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Sensory responses of intralaminar thalamic neurons activated by the superior colliculus

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Summary

The intralaminar thalamus of anesthetized rats was explored for neurons activated by stimulation of the superior colliculus and responsive to sensory inputs. Neurons activated by stimulation of the intermediate and deep collicular layers were distributed throughout the intralaminar thalamus. Approximately one half of them responded to tectal as well as sensory inputs. The majority were nociceptive or had a more complex response pattern including responses to auditory stimulation. A smaller population of low threshold units had contralateral orofacial receptive fields and responded to light taps; these units were preferentially localized anteriorly in the central lateral and paracentral nuclei. Neurons responsive to tectal and sensory stimulation were randomly intermingled with other neurons which had no detectable sensory input. The results indicate that ascending projection neurons of the intermediate and deep layers of the superior colliculus provide an input to functionally diverse subpopulations of intralaminar thalamic neurons. In view of its projections to motor cortex and basal ganglia, the intralaminar thalamus appears directly implicated in basal ganglia and superior colliculus related mechanisms of attention, arousal and postural orienting.

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  1. Department of Neuroscience and Cell Biology, University of Medicine and Dentistry of New Jersey, Robert Wood Johnson Medical School, 08854, Piscataway, NJ, USA

    Barry S. Grunwerg & George M. Krauthamer

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  1. Barry S. Grunwerg
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Grunwerg, B.S., Krauthamer, G.M. Sensory responses of intralaminar thalamic neurons activated by the superior colliculus. Exp Brain Res 88, 541–550 (1992). https://doi.org/10.1007/BF00228183

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