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Phasic stimulation of the locus coeruleus: effects on activity in the lateral geniculate nucleus

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Abstract

Neurons in the locus coeruleus (LC) encode information related to behavioral state in a tonic pattern of firing and information related to the occurrence of a sensory stimulus in a phasic pattern of firing. The effects of phasic stimulation of the LC (6 pulses at 30 Hz), designed to approximate its physiological activation by sensory stimuli, were studied in the lateral geniculate nucleus (LGN) of anesthetized rats. Phasic stimulation of the LC significantly increased neuronal firing in the LGN with a mean latency 320 ms from onset of stimulation. Receiver operating characteristic analyses on a trial-by-trial basis showed that phasic LC stimulation can result in a highly discriminable signal in the LGN. This increased neuronal firing rate in the LGN was specific for the site of stimulation and was reduced by the norepinephrine synthesis inhibitor α-methyl-p-tyrosine and by intravenous WB-4101 (α1-receptor antagonist). Neurons in the LGN have a single-spike firing mode when sensory information is faithfully relayed from retina to cortex and a burst-firing mode when the transfer of this information is degraded. Phasic LC stimulation reduced burst firing (2–5 ms interspike intervals, ISIs) at low frequencies (≤4 Hz) in the LGN, and for some neurons there was an absolute decrease in burst-like ISIs after LC stimulation, despite an increase in mean firing rate.

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Authors and Affiliations

  1. Department of Biology, Hong Kong University of Science and Technology, Clearwater Bay, Kowloon, Hong Kong

    Robert N. Holdefer

  2. Program in Neuroscience, Green Hall, Princeton University, Princeton, N. J., USA

    Barry L. Jacobs

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  1. Robert N. Holdefer
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  2. Barry L. Jacobs
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Holdefer, R.N., Jacobs, B.L. Phasic stimulation of the locus coeruleus: effects on activity in the lateral geniculate nucleus. Exp Brain Res 79, 444–452 (1994). https://doi.org/10.1007/BF00229184

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  • DOI: https://doi.org/10.1007/BF00229184

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