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HIPPOCAMPUS 8:475490 (1998) Discharge Correlates of Hippocampus Complex Spike Neurons in Behaving Rats Passively Displaced on a Mobile Robot Vladimir V. Gavrilo, Sidney I. Wiener, * and Alain Berth

The experiments were performed on isolated neurons from the hippocampus complex (HC). In a behavioral study, the animals were subjected to one, three, four, and six sessions in which they were individually isolated in a cylinder, with or without the application of a motor stimulus, each day for seven consecutive days. It was shown that in the three isolated rats we obtained a total of 18 individual actions, i.e., 18 action potentials (n=6), which represented a random distribution throughout the whole hippocampus, i.e. the area enclosed by the HC and surrounded by the entorhinal cortex. It was further shown that the spontaneous firing of a single or a few these units increased, and decreased, during a week of passive accommodation, depending on day by day the animals were allowed to adjust their position to the cylinder (six mice in all, n=6 for each treatment). The results are in general agreement with previous studies reported here and by other laboratories. CONCLUSIONS: These behavioral experiments demonstrate that the spontaneous firing of isolated HC neurons increases when the animals are displaced into a position on a mechanical probe, when they are able to adjust themselves to the apparatus in an automatic/programmatic way, and when the positions of their paws in the cylinder resemble those on a static mobile robot. This indicates that at least part of these neurons may be involved in the control of sensorimotor processes. Moreover, because the firing of all these units increased and decreased with the number of days during which the same animals were moved passively, it was proposed that the neuronal activity in these HC neurons was modulated by the duration of the adaptation (delta period). We conclude that some neurons in the hippocampus are active in the absence of the body movements or by the direct application of mechanical force and that their firing and the location and the direction of their firing may be modulated by motor control (motion) and also by the sensory input. Citation: Chaudhrière A, Gavrilo V, Wiener S, Berth O, Gautier B, et al. (2010) Motion-Controlled Hippocampus Cells. Los One 5(9): e8015. Editor: David C.

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