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Journal of Experimental Biology, Vol 147, Issue 1 1-20, Copyright © 1989 by Company of Biologists
JOURNAL ARTICLES |
T Teyke, KR Weiss and I Kupfermann
Center for Neurobiology and Behavior, Columbia University, College of Physicians and Surgeons, New York, NY 10032.
The cerebral B cluster neurones of Aplysia californica were studied under experimental conditions designed to evoke head movements in a selective fashion: either to approach an appetitive stimulus, or to withdraw from an aversive one. Intracellular recordings indicated the presence of two types of B cluster neurones: Bn cells that had fast (narrow) spikes, and Bb cells that had slow (broad) spikes. Tactile stimulation of the tentacles, rhinophores and lips excited Bn neurones, but inhibited Bb neurones. Intracellular stimulation of Bn cells evoked contractions of body wall muscles. No contractions were observed when Bb cells were fired, indicating that it is unlikely that the Bb neurones are motor neurones. Several lines of evidence indicated that the Bn type neurones are involved in withdrawal responses but not in appetitive head turning. (1) Elimination of the descending axons of the Bn cells by lesioning the cerebropleural connectives (C-Pl connectives) did not affect the head-turning response. This lesion significantly altered the head-withdrawal response by selectively eliminating an initial fast component of the withdrawal movement. (2) In chronic recordings from the C-Pl connective, unit activity was obtained which was correlated with the presentation of an appetitive stimulus rather than with evoked or spontaneous turning movements. A substantial increase in activity also occurred during head withdrawal of the animal. On the basis of these data, we postulate that separate populations of motor neurones are responsible for the aversive withdrawal of the head, and for the directed turning response towards a stimulus.
This article has been cited by other articles:
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  Y. Xin, J. Koester, J. Jing, K. R. Weiss, and I. Kupfermann Cerebral-Abdominal Interganglionic Coordinating Neurons in Aplysia J Neurophysiol, January 1, 2001; 85(1): 174 - 186. [Abstract] [Full Text] [PDF]
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Y. Xin, K. R. Weiss, and I. Kupfermann Multifunctional Neuron CC6 in Aplysia Exerts Actions Opposite to Those of Multifunctional Neuron CC5 J Neurophysiol, May 1, 2000; 83(5): 2473 - 2481. [Abstract] [Full Text] [PDF]
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S. S. Rubakhin, L. Li, T. P. Moroz, and J. V. Sweedler Characterization of the Aplysia californica Cerebral Ganglion F Cluster J Neurophysiol, March 1, 1999; 81(3): 1251 - 1260. [Abstract] [Full Text] [PDF]
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I. Hurwitz, R. Perrins, Y. Xin, K. R. Weiss, and I. Kupfermann C-PR Neuron of Aplysia Has Differential Effects on "Feeding" Cerebral Interneurons, Including Myomodulin-Positive CBI-12 J Neurophysiol, February 1, 1999; 81(2): 521 - 534. [Abstract] [Full Text] [PDF]
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 G. A. Phares and P. E. Lloyd Immunocytological and Biochemical Localization and Biological Activity of the Newly Sequenced Cerebral Peptide 2 in Aplysia J. Neurosci., December 15, 1996; 16(24): 7841 - 7852. [Abstract] [Full Text] [PDF]
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Y. Xin, K. R. Weiss, and I. Kupfermann A Pair of Identified Interneurons in Aplysia that Are Involved in Multiple Behaviors Are Necessary and Sufficient for the Arterial-Shortening Component of a Local Withdrawal Reflex J. Neurosci., July 15, 1996; 16(14): 4518 - 4528. [Abstract] [Full Text] [PDF]
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