Hello! I am currently a postdoc interested in the psychological mechanisms underlying human aggression and its development.
๐ Google Scholar /ย ResearchGate / researchmap / ORCID / Bluesky (mainly in English) / X (mainly in Japanese) / academist (academic crowdfunding project)
โ๏ธ yamamoto.nozomi.hus [at] osaka-u.ac.jp / nozomiyamamot [at] gmail.comย
๐ซ Developmental Cognitive Science Lab at The University of Osaka, Japan
2026.8.ใOur crowdfunding project on academist (Link), which ran for around a year, has now come to an end. Whilst the research continues, we would like to thank everyone who supported us!
2026.8.ใA paper proposing a new method for measuring childrenโs inner speech has been published in Acta Psychologica.
Otani, K., Watanabe, R., Kuwamizu, R., Yamamoto, N., & Moriguchi, Y. (2026). The developmental origin of inner speech: Evidence from a mental counting task in 3- to 6-year-old children. Acta Psychologica, 270(107716), 107716. https://doi.org/10.1016/j.actpsy.2026.107716ย
2026.7.ใSelected for New Investigators Program by the International Society for Research on Aggression (ISRA) and gave a poster presentation at ISRA WORLD MEETING 2026 (ISRA2026).
[Poster] Yamamoto, N. & Moriguchi, Y. (July 21โ23, 2026). Do Aggressive Responses Differ Between Ostracism vs Rejection?: Preliminary Ongoing Study with Arranged-Cyberball. ISRA WORLD MEETING 2026 (ISRA2026), Canada.
2026.8.ใacademistใงใฎ็ด1ๅนด้ใซใใใใฏใฉใใกใณใใญใธใงใฏใ (Link) ใ็ตไบใใพใใใ็ ็ฉถใฏใพใ ใพใ ็ถใใพใใใใๆฏๆดใใใ ใใ็ใใพใใใใใจใใใใใพใใ๏ผ
2026.8.ใๅญใฉใใฎๅ ่จใฎๆฐใใๆธฌๅฎๆนๆณใๆๆกใใ่ซๆ๏ผๅ ฑ่๏ผใActa Psychologica่ชใซๆฒ่ผใใใพใใใ
Otani, K., Watanabe, R., Kuwamizu, R., Yamamoto, N., & Moriguchi, Y. (2026). The developmental origin of inner speech: Evidence from a mental counting task in 3- to 6-year-old children. Acta Psychologica, 270(107716), 107716. https://doi.org/10.1016/j.actpsy.2026.107716ย
2026.7.ใInternational Society for Research on Aggression (ISRA) ใฎNew Investigators Programใซๆกๆใใใ ใใพใใใใพใใISRA WORLD MEETING 2026 (ISRA2026) ใงใในใฟใผ็บ่กจใ่กใใพใใใ
[ใในใฟใผ] Yamamoto, N. & Moriguchi, Y. (July 21โ23, 2026). Do Aggressive Responses Differ Between Ostracism vs Rejection?: Preliminary Ongoing Study with Arranged-Cyberball. ISRA WORLD MEETING 2026 (ISRA2026), Canada.
My research focuses on the psychological mechanisms underlying human aggression and its development. I use questionnaires and experiments to investigate this topic. My long-term goal is to understand the reasons behind aggressive behaviour and how we can manage it in our daily lives. Furthermore, I'm also broadly interested in children's social cognition and its development.
Keywords: Aggression, social exclusion, hostile cognition, emotion, facial expression, culture, eye blinking, and more.
ใใใฎๆปๆ่กๅใใใฉใฎใใใชๅฟ็็ใกใซใใบใ ใซๆฏใใใใฆใใใใฉใฎใใใซ็บ้ใใใฎใใซใคใใฆใใขใณใฑใผใ่ชฟๆปใๅฎ้จ็ๆๆณใ็จใใฆๆค่จใใฆใใพใใใใใใฎๆค่จใ้ใใฆใใชใใใใฏๅทใคใๅใใใจใใใใฎใใปๆฅๅธธ็ๆดปใฎไธญใงใใใใจใฉใไปใๅใฃใฆใใในใใ่ใใฆใใใใใงใใใพใใๆปๆ่กๅใ ใใงใชใใๅญใฉใใฎ็คพไผ็่ช็ฅใใใฎ็บ้ใซใคใใฆใๅบใ้ขๅฟใใใใพใใ
ใญใผใฏใผใ: ๆปๆๆงใ็คพไผ็ๆ้คใๆตๅฏพ็่ช็ฅใๆๆ ใ่กจๆ ใๆๅใ็ฌ็ฎใชใฉใ
Reactive aggression refers to aggressive behavior that occurs in response to some threats and provocations caused by a preceding event. It often involves emotions like anger and a retaliatory motive toward the person.
One antecedent that triggers reactive aggression is the interpretation of being targeted with hostility (threat) by others. For example, imagine playing catch with two other people (A and B). If A and B suddenly stop throwing the ball to you, many people would interpret their actions as hostile and become more likely to behave aggressively toward them.
Yamamoto et al. (2025; Experiment 2) demonstrated that the ability to interpret such behavior as hostile develops between the ages of 4 and 6. Yamamoto & Moriguchi (2025) showed that aggressive behavior toward individuals who stop throwing the ball is observable in 5- to 6-year-olds.
