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Spatial organization of receptive fields of cat's.Hippocampal visually driven neurones

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Harutiunian-Kozak B. A., Hekimian A. A., Kazarian A. L., Kozak A. J., Dec K.
Acta Neurobiologiae Experimentalis
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1996
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vol. 56
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issue 4
873-880
EN
According to the spatial configurations of receptive fields two broad groups of neurones in dorsal hippocampal region (HR) were distinguished. The receptive field borders of 22 cells have regular (R) smooth contours (squares or rectangles), usually with a horizontally oriented longitudinal axis. The second group was composed of neurones (20 cells) with irregular (IR) configurations of receptive fields. Some neurones (16 cells) of this group had relatively simple spatial configurations of receptive fields and 4 neurones had receptive fields with more intricate spatial configurations which formed complex geometrical shapes in the visual field. The exploration of the distribution of response properties a to stationary flashing spot over the RF surface revealed that the majority of cells with regular receptive fields have heterogeneous stationary structure with ON, ON-OFF and OFF subregions sequentially located in the receptive field, and these neurones, as a rule, were direction-sensitive. The neurones with irregular receptive fields, on the other hand, had a rather homogeneous structure of RFs when tested by a stationary flashing spot and only four neurones of 20 investigated were directionally sensitive.
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Responses of cat's dorsal hippocampal neurones to moving visual stimuli

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Kazarian A. L., Hekimian A. A., Haratiunian-Kozak B. A., Kozak J. A., Markarian T. M.
Acta Neurobiologiae Experimentalis
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1995
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vol. 55
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issue 2
99-107
EN
Response properties of visually driven neurones in the cat's hippocampal region were investigated.Out of 688 single cells observed 181 (26%) were visually driven.Ocular dominance was determined for 147 of those cells, 90 of which were driven only by the contralateral eye, 20 were driven exclusively by ipsilateral eye and 37 neurones could be activated by both eyes.Receptive field boundaries were outlined for 157; 152 of those neurones were movement-sensitive, and 125 neurones were sensitive to stationary stimuli.A small group of neurones (13%) showed more pronounced reactions to the vertical direction of motion.Some neurones (22%) revealed sensitivity to shape and size of the applied visual stimuli.These results confirmed earlier possess complex properties.They are probably involved in a higher level of visual information processing.
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