Published papers

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

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

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

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

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

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.

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.

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.