The Influence of Group Situation and Members’ Identity on the Leadership Preference

This study examined the mediation effects of group members’ identity for the relationship between the group situation and their leadership preference. We focused on two dimensions of leadership: individualized – deindividualized, and task oriented - relational oriented. We hypothesized that members’ collective identity may be salient in the intergroup comparison situation (H1), relational identity may be salient in the intragroup cooperation situation (H2), and individual identity may be salient in the intragroup comparison situation (H3). And we hypothesized that the member with salient individual identity may not need any leader (H4), the members with salient relational identity may prefer to an individualized relational oriented leader (H5), and the members with salient collective identity may prefer to a deindividualized task oriented leader (H6). In study 1, the results of a laboratory experiment showed the support to hypothesis 1-3. In study 2, although hypothesis 4 was not able to examined, hypothesis 5 and 6 were partially supported from the results of investigation. Finally, contributions and limits of this study were discussed.本論文は，第1著者が広島大学大学院総合科学研究科に提出した2008年度修士論文の一部に加筆・修正を行ったものである。 また，本研究は第2著者を研究代表者とする日本学術振興会科学研究費補助金（基盤研究C）の助成を受けて行われた

Use of cue stimulus during temporal discrimination in rats.

A series of experiments examined the observing responses as the usage of a cue stiumlus during temporal discrimination learning. The observing response was defined as pressing a lever which presented a cue stimulus but not contingent reinforcers. Five food deprived rats were examined using differential reinforcement of long latencies (DRLL) schedule with a two levers operant chamber. In the first procedure which was presented flicker stimuli automatically, acquired reinforcement effectively. The results showed that flicker stimulus became cue stimulus. The second procedure required a observing response to present a cue stimulus. However, boserving response appeared little numbers. Next, we used more difficult procedures than the secong one. These schedules have long DRLL value. In such schedules, the number of observing responses were more than that in easy schedule

Radiation exposure and circulatory disease risk: Hiroshima and Nagasaki atomic bomb survivor data, 1950-2003

Objective To investigate the degree to which ionising radiation confers risk of mortality from heart disease and stroke

免疫組織化学法を用いた一側内耳破壊ラットの前庭代償の新しい評価法の開発

Background: Unilateral labyrinthectomy (UL) causes the disappearance of ipsilateral medial vestibular nuclear (ipsi-MVe) activity and induces spontaneous nystagmus (SN), which disappears during the initial process of vestibular compensation (VC). Ipsi-MVe-activity restores in the late process of VC. Objective: We evaluated the late process of VC after UL in rats and examined the effects of thioperamide (H3 antagonist) on VC. Materials and methods: MK801 (NMDA antagonist)-induced Fos-like immunoreactive (-LIR) neurons in contra-MVe, which had been suppressed by NMDA-mediated cerebellar inhibition in UL-rats was used as an index. Results: The number of MK801-induced Fos-LIR neurons in contra-MVe gradually decreased to the same level as that of sham-operated rats 14 days after UL. Thioperamide moved the disappearance of the MK801-induced Fos-LIR neurons 2 days earlier. The number of MK801-induced Fos-LIR neurons in thioperamide-treated rats was significantly decreased, compared with that of vehicle-rats on days 7 and 12 after UL. But, thioperamide did not influence the decline of SN frequency in UL-rats. Conclusion: There findings suggested that the number of MK801-induced Fos-LIR neurons in contra-MVe was decreased in concordance with the restoration of ipsi-MVe-activity during the late process of VC after UL and that thioperamide accelerated the late, but not the initial process of VC

The Japanese space gravitational wave antenna; DECIGO

DECi-hertz Interferometer Gravitational wave Observatory (DECIGO) is the future Japanese space gravitational wave antenna. DECIGO is expected to open a new window of observation for gravitational wave astronomy especially between 0.1 Hz and 10 Hz, revealing various mysteries of the universe such as dark energy, formation mechanism of supermassive black holes, and inflation of the universe. The pre-conceptual design of DECIGO consists of three drag-free spacecraft, whose relative displacements are measured by a differential Fabry– Perot Michelson interferometer. We plan to launch two missions, DECIGO pathfinder and pre- DECIGO first and finally DECIGO in 2024

DECIGO pathfinder

DECIGO pathfinder (DPF) is a milestone satellite mission for DECIGO (DECi-hertz Interferometer Gravitational wave Observatory) which is a future space gravitational wave antenna. DECIGO is expected to provide us fruitful insights into the universe, in particular about dark energy, a formation mechanism of supermassive black holes, and the inflation of the universe. Since DECIGO will be an extremely large mission which will formed by three drag-free spacecraft with 1000m separation, it is significant to gain the technical feasibility of DECIGO before its planned launch in 2024. Thus, we are planning to launch two milestone missions: DPF and pre-DECIGO. The conceptual design and current status of the first milestone mission, DPF, are reviewed in this article