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Neuropharmacological properties of electrophysiologically identified, visually responsive neurones of the posterior lateral suprasylvian area

A microiontophoretic study

Summary

Extracellular recordings have been made from 118 electrophysiologically identified neurones lying in the posterior lateral suprasylvian area (PLLS and PLMS) of cats anaesthetized with Nembutal. Eighty-one cells were activated synaptically by the electrical stimulation of cortical and subcortical sites known to be the sources of monosynaptic projections to the lateral suprasylvian area; latencies to such activations have been measured. The locations and sizes of the receptive fields of 55 neurones were determined. The direction sensitivity and ocularity of these cells also were examined.

The effects of various pharmacological agonists and antagonists have been observed on visual responsiveness and synaptic excitability. The excitatory effects of subcortical (dorsal lateral geniculate nucleus and pulvinar nuclear complex) electrical stimulation on the activity of suprasylvian neurones were reduced substantially by the iontophoretic administration of atropine. Antagonists of the receptors for the excitatory amino acids reduced the effectiveness, on the single cell evoked activity, of stimulation of the ipsilateral 17/18 border region and contralateral homotopic lateral suprasylvian area. Both classes of antagonist reduced the magnitude of neuronal responses to photic stimulation, and these response attenuations were additive when the antagonists were ejected concurrently. All of the pharmacological effects were reversible and reproducible. These data lend support to the proposition that acetylcholine and an excitatory amino acid are mediators of synaptic transmission of cortical visual processes in the lateral suprasylvian area.

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Correspondence to T. P. Hicks.

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Hicks, T.P., Guedes, R.C.A. Neuropharmacological properties of electrophysiologically identified, visually responsive neurones of the posterior lateral suprasylvian area. Exp Brain Res 49, 157–173 (1983). https://doi.org/10.1007/BF00238576

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Key words

  • Posterior lateral suprasylvian area
  • Receptive fields
  • Synaptic transmission
  • Cholinergic antagonists
  • Amino acid antagonists
  • Cat