Kazuyuki Samejima

Tamagawa University

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Trends

Author Order

Document Type

Co-Authors

Kenji Doya

Okinawa Institute of Science and Technology Graduate University

Minoru Kimura

Gunma University

J. Okuda

Osaka University of Pharmaceutical Sciences

Kosuke Sawa

Senshu University

Yasumasa Ueda

Kyoto Prefectural University of Medicine

Masamichi Sakagami

Tamagawa University

Kazuhiro Ueda

The University of Tokyo

Mitsuo Kawato

Advanced Telecommunications Research Institute International

Takashi Omori

Kyoto University

Yasuhiro Kato

Nippon Medical School

Cooperative Institutions

The University of Tokyo

Kyoto University

Tamagawa University

Japan Science and Technology Agency

Osaka University

Japan Society for the Promotion of Science

Hiroshima University

Advanced Telecommunications Research Institute International

National Institute of Information and Communications Technology

Nagoya University

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Field

Action value in the striatum and reinforcement-learning model of cortico-basal ganglia network

Neuroscience Research (2007)

Kazuyuki Samejima Yasumasa Ueda Kenji Doya Minoru Kimura

10.1016/j.neures.2007.06.127

Cite

Citations (2)

Interaction between human voice and horse gait transition in longeing traning

Journal of Veterinary Behavior (2016)

Keita NISHIYAMA M. Ohkita Kazuyuki Samejima Kosuke Sawa

Negative emotion

Position (finance)

10.1016/j.jveb.2016.08.057

Cite

Citations (3)

Lecture Note in ASCONE 2015 by Toshio Yamagishi “Ivan the Fool” and <i>homo economicus</i>: Two Basises of Social Order

The Brain & Neural Networks (2018)

Kazuyuki Samejima

2018年5月8日．山岸俊男先生が逝去された．3年前の2015年，山岸先生に無理を言って，神経科学の理論と実験の統合を目指す若手研究者のために講義をして欲しいと，当時玉川大学の先生のお部屋でお願いをした．山岸先生にはASCONE最終日に3時間以上にわたって講義をしていただいた．この解説記事は，先生のご研究やお考えを少しでも広く，長く伝えるために，私が書き起こしたASCONE講義録である．全て話し言葉でされた講義のため，一部勝手ながら私の解釈で要約した部分があり，不正確なところも見受けられるかもしれないが，ご容赦いただきたい．下記は山岸先生からASCONEの講義概要としていただいた要約である．

Homo economicus

10.3902/jnns.25.23

Cite

Citations (0)

Search for some transmissive social signals between intra-species -Toward a better understanding of mechanisms for developing intra-species bond-

The Proceedings of the Annual Convention of the Japanese Psychological Association (2015)

Kosuke Sawa Ayaka Takimoto Kazuyuki Samejima Fumihiro Kano Masaki Tomonaga

10.4992/pacjpa.79.0_ss-097

Cite

Citations (0)

A study of decision-making for delayed and probabilistic reward

Jōhō Shori Gakkai kenkyū hōkoku (2008)

Takehiko Yoshida Makoto Ito Tetsuro Morimura Kazuyuki Samejima J. Okuda

Source

Cite

Citations (0)

Brain mechanisms for evaluating probabilistic and delayed rewards

Neuroscience Research (2009)

Takehiko Yoshida Makoto Ito Tetsuro Morimura Kazuyuki Samejima J. Okuda

Binary decision diagram

Benchmark (surveying)

10.1016/j.neures.2009.09.1350

Cite

Citations (0)

A Comment on ^|^quot;On the interdisciplinary development of learning theories^|^quot;

Japanese Journal of Animal Psychology (2014)

Kazuyuki Samejima

10.2502/janip.64.2.3

Cite

Citations (0)

The effect of risk attitude on product choices

Cognitive Science (2011)

Ikuya Nomura Yasushi Onuki Kazuyuki Samejima Yuichi Washida Kazuhiro Ueda

The effect of risk attitude on product choices Ikuya Nomura The University of Tokyo Yasushi Onuki Tamagawa University Kazuyuki Samejima Tamagawa University Yuichi Washida Hakuhodo Inc. Kazuhiro Ueda The University of Tokyo JST, CREST Hiroyuki Okada Tamagawa University Takashi Omori Tamagawa University Abstract: Some people prefer to make risky decisions in their live, such as for avocation or even everyday decision making. Since Bauer first presented the conception of perceived risk in the decision making of consumer behavior, the role of perceived risk in product choice has attracted much attention and decisions such as choosing unknown objects have been known to be risky. Here in this study, we focused on how such risky decisions in product choices differ according to risk attitude and the faced situation under a virtual market situation. As a result, risk-takers consistently made risky choices while situation dependent behavior of risk-avoiders was observed. That is, the more unknown objects were presented, the less risky choices risk-avoiders selected. This result suggests that, in order to increase sales of a new product (unknown object), it is effective to lay it out with well known objects, not with other new products.

Source

Cite

Citations (0)

Characteristics of fast-spiking neurons in the striatum of behaving monkeys

Neuroscience Research (2015)

Hiroshi Yamada Hitoshi Inokawa Yukiko Hori Xiaochuan Pan Ryuichi Matsuzaki

Inhibitory interneurons are the fundamental constituents of neural circuits that organize network outputs. The striatum as part of the basal ganglia is involved in reward-directed behaviors. However, the role of the inhibitory interneurons in this process remains unclear, especially in behaving monkeys. We recorded the striatal single neuron activity while monkeys performed reward-directed hand or eye movements. Presumed parvalbumin-containing GABAergic interneurons (fast-spiking neurons, FSNs) were identified based on narrow spike shapes in three independent experiments, though they were a small population (4.2%, 42/997). We found that FSNs are characterized by high-frequency and less-bursty discharges, which are distinct from the basic firing properties of the presumed projection neurons (phasically active neurons, PANs). Besides, the encoded information regarding actions and outcomes was similar between FSNs and PANs in terms of proportion of neurons, but the discharge selectivity was higher in PANs than that of FSNs. The coding of actions and outcomes in FSNs and PANs was consistently observed under various behavioral contexts in distinct parts of the striatum (caudate nucleus, putamen, and anterior striatum). Our results suggest that FSNs may enhance the discharge selectivity of postsynaptic output neurons (PANs) in encoding crucial variables for a reward-directed behavior.

Putamen

Medium spiny neuron

Caudate nucleus

Ventral striatum

10.1016/j.neures.2015.10.003

Cite

Citations (32)

A reinforcement schedule with two of temporal information.

Yumi Hata Hiroshi Matsui Yoshio Iguchi Kazuyuki Samejima Kosuke Sawa

Decades of research on reinforcement schedules have demonstrated that temporal information regarding the arrival or nonarrival of biologically significant events controls animal behavior. The fixed interval (FI) schedule, which is a time-based reinforcement schedule, suggests that responses are regulated by the time elapsed since the last reinforcement. This raises the question of how behavior is controlled when two distinct temporal cues regarding the availability of reinforcers are simultaneously presented. We modified the random interval (RI) schedule to create a reinforcement schedule incorporating two types of temporal information: the time elapsed since the last reinforcement, and the inter-reinforcement interval (IRI). Through long-term operant conditioning in rats, we examined how temporal information controls responses. When two temporal cues were available, we found that behavior was influenced by each cue. Moreover, we discovered that the effects of these cues could be analytically separated within the dynamics of response rates. The findings revealed that in controlling behavior, living organisms can utilize two temporal cues rather than relying on a single, clear cue.

10.31234/osf.io/bm9ur

Cite

Citations (0)