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    Visual evoked potentials to a faint light: Signal propagation analyzed with peak latency and topographic map**

    Accurate localization for the process of recognition of a light stimulus is yet to be determined. We studied 19-channel VEP from nine healthy volunteers, evoked by physiologically faint light less than 200 Cd/m2,...

    Dr. Ichiro Shimoyama, Kenichi Uemura, Yukitomo Morita, Fumiko Miyanaga… in Brain Topography (1996)

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    Article

    Statistical analysis of short-latency flash visual evoked cortical potentials with noncephalic reference

    Most of the reports on visual evoked cortical potentials have dealt with peak latency or amplitude. An early negative deflection at about 20 ms, however, was reported to coincide with the initial signal to the...

    Ichiro Shimoyama, Fumiko Miyanaga, Shigeru Nishizawa… in Documenta Ophthalmologica (1995)

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    Spectral sensitivity and mechanism of interaction between inhibitory and excitatory responses of photosensory pineal neurons

    The characteristics and distribution of chromatic-type neurons in the photosensory pineal organ of the river lamprey, Lampetra japonica, were investigated electrophysiologically. Neuronal activity was inhibited b...

    Katsuhisa Uchida, Yukitomo Morita in Pflügers Archiv (1994)

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    Article

    Verbal versus non-verbal visual evoked potentials: Kanji versus line drawings

    Cortical areas related to perception of verbal and non-verbal stimuli were studied using VEPs. Kanji characters, line drawings (LD), or a blank were displayed. Verbal VEPs were obtained by subtracting the blan...

    Ichiro Shimoyama, Yukitomo Morita, Kenichi Uemura, Yoshiji Kojima… in Brain Topography (1992)

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    Article

    Pineal-dependent locomotor activity of lamprey, Lampetra japonica, measured in relation to LD cycle and circadian rhythmicity

    Locomotor activity of the river lamprey, Lampetra japonica, was investigated under a light-dark (LD 12∶12) cycle and under continuous dark conditions. Intact lampreys were entrained to the light:dark cycle. They ...

    Yukitomo Morita, Mitsuo Tabata, Katsuhisa Uchida… in Journal of Comparative Physiology A (1992)

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    Article

    Photoreception in pineal organs of larval and adult lampreys,Lampetra japonica

    A comparative study of the larval and adult pineal organs, which are sensitive to incident light, was carried out in the river lampreyLampetra japonica, using intracellular recording from the pineal photoreceptor...

    Satoshi Tamotsu, Yukitomo Morita in Journal of Comparative Physiology A (1986)

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    Article

    Entladungsmuster pinealer Neurone der Regenbogenforelle (Salmo irideus) bei Belichtung des Zwischenhirns

    Maintained activity in the absence of light was recorded from the exposed pineal organ (Epiphysis cerebri) of the rainbow trout (Salmo irideus) by means of microelectrodes. Inhibitory responses to light were obta...

    Yukitomo Morita in Pflüger's Archiv für die gesamte Physiologie des Menschen und der Tiere (1966)

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    Article

    Extra- und intracelluläre Abteilungen einzelner Elemente des lichtempfindlichen Zwischenhirns anurer Amphibien

    An zwölf Arten verschiedener Anuren-Familien (Bufo, Discoglossus, Hyla, Pelobates, Rana) wird ohne Ausnahme eine direkte Lichtempfindlichkeit des Zwischenhirns festgestellt, die nach Entfernung der lateralen Auge...

    Yukitomo Morita in Pflüger's Archiv für die gesamte Physiologie des Menschen und der Tiere (1965)