JN Journal of Neurophysiology
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J Neurophysiol 88: 2152-2156, 2002;
0022-3077/02 $5.00
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The Journal of Neurophysiology Vol. 88 No. 4 October 2002, pp. 2152-2156
Copyright ©2002 by the American Physiological Society

RAPID COMMUNICATION

Differential Distribution of Burst and Single-Spike Responses in Auditory Thalamus

Jufang He1 and Bin Hu2

 1Department of Rehabilitation Sciences, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong; and  2Neurosciences, Ottawa Health Research Institute, Ottawa Hospital and University of Ottawa, Ottawa, Ontario K1Y 4E9 Canada

He, Jufang and Bin Hu. Differential Distribution of Burst and Single-Spike Responses in Auditory Thalamus. J. Neurophysiol. 88: 2152-2156, 2002. The medial geniculate body (MGB) of the auditory thalamus comprises lemniscal and nonlemniscal neurons that project to the primary auditory cortex and limbic structures, respectively. Here we show that in anesthetized guinea pigs, MGB responses to a noise-burst stimulus exhibit distinct and synaptic pathway-specific firing patterns. The majority of nonlemniscal MGB cells exhibited bursting responses, whereas lemniscal neurons discharged mainly single or spike doublets. The burst firing is delayed in nonlemniscal neurons and exhibited several features that are characteristics of those mediated by low-threshold Ca2+ spikes. Such a synaptic pathway-specific allocation of bursting and single-spike firing patterns is consistent with the notion of parallel processing of auditory information in thalamocortical system.




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