Peripheral somatic activation and spontaneous firing patterns of neurons in the periaqueductal gray of the cat |
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Authors: | Hiroshi Nakahama Keisetsu Shima Kojiro Aya Hisashi Fujii |
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Affiliation: | Division of Neurophysiology, Institute of Brain Diseases, Tohoku University School of Medicine, 1-1 Seiryo-cho, Sendai Japan |
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Abstract: | A total of 50 neurons in the periaqueductal gray (PAG) of the cat were studied. Sixty percent of the units were excited by nociceptive pinch stimulation. These units were also excited by non-nociceptive stimulation such as tapping, hair movement and/or joint rotation. Non-nociceptive stimulation excited 20% of the units, whereas nociceptive stimulation did not drive these units. Their receptive fields were large, and often encompassed the entire body. Spontanous discharges of PAG neurons revealed great irregularity. |
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Keywords: | Present address for all correspondence and reprint requests: Physiologisches Institut Universität Kiel Olshausenstr. 40–60 2300 Kiel F.R.G. |
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