Furthermore, individuals with high levels of everyday reactive aggression are known to exhibit a cognitive bias: they tend to attribute hostility to others (i.e., they are more likely to interpret others as having hostile intentions toward them). For instance, if someone (Person A) accidentally steps on their foot while walking down the street, individuals with high reactive aggression are more prone to interpret that A intentionally stepped on them with hostile intent, compared to those with lower reactive aggression. Consequently, they are more likely to behave aggressively toward A for self-defense or retaliation.
Regarding this cognitive mechanism, Yamamoto et al. (2023) conducted a study with Japanese children ranging from preschool to elementary school age. The study revealed a weak positive correlation between the bias to attribute hostility to others and aggression. Additionally, hyperactivity was suggested to play a particularly important mediating role in this relationship.
ๅๅฟ็ใชๆปๆใจใฏใไฝใใใฎ่ ๅจใๆ็บใซๅฏพใใฆๅๅฟ็ใซ่ตทใใๆปๆ่กๅใฎใใจใงใใๆใใชใฉใฎๆๆ ใไผดใฃใใใ็ธๆใธใฎๅ ฑๅพฉ็ใชๅๆฉใๆใฃใฆใใใใใใใจใ็นๅพดใงใใ
ใใฎใใใชๅๅฟ็ใชๆปๆ่กๅใๅฐใ่ฆๅ ใฎใฒใจใคใจใใฆใ่ชๅใไป่ ใใๆตๆ๏ผ่ ๅจ๏ผใๅใใใใฆใใใจๆใใ็ถๆณใๆใใใใพใใใใจใใฐใ่คๆฐใฎไป่ ๏ผAใใใปBใใ๏ผใจใญใฃใใใใผใซใใใฆใใใจใใ้ไธญใใ่ชๅใซใ ใใใผใซใๅใฃใฆใใชใใชใฃใใใๅคใใฎไบบใฏใAใใใปBใใใ่ชๅใซๅฏพใใฆๆตๅฏพ็ใชๆๅณใๆใฃใฆใใ๏ผโ่ ๅจ็๏ผใจ่ใใๅฝผใใซๅใใฃใฆๆปๆ็ใซๆฏใ่ใใใใใชใใใจใๅใใฃใฆใใพใใ
Yamamoto et al. (2025; ๅฎ้จ2) ใงใฏใไธ่จใฎใใใชใญใฃใใใใผใซใฎ็ถๆณใซใใใฆใใใผใซใๅใใฆใใชใใชใฃใไป่ ใๆตๅฏพ็ใจ่ฉไพกใใๅใฏ4-6ๆญณใซใใใฆ็บ้ใใใใจใ็คบใใพใใใใใใซใ5-6ๆญณๅ ใๅฏพ่ฑกใจใใYamamoto & Moriguchi (2025) ใงใฏใใใฎใใผใซใๅใใฆใใชใใชใฃใไป่ ใซๅฏพใใฆๆปๆ็ใชๅๅฟใใฟใใใใใจใ็คบใใพใใใ
ๆฅๅธธ็ๆดปใซใใใฆๅๅฟ็ใชๆปๆๆงใ้ซใๅไบบใฏใใใฎ่ช็ฅ็ใกใซใใบใ ใจใใฆใไป่ ใซๆตๆใๅธฐๅฑใใใใ๏ผโไป่ ใ่ชๅใซๅฏพใใฆๆตๆใๆใฃใฆใใใจๆใใใใ๏ผใใคใขในใๆใคใใจใๅใใฃใฆใใพใใใใจใใฐใ้ใๆญฉใใฆใใฆ่ชฐใ๏ผAใใ๏ผใซ่ถณใ่ธใพใใใจใใๅๅฟ็ใชๆปๆๆงใ้ซใๅไบบใฏใใใใงใชใๅไบบใใใใAใใใ่ชๅใซๅฏพใใฆๆตๅฏพ็ใชๆๅณใๆใฃใฆ่ธใใ ใฎใ ใจ่ใใใใใใใใใใ่ชๅทฑ้ฒ่กใๅ ฑๅพฉใ็ฎ็ใซใAใใใซๅฏพใใฆๆปๆ็ใซๆฏใ่ใใใใใจ่ใใใใฆใใพใใ
ใใฎ่ช็ฅ็ใกใซใใบใ ใซ้ขใใฆใYamamoto et al. (2023) ใงใฏใๆฅๆฌใฎๅนผๅ ๆใใๅ ็ซฅๆใฎใๅญใใพใๅฏพ่ฑกใซ่ชฟๆปใใพใใใ่ชฟๆปใฎ็ตๆใไป่ ใซๆตๆใๅธฐๅฑใใใใใใคใขในใจๆปๆๆงใฎ้ใซๅผฑใๆญฃใฎ็ธ้ขใใฟใใใพใใใใพใใใใฎ้ข้ฃใฎๅชไปๅ ๅญใจใใฆใๅคๅๆงใใ็นใซ้่ฆใชๅฝนๅฒใๆใใใฆใใใใจใ็คบๅใใใพใใใ