Effect of frontal ablation upon conditioned responses.

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Abstract
Frontal cortical ablation in cats abolished [conditioned response] CRs established to electrical stimulation of structures of the reticular system, although CRs were reacquired with additional training with [conditioned stimulus] CSs of higher intensities. CRs established to stimulation of other subcortical structures or a tone CS remained intact. There was very rapid transfer of CRs between structures of the reticular system and the basal forebrain area, even though cats fell asleep while making CRs to basal forebrain stimulation. Conditioning threshold shifts showed a decreased sensitivity of reticular structure and increased sensitivity of the basal forebrain, but no changes for other placements.

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