Naohisa Fukuda
Kyoto University
Network
Latest external collaboration on country level. Dive into details by clicking on the dots.
Publication
Featured researches published by Naohisa Fukuda.
Brain Research | 1968
Shuji Takaori; Masashi Sasa; Naohisa Fukuda
Summary Responses of neurons in the posterior hypothalamus to electrical stimulation of the inferior alveolar nerve and distension of the stomach with cold and warm water were studied in encephale isolepreparations of cats. The mean firing rate of spontaneous unit discharges of the hypothalamic neurons was6.2 ± 2.9 (S.E.)/sec. About half of the units showed the pattern of exponential distribution, and the other half exhibited the distribution with 2–4 modes, gamma distribution atλ = 2, and rectangular distribution. More than half of the hypothalamic neurons responded to electrical stimulation of the inferior alveolar nerve at 20 c/sec in frequency, and the increased response dominated in the responsive neurons. The decreased response and biphasic responde were also found. Most of the units responsive to the somatosensory stimulation responded to the intragastric infusion of cold water but not warm water. The interval histogram of unit discharges was also modified by the infusion of cold water. It is concluded that the posterior hypothalamic neurons respond nonspecifically to afferent forms of stimulation.
Acta Oto-laryngologica | 1971
Izuru Matsuoka; Naohisa Fukuda; Shuji Takaori; Masanori Morimoto
Responses of unitary discharges of the vestibular nuclei to lateral tilt and caloric stimulation were studied in the unanesthetized encephale isole preparations of intact and hemilabyrinthectomized cats. The responses of firing rate of 93 units to lateral tilt were classified into 5 groups: increased type. (increase with lateral tilt to either or both directions), decreased type (decrease with lateral tilt to either or both directions), reversed type-I (increase with ipsilateral and decrease with contralateral tilt), reversed type-II (decrease with ipsilateral and increase with contralateral tilt), and refractory type (refractory with lateral tilt to both directions). The most dominant pattern of the responses to lateral tilt was the decreased type (60.2%). On the other hand, more than half of the vestibular units (61.3%) showed reverse changes in frequency to caloric stimulation with cold and warm water. Two main types of units were localized in the vestibular nuclei: one increased the frequency in respo...
Neuropharmacology | 1968
Shuji Takaori; Yoshihisa Nakai; Izuru Matsuoka; Masashi Sasa; Naohisa Fukuda; Kiro Shimamoto
Abstract Effects of apomorphine and metoclopramide were studied on the spontaneous unit discharges in the single neurons of nuclear structures of brainstem in the ence´phale isole´preparations of cats. Apomorphine increased significantly the spontaneous discharge frequencies of single neurons in the Nucleus tractus solitarii, but did not influence the frequencies in the Nucleus vestibularis lateralis and Nucleus sensorius superior n. trigemini and the number of spikes per volley in the inspiratory unit discharges. Metoclopramide decreased significantly the firing rate of unit discharges in the Nucleus tractus solitarii and Nucleus vestibularis lateralis, while the unit discharges of the Nucleus sensorius superior n. trigemini and the rhythmic unit discharges corresponding to inspiration were not modified by metoclopramide. The acceleration of spontaneous discharge frequencies of the Nucleus tractus solitarii induced by apomorphine was completely blocked by the supplement of metoclopramide. Metoclopramide prevented retching and vomiting elicited by electrical stimulation of the Nucleus tractus solitarii. In some animals, metoclopramide produced a transient alert pattern in the cortical and hippocampal EEG and depressed slightly the recruiting response. However, it did not affect the reticular arousal response and the evoked click potentials in the auditory cortex.
Folia Pharmacologica Japonica | 1979
Naohisa Fukuda; Masaomi Miyamoto; Shigehiko Narumi; Yasuo Nagai; Takashi Shima; Yuji Nagawa
Japanese Journal of Pharmacology | 1969
Masashi Sasa; Naohisa Fukuda; Shuji Takaori
Folia Pharmacologica Japonica | 1984
Yomei Take; Naoki Yamazaki; Naohisa Fukuda; Yoshiaki Saji; Yuji Nagawa
Japanese Journal of Pharmacology | 1970
Shuji Takaori; Naohisa Fukuda; Yasuko Amano
Japanese Journal of Pharmacology | 1974
Naohisa Fukuda; Yoshiaki Saji; Yuji Nagawa
Japanese Journal of Pharmacology | 1969
Noboru Toda; Naohisa Fukuda; Kiro Shimamoto
Neuroscience Research Supplements | 1986
Tadatoshi Hashimoto; Naohisa Fukuda; Yoshiaki Saji; Yuji Nagawa