frisson

Shiori Honda, Yuri Ishikawa, Rei Konno, Eiko Imai, Natsumi Nomiyama, Kazuki Sakurada, Takuya Koumura, Hirohito M. Kondo, Shigeto Furukawa, Shinya Fujii, Masashi Nakatani

Frontiers in Psychology (Frontiers)  11 2020.03

Research paper (scientific journal), Joint Work, Accepted,  ISSN  1664-1078

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This study addressed a question whether a proximal sound recorded by a binaural microphone can induce subjective frisson (the feeling of chill), and explored possible acoustic features of the sound source. A proximal sound is one of major components of the sound that can induce autonomous sensory meridian responses (ASMR), therefore this paper also describes possible relationship between sound frisson and ASMR inducing sounds.

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Dynamics and Perception in the Thermal Grill Illusion

Shriniwas Patwardhan, Anzu Kawazoe, David Kerr, Masashi Nakatani, Yon Visell

IEEE Transactions on Haptics, 2019, DOI: 10.1109/TOH.2019.2904226 (Early Access) (IEEE Transactions on Haptics)  12 ( 4 ) 604 - 614 2019.03

Joint Work, Accepted,  ISSN  19391412

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© 2019 IEEE. A basic challenge in perception research is to understand how sensory inputs from physical environments and the body are integrated in order to facilitate perceptual inferences. Thermal perception, which arises through heat transfer between extrinsic sources and body tissues, is an integral part of natural haptic experiences, and thermal feedback technologies have potential applications in wearable computing, virtual reality, and other areas. While physics dictates that thermal percepts can be slow, often unfolding over timescales measured in seconds, much faster perceptual responses can occur in the thermal grill illusion. The latter refers to a burning-like sensation that can be evoked when innocuous warm and cool stimuli are applied to the skin in juxtaposed fashion. Here, we show that perceptual response times to the thermal grill illusion decrease systematically with perceived intensity. Using results from behavioral experiments in combination with a physics-based description of tissue heating, we develop a simple model explaining the perception of the illusion through the evolution of internal tissue temperatures. The results suggest that improved understanding of the physical mechanisms of tissue heating may aid our understanding of thermal perception, as exemplified by the thermal grill illusion, and might point toward more efficient methods for thermal feedback.

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Baby Touch: Quantifying Visual-Haptic Exploratory Behaviors in Infants of Sensory-Motor Development

Sakurada K., Oka A., Kiso R., Shimabukuro L., Ueno A., Nakatani M.

Lecture Notes in Electrical Engineering (Lecture Notes in Electrical Engineering)  535   241 - 246 2019

ISSN  9789811331930

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© 2019, Springer Nature Singapore Pte Ltd. We propose a method to quantify an infant’s exploratory behavior by taking a video of his/her actions and analyzing them. Exploratory behaviors of infants are known to be necessary for the development of cognitive functions and language acquisition. Multiple studies on exploratory behaviors have been conducted; however, exploratory behaviors of infants have been commonly classified and quantified manually, requiring ample efforts. Advances in computer vision research using machine learning in recent years have made it possible to automatically analyze captured videos and register movements of the human body. In this study, we developed a measurement system that enables the quantification of exploratory behaviors of infants by combining OpenPose, OpenFace, and a computer vision library. First, we created a video-capturing environment suitable for capturing an infant’s behavior. Second, we integrated the computer vision library to analyze infants fixating on and touching objects placed in front of them. As a result, we are now able to quantify some aspects of infants’ exploratory behavior. Our measurement system will be useful for investigating the exploratory behavior of six to fifteen-month old children using visual-haptic modalities, and also it will also be valuable in comprehending the developmental stages of each child.

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The Thermal Feedback Influencer: Wearable Thermal Display for Enhancing the Experience of Music Listening

Ishikawa Y., Kawazoe A., Chernyshov G., Fujii S., Nakatani M.

Lecture Notes in Electrical Engineering (Lecture Notes in Electrical Engineering)  535   162 - 168 2019

ISSN  9789811331930

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© 2019, Springer Nature Singapore Pte Ltd. This paper describes a new wearable thermal display, the Thermal Feedback Influencer, that can provide chilling stimuli to the skin in order to enhance emotional experiences of music listening. We developed a prototype device that can be attached to behind the ear. The device is designed to be small and lightweight enough to be worn comfortably. In this work, we describe basic concepts of this research, preliminary test results, details and evaluation of the developed prototype. We also summarize methods to provide thermal feedback with music and discuss the possible applications and future research plans.

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A novel multimodal tactile module that can provide vibro-thermal feedback

Nakatani M., Sato K., Sato K., Kawana Y., Takai D., Minamizawa K., Tachi S.

Lecture Notes in Electrical Engineering (Lecture Notes in Electrical Engineering)  432   437 - 443 2018

ISSN  9789811041563

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© Springer Nature Singapore Pte Ltd. 2018. This paper describes a novel tactile module that can provide both vibratory and thermal feedback onto the skin. The module is composed of two different components; miniaturized vibrator and four units of Peltier devices. The dimension of the vibro-thermal tactile feedback device is 16 × 32 × 7 mm, which is small enough for attaching to fingerpad. We describe basic concept of this module, and the state of current prototype including possible applications.

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TECHTILE workshop for creating haptic content

M Nakatani, Y Kakehi, K Minamizawa, S Mihara, S Tachi

Pervasive Haptics, 185-200  2016

Distinctive molecular responses to ultraviolet radiation between keratinocytes and melanocytes

X Sun, A Kim, M Nakatani, Y Shen, L Liu

Experimental dermatology 25 (9), 708-713 25 ( 9 ) 708 - 13 2016

ISSN  0906-6705

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Mechanotransduction in epidermal Merkel cells

M Nakatani, S Maksimovic, Y Baba, EA Lumpkin

Pflügers Archiv-European Journal of Physiology 467 (1), 101-108 467 ( 1 ) 101 - 8 2015

ISSN  0031-6768

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触感表現の一般普及に向けた方法論とテクタイルワークショップを通したその実践

仲谷正史, +筧康明+, 南澤孝太+, 三原聡一郎+,舘暲 (+ Equal contribution)

日本バーチャルリアリティ学会論文誌 19 ( 4 ) 593 - 603 2014.12

Joint Work, Accepted

Epidermal Merkel cells are mechanosensory cells that tune mammalian touch receptors

Srdjan Maksimovic+, Masashi Nakatani+, Yoshichika Baba+, Aislyn M. Nelson, Kara L. Marshall, Scott A. Wellnitz, Pervez Firozi, Seung-Hyun Woo, Sanjeev Ranade, Ardem Patapoutian, Ellen A. Lumpkin (+ Equal contribution)

Nature 509 ( 7502 ) 617 - 621 2014.04

Research paper (scientific journal), Joint Work, Lead author, Accepted,  ISSN  0028-0836

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Coculture system of keratinocytes and dorsal-root-ganglion-derived cells for screening neurotrophic factors involved in guidance of neuronal axon growth in the skin

Junichi Kumamoto+, Masashi Nakatani+*, Moe Tsutsumi, Makiko Goto, Sumiko Denda, Kentaro Takei, Mitsuhiro Denda (+ Equal contribution, * Corresponding)

Experimental Dermatology 23 ( 1 ) 58 - 60 2014.01

Joint Work, Accepted,  ISSN  0906-6705

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