Earthworm individualities when facing a conflict between turn alternation and aversive learning

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    • Sakamoto Kazuhiro
    • Department of Physiology, Tohoku University School of Medicine|Department of Neuroscience, Faculty of Medicine, Tohoku Medical and Pharmaceutical University


<p>An individual's personality develops through a combination of experiences and parental inheritance. When faced with a conflict, will an individual take an innate behavior or a learned one? In such situations, individuality will manifest itself. Here, we focused on turn alternation behavior, which is a habitual tendency to turn in the direction opposite the preceding turn, in earthworms (<i>Eisenia fetida</i>) and examined how this behavior is affected by an aversive stimulus. Of 10 earthworms, 3 were affected by the stimulus. Turn alternation deteriorated in two worms, one of which showed anti-turn alternation behavior, whereas the remaining worm showed an enhanced tendency toward turn alternation. Earthworms have a relatively simple nervous system. This study opens the door to investigate the neuronal basis for individuality that emerges between nature and nurture.</p>


  • Biophysics and Physicobiology

    Biophysics and Physicobiology 15(0), 159-164, 2018

    The Biophysical Society of Japan


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