Abstract
A small dose of pentobarbital administered intravenously to a chloralose-anesthetized cat rendered pericruciate wide-field neurons unresponsive to cutaneous stimulation without altering the responsiveness of small-field neurons. Under this condition, topical application of strychnine, which is known to markedly enhance the responses of small-field neurons, was found to restore the responsiveness of the wide-field neurons, but only to stimulation of the topographically focal cutaneous site. Wide-field responsiveness returned only after the effect of pentobarbital had disappeared and the cortex returned to its normal chloralose condition. This result is consistent with the idea that small-field neurons have excitatory synaptic connections with the wide-field neurons in their immediate neighborhood.
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