Abstract
1. (1) Unilateral lesions rostral to thalamic recruiting sites altered, attenuated, or abolished cortical recruiting, bilaterally. Lesions involving n. reticularis and n. ventralis anterior were most effective in abolishing recruiting responses, while more rostral lesions including n. caudatus and n. prothalamicus either raised the threshold or delayed the development of recruiting. 2. (2) Desynchronization produced by high frequency stimulation of the same sites in the thalamus was not affected by such rostrally placed lesions, but was abolished by lesions caudal to the site of stimulation, at the level of the posterior commissure. 3. (3) The results indicate that pathways mediating recruiting responses (low frequency stimulation) and those subserving desynchronization (high frequency stimulation) are different; the former course rostrally, and the latter caudally, apparently via the mesencephalic reticular formation.
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